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Unknow object in STEREO HI1a

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  • algwat
    Gidday all, After my last noise call i m a bit reluctant to post this. It is visible across the complete sequence. Open to opinions An interesting object
    Message 1 of 25 , Jan 13, 2009
      Gidday all,
      After my last noise call i'm a bit reluctant to post this.
      It is visible across the complete sequence. Open to opinions

      An interesting object moving north and west in Hi1a.

      (0,0) upleft image pixvalue x y slice.
      13 H1a:20090110_212901_s4h1A 23.6008 965 213 30
      14 H1a:20090110_140901_s4h1A 15.0997 964 220 19
      15 H1a:20090110_084901_s4h1A 26.7208 964 227 11
      16 H1a:20090110_012901_s4h1A 11.5326 966 237 3

      kind regards,
      Alan Watson

      Http://cometal.bigblog.com.au/index.do
    • algwat
      Gidday all, these are the positions i get from SAO DS9. rgds alan # Region file format: DS9 version 4.1 # Filename:
      Message 2 of 25 , Jan 13, 2009
        Gidday all,
        these are the positions i get from SAO DS9. rgds alan

        # Region file format: DS9 version 4.1
        # Filename: C:/ccc/HI1a-nongroup/20090110_192901_s4h1A.fits
        global color=green dashlist=8 3 width=1 font="helvetica 10 normal"
        select=1 highlite=1

        dash=0 fixed=0 edit=1 move=1 delete=1 include=1 source=1
        wcsa;fk5
        circle(22:30:51.100,-02:54:46.90,359.191")

        # Region file format: DS9 version 4.1
        # Filename: C:/ccc/HI1a-nongroup/20090110_152901_s4h1A.fits
        global color=green dashlist=8 3 width=1 font="helvetica 10 normal"
        select=1 highlite=1

        dash=0 fixed=0 edit=1 move=1 delete=1 include=1 source=1
        wcsa;fk5
        circle(22:30:25.252,-03:03:57.58,359.191")

        # Region file format: DS9 version 4.1
        # Filename: C:/ccc/HI1a-nongroup/20090110_120901_s4h1A.fits
        global color=green dashlist=8 3 width=1 font="helvetica 10 normal"
        select=1 highlite=1

        dash=0 fixed=0 edit=1 move=1 delete=1 include=1 source=1
        wcsa;fk5
        circle(22:29:54.266,-03:10:50.18,359.191")

        # Region file format: DS9 version 4.1
        # Filename: C:/ccc/HI1a-nongroup/20090110_084901_s4h1A.fits
        global color=green dashlist=8 3 width=1 font="helvetica 10 normal"
        select=1 highlite=1

        dash=0 fixed=0 edit=1 move=1 delete=1 include=1 source=1
        wcsa;fk5
        circle(22:29:35.212,-03:19:39.52,359.191")

        --- In stereohunter@yahoogroups.com, "algwat" <awat4309@...> wrote:
        >
        > Gidday all,
        > After my last noise call i'm a bit reluctant to post this.
        > It is visible across the complete sequence. Open to opinions
        >
        > An interesting object moving north and west in Hi1a.
        >
        > (0,0) upleft image pixvalue x y slice.
        > 13 H1a:20090110_212901_s4h1A 23.6008 965 213 30
        > 14 H1a:20090110_140901_s4h1A 15.0997 964 220 19
        > 15 H1a:20090110_084901_s4h1A 26.7208 964 227 11
        > 16 H1a:20090110_012901_s4h1A 11.5326 966 237 3
        >
        > kind regards,
        > Alan Watson
        >
        > Http://cometal.bigblog.com.au/index.do
        >
      • Alan Watson
        Gidday All, I tried this MPChecker/CMTChecker/NEOChecker/NEOCMTChecker with these positions. 135P/Shoemaker-Levy pops up. Not sure i have done this
        Message 3 of 25 , Jan 13, 2009

          Gidday All,

          I tried this MPChecker/CMTChecker/NEOChecker/NEOCMTChecker with these positions.

          135P/Shoemaker-Levy   pops up.   Not sure i have done this correctly. regards, Alan

          The following objects, brighter than V = 20.0, were found in the 150.0-arcminute region around R.A. = 22 30 51.10, Decl. = -02 54 46.9 (J2000.0) on 2009 01 13.82 UT:

           Object designation         R.A.      Decl.     V       Offsets     Motion/hr   Orbit  Further observations?
                                     h  m  s     °  '  "        R.A.   Decl.  R.A.  Decl.        Comment (Elong/Decl/V at date 1)
          
            (6456) Golombek        22 35 52.6 -03 34 39  19.7  75.3E  39.9S   103+    45+   12o  NEO : Desirable between 2009 Jan. 13-Feb. 12.  At the first date, object will be within 60 deg of the sun.
            (5836) 1993 MF         22 25 42.5 -05 00 22  17.1  77.1W 125.6S   134+    45+   14o  NEO : Desirable between 2009 Jan. 13-Feb. 12.  At the first date, object will be within 60 deg of the sun.
           135P/Shoemaker-Levy     22 30 09.3 -05 23 14        10.4W 148.5S    37+    12+  .5 o  (r =   3.92 AU)
           
          ----- Original Message -----
          From: algwat
          Sent: Wednesday, January 14, 2009 6:40 AM
          Subject: [stereohunter] Re: Unknow object in STEREO HI1a

          Gidday all,
          these are the positions i get from SAO DS9. rgds alan

          # Region file format: DS9 version 4.1
          # Filename: C:/ccc/HI1a- nongroup/ 20090110_ 192901_s4h1A. fits
          global color=green dashlist=8 3 width=1 font="helvetica 10 normal"
          select=1 highlite=1

          dash=0 fixed=0 edit=1 move=1 delete=1 include=1 source=1
          wcsa;fk5
          circle(22:30: 51.100,-02: 54:46.90, 359.191")

          # Region file format: DS9 version 4.1
          # Filename: C:/ccc/HI1a- nongroup/ 20090110_ 152901_s4h1A. fits
          global color=green dashlist=8 3 width=1 font="helvetica 10 normal"
          select=1 highlite=1

          dash=0 fixed=0 edit=1 move=1 delete=1 include=1 source=1
          wcsa;fk5
          circle(22:30: 25.252,-03: 03:57.58, 359.191")

