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Re: [stereohunter] Re: Unknown object in STEREO HI1a

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  • 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 1 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 2 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 3 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 4 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 5 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 6 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 7 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 8 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 9 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 10 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 11 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 12 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 13 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 14 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 15 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 16 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 17 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 18 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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