          # Region file format: DS9 version 4.1
          # Filename: C:/ccc/HI1a- nongroup/ 20090110_ 120901_s4h1A. fits
          global color=green dashlist=8 3 width=1 font="helvetica 10 normal"
          select=1 highlite=1

          dash=0 fixed=0 edit=1 move=1 delete=1 include=1 source=1
          wcsa;fk5
          circle(22:29: 54.266,-03: 10:50.18, 359.191")

          # Region file format: DS9 version 4.1
          # Filename: C:/ccc/HI1a- nongroup/ 20090110_ 084901_s4h1A. fits
          global color=green dashlist=8 3 width=1 font="helvetica 10 normal"
          select=1 highlite=1

          dash=0 fixed=0 edit=1 move=1 delete=1 include=1 source=1
          wcsa;fk5
          circle(22:29: 35.212,-03: 19:39.52, 359.191")

          --- In stereohunter@ yahoogroups. com, "algwat" <awat4309@.. .> wrote:
          >
          > Gidday all,
          > After my last noise call i'm a bit reluctant to post this.
          > It is visible across the complete sequence. Open to opinions
          >
          > An interesting object moving north and west in Hi1a.
          >
          > (0,0) upleft image pixvalue x y slice.
          > 13 H1a:20090110_ 212901_s4h1A 23.6008 965 213 30
          > 14 H1a:20090110_ 140901_s4h1A 15.0997 964 220 19
          > 15 H1a:20090110_ 084901_s4h1A 26.7208 964 227 11
          > 16 H1a:20090110_ 012901_s4h1A 11.5326 966 237 3
          >
          > kind regards,
          > Alan Watson
          >
          > Http://cometal. bigblog.com. au/index. do
          >

        • Dimitry Chestnov
          ... these positions. ... Alan, NEOChecker does not work with space observatories as observing sites, even if you entered appropriate observatory code. The
          Message 4 of 25 , Jan 13, 2009
            --- In stereohunter@yahoogroups.com, "Alan Watson" <awat4309@...>
            wrote:
            >
            > Gidday All,
            >
            > I tried this MPChecker/CMTChecker/NEOChecker/NEOCMTChecker with
            these positions.
            >

            Alan,

            NEOChecker does not work with space observatories as observing sites,
            even if you entered appropriate observatory code.

            The object's movement speed and direction are different from 135P. It
            is also very bright and very far from 135P, which orbit is well-
            determined.

            Dimitry
          • Michael Jaeger
            Hallo Alan With a perihel time around feb 6 85 P is near this point. best regards Michael ... From: Alan Watson To: stereohunter@yahoogroups.com Sent:
            Message 5 of 25 , Jan 13, 2009
              Hallo Alan
               
              With a perihel time around  feb 6  85 P is near this point.
               
              best regards
              Michael
               
               
              ----- Original Message -----
              Sent: Tuesday, January 13, 2009 9:01 PM
              Subject: Re: [stereohunter] Re: Unknow object in STEREO HI1a

              Gidday All,

              I tried this MPChecker/CMTChecke r/NEOChecker/ NEOCMTChecker with these positions.

              135P/Shoemaker- Levy   pops up.   Not sure i have done this correctly. regards, Alan

              The following objects, brighter than V = 20.0, were found in the 150.0-arcminute region around R.A. = 22 30 51.10, Decl. = -02 54 46.9 (J2000.0) on 2009 01 13.82 UT:

               Object designation         R.A.      Decl.     V       Offsets     Motion/hr   Orbit  Further observations?
                                         h  m  s     °  '  "        R.A.   Decl.  R.A.  Decl.        Comment (Elong/Decl/ V at date 1)
              
                (6456) Golombek        22 35 52.6 -03 34 39  19.7  75.3E  39.9S   103+    45+   12o  NEO : Desirable between 2009 Jan. 13-Feb. 12.  At the first date, object will be within 60 deg of the sun.
                (5836) 1993 MF         22 25 42.5 -05 00 22  17.1  77.1W 125.6S   134+    45+   14o  NEO : Desirable between 2009 Jan. 13-Feb. 12.  At the first date, object will be within 60 deg of the sun.
               135P/Shoemaker- Levy     22 30 09.3 -05 23 14        10.4W 148.5S    37+    12+  .5 o  (r =   3.92 AU)
               
              ----- Original Message -----
              From: algwat
              Sent: Wednesday, January 14, 2009 6:40 AM
              Subject: [stereohunter] Re: Unknow object in STEREO HI1a

              Gidday all,
              these are the positions i get from SAO DS9. rgds alan

              # Region file format: DS9 version 4.1
              # Filename: C:/ccc/HI1a- nongroup/ 20090110_ 192901_s4h1A. fits
              global color=green dashlist=8 3 width=1 font="helvetica 10 normal"
              select=1 highlite=1

              dash=0 fixed=0 edit=1 move=1 delete=1 include=1 source=1
              wcsa;fk5
              circle(22:30: 51.100,-02: 54:46.90, 359.191")

              # Region file format: DS9 version 4.1
              # Filename: C:/ccc/HI1a- nongroup/ 20090110_ 152901_s4h1A. fits
              global color=green dashlist=8 3 width=1 font="helvetica 10 normal"
              select=1 highlite=1

              dash=0 fixed=0 edit=1 move=1 delete=1 include=1 source=1
              wcsa;fk5
              circle(22:30: 25.252,-03: 03:57.58, 359.191")

              # Region file format: DS9 version 4.1
              # Filename: C:/ccc/HI1a- nongroup/ 20090110_ 120901_s4h1A. fits
              global color=green dashlist=8 3 width=1 font="helvetica 10 normal"
              select=1 highlite=1

              dash=0 fixed=0 edit=1 move=1 delete=1 include=1 source=1
              wcsa;fk5
              circle(22:29: 54.266,-03: 10:50.18, 359.191")

              # Region file format: DS9 version 4.1
              # Filename: C:/ccc/HI1a- nongroup/ 20090110_ 084901_s4h1A. fits
              global color=green dashlist=8 3 width=1 font="helvetica 10 normal"
              select=1 highlite=1

              dash=0 fixed=0 edit=1 move=1 delete=1 include=1 source=1
              wcsa;fk5
              circle(22:29: 35.212,-03: 19:39.52, 359.191")

              --- In stereohunter@ yahoogroups. com, "algwat" <awat4309@.. .> wrote:
              >
              > Gidday all,
              > After my last noise call i'm a bit reluctant to post this.
              > It is visible across the complete sequence. Open to opinions
              >
              > An interesting object moving north and west in Hi1a.
              >
              > (0,0) upleft image pixvalue x y slice.
              > 13 H1a:20090110_ 212901_s4h1A 23.6008 965 213 30
              > 14 H1a:20090110_ 140901_s4h1A 15.0997 964 220 19
              > 15 H1a:20090110_ 084901_s4h1A 26.7208 964 227 11
              > 16 H1a:20090110_ 012901_s4h1A 11.5326 966 237 3
              >
              > kind regards,
              > Alan Watson
              >
              > Http://cometal. bigblog.com. au/index. do
              >

            • Dimitry Chestnov
              According to Alan s astrometry, I can assume that the comet is within few hundreths of AU from spacecraft (some 0.04 AU). It is probably a very close fly-by.
              Message 6 of 25 , Jan 13, 2009
                According to Alan's astrometry, I can assume that the comet is within
                few hundreths of AU from spacecraft (some 0.04 AU). It is probably a
                very close fly-by.
              • Piotr Guzik
                Dimitry, ... How did you find that? Alan s astrometry suggest the comet is moving more or less 2.5 /hour... This is pretty similar to what is expected for 85P
                Message 7 of 25 , Jan 13, 2009
                  Dimitry,

                  > According to Alan's astrometry, I can assume that the comet is
                  > within few hundreths of AU from spacecraft (some 0.04 AU). It is
                  > probably a very close fly-by.

                  How did you find that? Alan's astrometry suggest the comet is moving
                  more or less 2.5'/hour... This is pretty similar to what is expected
                  for 85P (which should be now more than 1 AU from spacecraft).


                  Michael,

                  > With a perihel time around feb 6 85 P is near this point.

                  Didn't you mean "with a perihelion time mar 6" rather than "feb 6"?
                  I think, even then it should be about 5 degrees south from the object
                  found by Alan, however if perihelion time is shifted by about 3
                  months, maybe also other orbital parameters are different...
                  As I wrote above, the movement seems to be roughly consistent with
                  what is expected for 85P (though position angle differs by roughly 30
                  degrees, but this may be due to different orbital elements?).

                  Best Regards
                  Piotr Guzik
                • Alan Watson
                  Gidday All, The good news, it s still there. The better news is its turned a corner and is now heading south. The pixel value is getting higher. Could it be in
                  Message 8 of 25 , Jan 13, 2009
                    Gidday All,
                    The good news, it's still there.
                    The better news is its turned a corner and is now heading south.
                    The pixel value is getting higher. Could it be in STEREO Cor2B?
                     
                    So too close to the sun to be any long lost travellers? Not 85P.
                    Still not a group comet as it's moving in the wrong direction?
                     
                    Kind regards,
                        Alan Watson
                     
                     
                    Image                                      pixval  x    y   slice
                    7 H1a:20090110_152901_s4h1A 21.31 964 219 21
                    9 H1a:20090110_084901_s4h1A 26.72 964 227 11
                    6 H1a:20090110_212901_s4h1A 23.94 965 212 30
                    8 H1a:20090110_132901_s4h1A 23.04 967 222 18
                    5 H1a:20090111_040901_s4h1A 15.13 969 207 40
                    4 H1a:20090111_140901_s4h1A 25.2 976 204 55
                    3 H1a:20090111_172901_s4h1A 28.11 979 206 60
                    11 H1a:20090111_180901_s4h1A 29.26 980 207 61
                    2 H1a:20090111_204901_s4h1A 30.36 984 208 65
                    10 H1a:20090111_224901_s4h1A 31.26 987 210 68
                    1 H1a:20090111_232901_s4h1A 33.75 987 210 69

                         
                    ----- Original Message -----
                    Sent: Wednesday, January 14, 2009 11:16 AM
                    Subject: [stereohunter] Re: Unknown object in STEREO HI1a

                    Dimitry,

                    > According to Alan's astrometry, I can assume that the comet is
                    > within few hundreths of AU from spacecraft (some 0.04 AU). It is
                    > probably a very close fly-by.

                    How did you find that? Alan's astrometry suggest the comet is moving
                    more or less 2.5'/hour... This is pretty similar to what is expected
                    for 85P (which should be now more than 1 AU from spacecraft).

                    Michael,

                    > With a perihel time around feb 6 85 P is near this point.

                    Didn't you mean "with a perihelion time mar 6" rather than "feb 6"?
                    I think, even then it should be about 5 degrees south from the object
                    found by Alan, however if perihelion time is shifted by about 3
                    months, maybe also other orbital parameters are different...
                    As I wrote above, the movement seems to be roughly consistent with
                    what is expected for 85P (though position angle differs by roughly 30
                    degrees, but this may be due to different orbital elements?).

                    Best Regards
                    Piotr Guzik

                  • Dimitry Chestnov
                    ... I tried to compute an orbit from Alan s 3 positions, but the result was wrong due to small observed arch. I computed an orbit for Earth as observing site
                    Message 9 of 25 , Jan 14, 2009
                      --- In stereohunter@yahoogroups.com, "Piotr Guzik" <g22@...> wrote:
                      >
                      > How did you find that?

                      I tried to compute an orbit from Alan's 3 positions, but the result
                      was wrong due to small observed arch.

                      I computed an orbit for Earth as observing site with time
                      substituting (when Earth should be at this point).

                      Now, with observed arc of 46 hours, I can get such rough orbit:


                      Perihelion 2009 Feb 24.40 TT; Constraint: e=1

                      q 0.1185 (2000.0)
                      Peri. 111.71
                      Node 340.70
                      e 1.0 Incl. 58.33

                      Earth MOID: 0.52 Me: 0.058

                      From 7 observations 2009 Feb. 22-23; RMS error 95 arcseconds

                      If m1~9 (from STEREO-A) and G=10, then H~18.

                      The object is also in HI1B FOV and should be visible as well on its
                      images.

                      Best regards,
                      Dimitry
                    • Dimitry Chestnov
                      ... Sorry, the correct value of TP is 2009 Jan 12.41 UT. Dimitry.
                      Message 10 of 25 , Jan 14, 2009
                        --- In stereohunter@yahoogroups.com, "Dimitry Chestnov" <dirl89@...>
                        wrote:
                        >
                        > Perihelion 2009 Feb 24.40 TT; Constraint: e=1

                        Sorry, the correct value of TP is 2009 Jan 12.41 UT.

                        Dimitry.
                      • Dimitry Chestnov
                        ... It also may be visible in LASCO C3.
                        Message 11 of 25 , Jan 14, 2009
                          --- In stereohunter@yahoogroups.com, "Dimitry Chestnov" <dirl89@...>
                          wrote:
                          >
                          > The object is also in HI1B FOV and should be visible as well on its
                          > images.

                          It also may be visible in LASCO C3.
                        • Dimitry Chestnov
                          Final orbit solution: http://geminorum.narod.ru/comets/algwat_hi1a_K091A.txt Regards, Dimitry
                          Message 12 of 25 , Jan 14, 2009
                            Final orbit solution:
                            http://geminorum.narod.ru/comets/algwat_hi1a_K091A.txt

                            Regards,
                            Dimitry
                          • rainerkracht
                            ... 2009/ 1/10 JD=2454841.8743200 (ref. J2000.0) File: 2009A01.POS Equat. Pos. & Vel. Ecliptic Oscul. Elements (Gm, km/s)
                            Message 13 of 25 , Jan 14, 2009
                              --- In stereohunter@yahoogroups.com, "Dimitry Chestnov" <dirl89@...>
                              wrote:
                              >
                              > --- In stereohunter@yahoogroups.com, "Piotr Guzik" <g22@> wrote:
                              > >
                              > > How did you find that?
                              >
                              > I tried to compute an orbit from Alan's 3 positions, but the result
                              > was wrong due to small observed arch.
                              >
                              > I computed an orbit for Earth as observing site with time
                              > substituting (when Earth should be at this point).
                              >
                              > Now, with observed arc of 46 hours, I can get such rough orbit:
                              >
                              >
                              > Perihelion 2009 Feb 24.40 TT; Constraint: e=1
                              >
                              > q 0.1185 (2000.0)
                              > Peri. 111.71
                              > Node 340.70
                              > e 1.0 Incl. 58.33
                              >
                              > Earth MOID: 0.52 Me: 0.058
                              >
                              > From 7 observations 2009 Feb. 22-23; RMS error 95 arcseconds
                              >
                              > If m1~9 (from STEREO-A) and G=10, then H~18.
                              >
                              > The object is also in HI1B FOV and should be visible as well on its
                              > images.
                              >
                              > Best regards,
                              > Dimitry
                              >
                              2009/ 1/10 JD=2454841.8743200 (ref. J2000.0) File: 2009A01.POS
                              Equat. Pos. & Vel. Ecliptic Oscul. Elements
                              (Gm, km/s) (deg, AU)
                              Itr: 1 Converged s = 9.893E-03°
                              X0: 1.47224191E+01 s= 6.1E-01 Mean Anomaly: 358.33110005 s= 9.2E-
                              02
                              Y0: 7.71591032E-01 s= 2.5E-01 Arg.of Perih: 106.53073615 s=
                              1.1E+00
                              Z0: 1.68351612E+01 s= 3.1E-02 Long of Node: 340.07519395 s= 2.0E-
                              01
                              Vx0: -9.88654142E+01 s= 9.0E-01 Inclination : 51.64773445 s= 7.2E-
                              01
                              Vy0: 3.67355306E+01 s= 3.9E-01 Eccentricity: 1.00000000 s=
                              0.0E+00
                              Vz0: 2.71512574E+01 Semimaj.Axis:
                              Rj0: -2.44805E-23 DataPoints: 8 Time Span: 1.583 d
                              A1: 0.00000000E+00 M. Motion: 0.9856076686 s=
                              0.0E+00
                              A2: 0.00000000E+00 Perih Dist : 0.12588577 s= 5.9E-
                              04
                              A3: 0.00000000E+00 Perih Long : 86.60593010 s=
                              1.1E+00
                              AF: 1.11000000E-01 Period (JY):
                              Geocentric Positions Perih Time : 2454843.56759 s= 9.4E-
                              02
                              X0: 6.53482619E+01
                              Y0: -1.25955901E+02 M Main Menu
                              Z0: -3.81050265E+01 G GoTo Epoch
                              Vx0: -7.04231957E+01 R Residuals
                              Vy0: 4.62421757E+01 I Iterate
                              Vz0: 3.12714406E+01 S Set as Start
                              Rho: 2.23778379E+01 Q Quit
                            • rainerkracht
                              ... its ... It was probably too faint when it crossed LASCO C3. But HI1B should show it. With these elements: Ecliptic Osculating Elements (J2000.0) at JD
                              Message 14 of 25 , Jan 15, 2009
                                --- In stereohunter@yahoogroups.com, "Dimitry Chestnov" <dirl89@...>
                                wrote:
                                >
                                > --- In stereohunter@yahoogroups.com, "Dimitry Chestnov" <dirl89@>
                                > wrote:
                                > >
                                > > The object is also in HI1B FOV and should be visible as well on
                                its
                                > > images.
                                >
                                > It also may be visible in LASCO C3.
                                >

                                It was probably too faint when it crossed LASCO C3.
                                But HI1B should show it. With these elements:

                                Ecliptic Osculating Elements (J2000.0) at JD 2454843.500000 Date:
                                2009/01/12

                                TT : 00:00:00
                                Body e i w Node
                                q Tp-JD
                                2009A 1.00000016 51.559809 105.864288 340.053392
                                0.12622814 0.014433

                                I have for HI1B
                                2009 Jan 12 1809 15h 58m 48.2s -15d 57' 39"
                                2009 15 57 55.4 -16 03 00

                                The corresponding x,y are close to 61/270 and 74/277.

                                (The comet left HI1A on January 12 and entered HI1B on the same day,
                                with several hours in both FOVs)

                                I see nothing close to the expected positions in HI1B.
                                The orbital determination includes two positions in HI1A
                                from Jan 12 1009 (1007/226) and 1449 (1018/234).

                                Can someone confirm my Jan 12 positions in HI1A?
                                Can someone locate the comet in HI1B?

                                Rainer
                              • Alan Watson
                                Gidday Rainer and Dimitry, ... Your last Hi1a positions look good. I have loaded Rainer s orbit details into Starry night. It show the comet crossing STEREO
                                Message 15 of 25 , Jan 16, 2009
                                  Gidday Rainer and Dimitry,
                                   
                                  >Can someone confirm my Jan 12 positions in HI1A?
                                  >Can someone
                                  locate the comet in HI1B?
                                   
                                  Your last Hi1a positions look good. I have loaded Rainer's orbit details into Starry night.
                                  It show the comet crossing STEREO COr2a for the 12-16 mid upper left quarter moving right and down.
                                  Also in Hi1b from 12th, crossing mid line(X??? y512) about 15th.
                                   
                                  The pixvalues I have range from low 20's to high 30's. These approximate to a mag 12.5 - 11.5.
                                  So perhaps not that visible in Cor or C3.
                                   
                                  Tried real hard to see a reasonable mover in HI1b, but have nothing very obvious at all around the area you suggest.
                                   
                                  Thanks to you and to Dimitry for taking the time to work out the orbit data..
                                   
                                  Kind regards,
                                      Alan Watson
                                   
                                   
                                    Label                        Mean X Y Slice
                                  1 H1a:20090112_140901_s4h1A 32.83 1016 234 91
                                  2 H1a:20090112_120901_s4h1A 34.28 1012 229 88
                                  3 H1a:20090112_100901_s4h1A 31.61 1008 225 85
                                  4 H1a:20090112_072901_s4h1A 32.82 1003 221 81
                                  5 H1a:20090112_052901_s4h1A 37.16 998 217 78
                                  6 H1a:20090112_032901_s4h1A 33.05 996 215 75
                                  7 H1a:20090112_012901_s4h1A 31.89 992 212 72
                                  8 H1a:20090111_224901_s4h1A 31.26 987 210 68
                                  9 H1a:20090111_192901_s4h1A 25.48 983 207 63
                                  10 H1a:20090111_172901_s4h1A 26.72 980 207 60
                                  11 H1a:20090111_084901_s4h1A 24.37 969 205 47
                                  12 H1a:20090111_064901_s4h1A 24.66 969 207 44
                                  13 H1a:20090111_052901_s4h1A 29.38 967 205 42
                                  14 H1a:20090111_032901_s4h1A 26.8 967 208 39
                                  15 H1a:20090111_004901_s4h1A 30.84 966 209 35
                                  16 H1a:20090110_212901_s4h1A 23.79 965 211 30
                                  17 H1a:20090110_192901_s4h1A 29.26 965 213 27
                                  18 H1a:20090110_152901_s4h1A 24.37 964 218 21
                                  19 H1a:20090110_124901_s4h1A 23.02 965 221 17
                                  20 H1a:20090110_084901_s4h1A 26.72 964 227 11
                                • karlbattams
                                  All, In case you were concerned, I am not ignoring this object. This is a very hard target to follow through the images, so it took me a while to get as many
                                  Message 16 of 25 , Jan 16, 2009
                                    All,

                                    In case you were concerned, I am not ignoring this object. This is a
                                    very hard target to follow through the images, so it took me a while
                                    to get as many positions as I could. Also, the astrometry software is
                                    still a little fussy with HI-1 images, so it's taking a long time to
                                    get everything measured.

                                    So I am working on it and will try and get it done today. If not,
                                    I'll see if I can work on it from home over the weekend or
                                    Monday/Tuesday. (The Washington D.C. area is pretty crazy at the
                                    moment in preparation for the Inauguration ceremony on Tuesday. After
                                    today, I will be out-of-office until Wednesday.)

                                    Regards,
                                    ~~Karl


                                    --- In stereohunter@yahoogroups.com, "Alan Watson" <awat4309@...> wrote:
                                    >
                                    > Gidday Rainer and Dimitry,
                                    >
                                    > >Can someone confirm my Jan 12 positions in HI1A?
                                    > >Can someone locate the comet in HI1B?
                                    >
                                    > Your last Hi1a positions look good. I have loaded Rainer's orbit
                                    details into Starry night.
                                    > It show the comet crossing STEREO COr2a for the 12-16 mid upper left
                                    quarter moving right and down.
                                    > Also in Hi1b from 12th, crossing mid line(X??? y512) about 15th.
                                    >
                                    > The pixvalues I have range from low 20's to high 30's. These
                                    approximate to a mag 12.5 - 11.5.
                                    > So perhaps not that visible in Cor or C3.
                                    >
                                    > Tried real hard to see a reasonable mover in HI1b, but have nothing
                                    very obvious at all around the area you suggest.
                                    >
                                    > Thanks to you and to Dimitry for taking the time to work out the
                                    orbit data..
                                    >
                                    > Kind regards,
                                    > Alan Watson
                                    >
                                    > Http://cometal.bigblog.com.au/index.do
                                    >
                                    > Label Mean X Y Slice
                                    > 1 H1a:20090112_140901_s4h1A 32.83 1016 234 91
                                    > 2 H1a:20090112_120901_s4h1A 34.28 1012 229 88
                                    > 3 H1a:20090112_100901_s4h1A 31.61 1008 225 85
                                    > 4 H1a:20090112_072901_s4h1A 32.82 1003 221 81
                                    > 5 H1a:20090112_052901_s4h1A 37.16 998 217 78
                                    > 6 H1a:20090112_032901_s4h1A 33.05 996 215 75
                                    > 7 H1a:20090112_012901_s4h1A 31.89 992 212 72
                                    > 8 H1a:20090111_224901_s4h1A 31.26 987 210 68
                                    > 9 H1a:20090111_192901_s4h1A 25.48 983 207 63
                                    > 10 H1a:20090111_172901_s4h1A 26.72 980 207 60
                                    > 11 H1a:20090111_084901_s4h1A 24.37 969 205 47
                                    > 12 H1a:20090111_064901_s4h1A 24.66 969 207 44
                                    > 13 H1a:20090111_052901_s4h1A 29.38 967 205 42
                                    > 14 H1a:20090111_032901_s4h1A 26.8 967 208 39
                                    > 15 H1a:20090111_004901_s4h1A 30.84 966 209 35
                                    > 16 H1a:20090110_212901_s4h1A 23.79 965 211 30
                                    > 17 H1a:20090110_192901_s4h1A 29.26 965 213 27
                                    > 18 H1a:20090110_152901_s4h1A 24.37 964 218 21
                                    > 19 H1a:20090110_124901_s4h1A 23.02 965 221 17
                                    > 20 H1a:20090110_084901_s4h1A 26.72 964 227 11
                                    >
                                  • Rainer Kracht
                                    Hi all, I think I have found Alan s comet in HI1B: 20080112 1249 21 255 1329 25 259 1409 29 263 close to the expected positions. Rainer
                                    Message 17 of 25 , Jan 16, 2009
                                      Hi all,

                                      I think I have found Alan's comet in HI1B:

                                      20080112 1249 21 255
                                      1329 25 259
                                      1409 29 263

                                      close to the expected positions.

                                      Rainer
                                    • karlbattams
                                      I concur -- it s definitely there in HI1-B. This is very good news! Hopefully Brian can get a good orbit for it. I can follow it to near the end of the day
                                      Message 18 of 25 , Jan 16, 2009
                                        I concur -- it's definitely there in HI1-B. This is very good news!
                                        Hopefully Brian can get a good orbit for it. I can follow it to near
                                        the end of the day on the 12th but then it gets too faint.

                                        You guys deserve a lot of credit for this. Not only for finding it,
                                        but also for getting an orbit determination that you could use to
                                        predict visibility in HI1-B -- that's pretty awesome!

                                        I doubt I'll be able to get this out by the end of the day, but we'll
                                        see...

                                        ~~Karl

                                        --- In stereohunter@yahoogroups.com, "Rainer Kracht" <r.kracht@...> wrote:
                                        >
                                        > Hi all,
                                        >
                                        > I think I have found Alan's comet in HI1B:
                                        >
                                        > 20080112 1249 21 255
                                        > 1329 25 259
                                        > 1409 29 263
                                        >
                                        > close to the expected positions.
                                        >
                                        > Rainer
                                        >
                                      • karlbattams
                                        Following up... I can certainly see it in HI1-B (pretty clearly actually), but my positions do not agree with Rainer s. I get the following: (0,0 upper-left)
                                        Message 19 of 25 , Jan 16, 2009
                                          Following up... I can certainly see it in HI1-B (pretty clearly
                                          actually), but my positions do not agree with Rainer's.

                                          I get the following: (0,0 upper-left)
                                          DATE/TIME POS-ANGLE INSTR. X Y
                                          2009-01-12T06:49:26 316.4 HI1 1 783
                                          2009-01-12T07:29:26 315.7 HI1 5 781
                                          2009-01-12T08:09:26 315.1 HI1 9 780
                                          2009-01-12T08:49:26 314.4 HI1 13 779
                                          2009-01-12T09:29:26 313.5 HI1 19 777
                                          2009-01-12T10:09:26 312.4 HI1 25 774
                                          2009-01-12T10:49:26 311.7 HI1 29 772
                                          2009-01-12T11:29:26 310.5 HI1 37 770
                                          2009-01-12T12:09:26 309.7 HI1 41 767
                                          2009-01-12T12:49:26 309.0 HI1 45 765
                                          2009-01-12T13:29:26 308.4 HI1 48 763
                                          2009-01-12T14:09:26 307.5 HI1 54 761
                                          2009-01-12T15:29:26 306.1 HI1 63 758
                                          I lose it after soon after this.

                                          I can't actually see anything at Rainer's stated x,y's (were they
                                          512x512?). Regardless, I'm nearly done measuring in HI1B, and A is
                                          finished. So even if I have to email them from home, I will get these
                                          out to Brian tonight.

                                          Cheers,
                                          ~~Karl

                                          --- In stereohunter@yahoogroups.com, "Rainer Kracht" <r.kracht@...> wrote:
                                          >
                                          > Hi all,
                                          >
                                          > I think I have found Alan's comet in HI1B:
                                          >
                                          > 20080112 1249 21 255
                                          > 1329 25 259
                                          > 1409 29 263
                                          >
                                          > close to the expected positions.
                                          >
                                          > Rainer
                                          >
                                        • Alan Watson
                                          Gidday Karl, Rainer et al, I agree with these positions, lost across stars after this. My Ypos = Karl s 1024-ypos, which is +/- a few pixels to close Rainer s
                                          Message 20 of 25 , Jan 16, 2009
                                            Gidday Karl, Rainer et al,
                                             
                                            I agree with these positions, lost across stars after this.
                                            My Ypos = Karl's 1024-ypos, which is +/- a few pixels to close Rainer's position.
                                            We are all looking at the same object.
                                             
                                            Kind regards,
                                                Alan Watson
                                             
                                             
                                             Label                                       Mean X   Y   Slice
                                            6 H1b:20090112_152901_s4h1B 27.71 62 264 24
                                            5 H1b:20090112_140901_s4h1B 21.82 54 261 22
                                            4 H1b:20090112_120901_s4h1B 24.49 41 255 19
                                            3 H1b:20090112_104901_s4h1B 25.73 31 251 17
                                            2 H1b:20090112_080901_s4h1B 25.75 10 244 13
                                            1 H1b:20090112_072901_s4h1B 26.34 4 241 12
                                             
                                            ----- Original Message -----
                                            Sent: Saturday, January 17, 2009 8:22 AM
                                            Subject: [stereohunter] Re: Unknown object in STEREO HI1a

                                            Following up... I can certainly see it in HI1-B (pretty clearly
                                            actually), but my positions do not agree with Rainer's.

                                            I get the following: (0,0 upper-left)
                                            DATE/TIME POS-ANGLE INSTR. X Y
                                            2009-01-12T06: 49:26 316.4 HI1 1 783
                                            2009-01-12T07: 29:26 315.7 HI1 5 781
                                            2009-01-12T08: 09:26 315.1 HI1 9 780
                                            2009-01-12T08: 49:26 314.4 HI1 13 779
                                            2009-01-12T09: 29:26 313.5 HI1 19 777
                                            2009-01-12T10: 09:26 312.4 HI1 25 774
                                            2009-01-12T10: 49:26 311.7 HI1 29 772
                                            2009-01-12T11: 29:26 310.5 HI1 37 770
                                            2009-01-12T12: 09:26 309.7 HI1 41 767
                                            2009-01-12T12: 49:26 309.0 HI1 45 765
                                            2009-01-12T13: 29:26 308.4 HI1 48 763
                                            2009-01-12T14: 09:26 307.5 HI1 54 761
                                            2009-01-12T15: 29:26 306.1 HI1 63 758
                                            I lose it after soon after this.

                                            I can't actually see anything at Rainer's stated x,y's (were they
                                            512x512?). Regardless, I'm nearly done measuring in HI1B, and A is
                                            finished. So even if I have to email them from home, I will get these
                                            out to Brian tonight.

                                            Cheers,
                                            ~~Karl

                                            --- In stereohunter@ yahoogroups. com, "Rainer Kracht" <r.kracht@.. .> wrote:
                                            >
                                            > Hi all,
                                            >
                                            > I think I have found Alan's comet in HI1B:
                                            >
                                            > 20080112 1249 21 255
                                            > 1329 25 259
                                            > 1409 29 263
                                            >
                                            > close to the expected positions.
                                            >
                                            > Rainer
                                            >

                                          • karlbattams
                                            Dear all, MPEC 2009-B10 was issued a short time ago confirming this object. Also included was Alan s HI1-B Kreutz from last year (SECCHI-007). Congrats again
                                            Message 21 of 25 , Jan 17, 2009
                                              Dear all,

                                              MPEC 2009-B10 was issued a short time ago confirming this object.
                                              Also included was Alan's HI1-B Kreutz from last year (SECCHI-007).

                                              Congrats again to Alan, and to Rainer and Dimitry for their orbit
                                              determinations, both of which were close to Brian's published orbit.

                                              Regards,
                                              ~~Karl

                                              --- In stereohunter@yahoogroups.com, "Alan Watson" <awat4309@...> wrote:
                                              >
                                              > Gidday Karl, Rainer et al,
                                              >
                                              > I agree with these positions, lost across stars after this.
                                              > My Ypos = Karl's 1024-ypos, which is +/- a few pixels to close
                                              Rainer's position.
                                              > We are all looking at the same object.
                                              >
                                              > Kind regards,
                                              > Alan Watson
                                              >
                                              > Http://cometal.bigblog.com.au/index.do
                                              >
                                              > Label Mean X Y Slice
                                              > 6 H1b:20090112_152901_s4h1B 27.71 62 264 24
                                              > 5 H1b:20090112_140901_s4h1B 21.82 54 261 22
                                              > 4 H1b:20090112_120901_s4h1B 24.49 41 255 19
                                              > 3 H1b:20090112_104901_s4h1B 25.73 31 251 17
                                              > 2 H1b:20090112_080901_s4h1B 25.75 10 244 13
                                              > 1 H1b:20090112_072901_s4h1B 26.34 4 241 12
                                              >
                                              > ----- Original Message -----
                                              > From: karlbattams
                                              > To: stereohunter@yahoogroups.com
                                              > Sent: Saturday, January 17, 2009 8:22 AM
                                              > Subject: [stereohunter] Re: Unknown object in STEREO HI1a
                                              >
                                              >
                                              > Following up... I can certainly see it in HI1-B (pretty clearly
                                              > actually), but my positions do not agree with Rainer's.
                                              >
                                              > I get the following: (0,0 upper-left)
                                              > DATE/TIME POS-ANGLE INSTR. X Y
                                              > 2009-01-12T06:49:26 316.4 HI1 1 783
                                              > 2009-01-12T07:29:26 315.7 HI1 5 781
                                              > 2009-01-12T08:09:26 315.1 HI1 9 780
                                              > 2009-01-12T08:49:26 314.4 HI1 13 779
                                              > 2009-01-12T09:29:26 313.5 HI1 19 777
                                              > 2009-01-12T10:09:26 312.4 HI1 25 774
                                              > 2009-01-12T10:49:26 311.7 HI1 29 772
                                              > 2009-01-12T11:29:26 310.5 HI1 37 770
                                              > 2009-01-12T12:09:26 309.7 HI1 41 767
                                              > 2009-01-12T12:49:26 309.0 HI1 45 765
                                              > 2009-01-12T13:29:26 308.4 HI1 48 763
                                              > 2009-01-12T14:09:26 307.5 HI1 54 761
                                              > 2009-01-12T15:29:26 306.1 HI1 63 758
                                              > I lose it after soon after this.
                                              >
                                              > I can't actually see anything at Rainer's stated x,y's (were they
                                              > 512x512?). Regardless, I'm nearly done measuring in HI1B, and A is
                                              > finished. So even if I have to email them from home, I will get these
                                              > out to Brian tonight.
                                              >
                                              > Cheers,
                                              > ~~Karl
                                              >
                                              > --- In stereohunter@yahoogroups.com, "Rainer Kracht" <r.kracht@>
                                              wrote:
                                              > >
                                              > > Hi all,
                                              > >
                                              > > I think I have found Alan's comet in HI1B:
                                              > >
                                              > > 20080112 1249 21 255
                                              > > 1329 25 259
                                              > > 1409 29 263
                                              > >
                                              > > close to the expected positions.
                                              > >
                                              > > Rainer
                                              > >
                                              >
                                            • Alan Watson
                                              Gidday ALL, Unknown object in STEREO HI1a now has a name C/2009 A1 (STEREO) What great start to the IYA2009 for SOHO and STEREO comets hunters. Many thanks
                                              Message 22 of 25 , Jan 17, 2009
                                                Gidday ALL,
                                                Unknown object in STEREO HI1a now has a name  C/2009 A1 (STEREO)
                                                What great start to the IYA2009 for SOHO and STEREO comets hunters.
                                                 
                                                Many thanks Karl for your Efforts here, you could say you recovered the comet in HI1b. :)
                                                 
                                                Kind regards,
                                                    Alan Watson
                                                 
                                                 
                                                ----- Original Message -----
                                                Sent: Sunday, January 18, 2009 5:17 AM
                                                Subject: [stereohunter] Re: Unknown object in STEREO HI1a

                                                Dear all,

                                                MPEC 2009-B10 was issued a short time ago confirming this object.
                                                Also included was Alan's HI1-B Kreutz from last year (SECCHI-007) .

                                                Congrats again to Alan, and to Rainer and Dimitry for their orbit
                                                determinations, both of which were close to Brian's published orbit.

                                                Regards,
                                                ~~Karl

                                                --- In stereohunter@ yahoogroups. com, "Alan Watson" <awat4309@.. .> wrote:
                                                >
                                                > Gidday Karl, Rainer et al,
                                                >
                                                > I agree with these positions, lost across stars after this.
                                                > My Ypos = Karl's 1024-ypos, which is +/- a few pixels to close
                                                Rainer's position.
                                                > We are all looking at the same object.
                                                >
                                                > Kind regards,
                                                > Alan Watson
                                                >
                                                > Http://cometal. bigblog.com. au/index. do
                                                >
                                                > Label Mean X Y Slice
                                                > 6 H1b:20090112_ 152901_s4h1B 27.71 62 264 24
                                                > 5 H1b:20090112_ 140901_s4h1B 21.82 54 261 22
                                                > 4 H1b:20090112_ 120901_s4h1B 24.49 41 255 19
                                                > 3 H1b:20090112_ 104901_s4h1B 25.73 31 251 17
                                                > 2 H1b:20090112_ 080901_s4h1B 25.75 10 244 13
                                                > 1 H1b:20090112_ 072901_s4h1B 26.34 4 241 12
                                                >
                                                > ----- Original Message -----
                                                > From: karlbattams
                                                > To: stereohunter@ yahoogroups. com
                                                > Sent: Saturday, January 17, 2009 8:22 AM
                                                > Subject: [stereohunter] Re: Unknown object in STEREO HI1a
                                                >
                                                >
                                                > Following up... I can certainly see it in HI1-B (pretty clearly
                                                > actually), but my positions do not agree with Rainer's.
                                                >
                                                > I get the following: (0,0 upper-left)
                                                > DATE/TIME POS-ANGLE INSTR. X Y
                                                > 2009-01-12T06: 49:26 316.4 HI1 1 783
                                                > 2009-01-12T07: 29:26 315.7 HI1 5 781
                                                > 2009-01-12T08: 09:26 315.1 HI1 9 780
                                                > 2009-01-12T08: 49:26 314.4 HI1 13 779
                                                > 2009-01-12T09: 29:26 313.5 HI1 19 777
                                                > 2009-01-12T10: 09:26 312.4 HI1 25 774
                                                > 2009-01-12T10: 49:26 311.7 HI1 29 772
                                                > 2009-01-12T11: 29:26 310.5 HI1 37 770
                                                > 2009-01-12T12: 09:26 309.7 HI1 41 767
                                                > 2009-01-12T12: 49:26 309.0 HI1 45 765
                                                > 2009-01-12T13: 29:26 308.4 HI1 48 763
                                                > 2009-01-12T14: 09:26 307.5 HI1 54 761
                                                > 2009-01-12T15: 29:26 306.1 HI1 63 758
                                                > I lose it after soon after this.
                                                >
                                                > I can't actually see anything at Rainer's stated x,y's (were they
                                                > 512x512?). Regardless, I'm nearly done measuring in HI1B, and A is
                                                > finished. So even if I have to email them from home, I will get these
                                                > out to Brian tonight.
                                                >
                                                > Cheers,
                                                > ~~Karl
                                                >
                                                > --- In stereohunter@ yahoogroups. com, "Rainer Kracht" <r.kracht@>
                                                wrote:
                                                > >
                                                > > Hi all,
                                                > >
                                                > > I think I have found Alan's comet in HI1B:
                                                > >
                                                > > 20080112 1249 21 255
                                                > > 1329 25 259
                                                > > 1409 29 263
                                                > >
                                                > > close to the expected positions.
                                                > >
                                                > > Rainer
                                                > >
                                                >

                                              • Rainer Kracht
                                                ... Yes, certainly Karl has recovered the comet in HI1B. Congrats to Karl! Perhaps it will be possible now to recover it in earth-based images. Rainer
                                                Message 23 of 25 , Jan 17, 2009
                                                  On 18 Jan 2009, at 9:18, Alan Watson wrote:

                                                  > Gidday ALL,
                                                  > Unknown object in STEREO HI1a now has a name C/2009 A1 (STEREO)
                                                  > What great start to the IYA2009 for SOHO and STEREO comets hunters.
                                                  >
                                                  > Many thanks Karl for your Efforts here, you could say you recovered the comet in HI1b. :)
                                                  >
                                                  > Kind regards,
                                                  > Alan Watson
                                                  >
                                                  Yes, certainly Karl has recovered the comet in HI1B.
                                                  Congrats to Karl!
                                                  Perhaps it will be possible now to recover it in earth-based images.

                                                  Rainer
                                                • Alan Watson
                                                  Gidday Rainer et all, ... I see Mr. Michael Jaeger has joined this forum, he is most welcome here, as he is a prolific and talented comet imager. Many of the
                                                  Message 24 of 25 , Jan 17, 2009
                                                    Gidday  Rainer et all,
                                                     
                                                    >Perhaps it will be possible now to recover it in earth-based images. 
                                                    I see Mr. Michael Jaeger has joined this forum,  he is most welcome here, as he is a prolific and talented comet imager. Many of the images I  have seen are quite spectacular. Perhaps we can encourage Michael to take the challenge here.  The comet is fading fast and not that far away from the sun still.
                                                     
                                                    Kind regards,
                                                        Alan Watson
                                                     
                                                     
                                                  • Michael Jaeger
                                                    Dear Alan For me the comet is below the horizon - sorry best regards MJ ... From: Alan Watson To: stereohunter@yahoogroups.com Sent: Sunday, January 18, 2009
                                                    Message 25 of 25 , Jan 17, 2009
                                                      Dear Alan
                                                       
                                                      For me the comet is below the horizon - sorry
                                                       
                                                      best regards
                                                      MJ
                                                       
                                                       
                                                      ----- Original Message -----
                                                      Sent: Sunday, January 18, 2009 12:02 AM
                                                      Subject: [stereohunter] C/2009 A1 (STEREO)

                                                      Gidday  Rainer et all,
                                                       
                                                      >Perhaps it will be possible now to recover it in earth-based images. 
                                                      I see Mr. Michael Jaeger has joined this forum,  he is most welcome here, as he is a prolific and talented comet imager. Many of the images I  have seen are quite spectacular. Perhaps we can encourage Michael to take the challenge here.  The comet is fading fast and not that far away from the sun still.
                                                       
                                                      Kind regards,
                                                          Alan Watson
                                                       
                                                       

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