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Re: A Potential Comet in CEPþþ, waiting to confirm!

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  • jinzhao_318
    Hi Dave, I m sorry for the positions we provided in NEO CP In fact, hours ago our measurement met a big problem. We can t get connection with net serve to get
    Message 1 of 3 , Feb 2, 2008
      Hi Dave,
      I'm sorry for the positions we provided in NEO CP
      In fact, hours ago our measurement met a big problem.
      We can't get connection with net serve to get the reference starts
      data.
      We can't use Astrometrica to measure anything.
      So the positions we can provide were not exact.

      Below is this comet GIF on Feb.2nd
      http://www.xjltp.com/XWASS/XM08AA/XM08AA-1.gif


      Best Regards
      Jin Beize

      --- In comets-ml@yahoogroups.com, "Dave Herald" <drherald@...> wrote:
      >
      > I've done a solution from the positions reported on this group.
      There are some problems
      > with the positions from C42 - and I've excluded all but the Jan 30
      position. The orbit,
      > which needs to be treated as highly uncertain, is as follows:
      >
      > Orbital elements:
      > XM08AA
      > Perihelion 2007 Dec 8.546812 TT Constraint: e=1
      > Epoch 2008 Feb 3.0 TT = JDT 2454499.5 Find_Orb
      > q 0.450871 (2000.0) P Q
      > H 12.7 Peri. 294.72214 -0.45765150 -0.32834781
      > Node 119.31769 0.54668118 0.62898588
      > e 1.0 Incl. 108.61933 -0.70120951 0.70467330
      > From 13 observations 2008 Jan. 30-Feb. 3; RMS error 0.933
      arcseconds
      >
      > 1 Feb 2008 22 58 40.362 +62 14 10.10 0.9414 1.2802 83.2 15.1
      > 2 Feb 2008 23 05 23.053 +62 12 31.17 0.9706 1.2975 83.1 15.1
      > 3 Feb 2008 23 11 43.957 +62 10 21.39 0.9999 1.3147 82.9 15.2
      > 4 Feb 2008 23 17 44.880 +62 07 49.07 1.0291 1.3319 82.7 15.3
      > 5 Feb 2008 23 23 27.482 +62 05 01.01 1.0584 1.3490 82.5 15.3
      > 6 Feb 2008 23 28 53.284 +62 02 02.84 1.0876 1.3661 82.3 15.4
      > 7 Feb 2008 23 34 03.677 +61 58 59.12 1.1168 1.3831 82.0 15.5
      > 8 Feb 2008 23 38 59.926 +61 55 53.62 1.1460 1.4000 81.7 15.5
      > 9 Feb 2008 23 43 43.182 +61 52 49.40 1.1751 1.4169 81.4 15.6
      > 10 Feb 2008 23 48 14.493 +61 49 48.92 1.2042 1.4338 81.1 15.6
      > 11 Feb 2008 23 52 34.811 +61 46 54.18 1.2332 1.4506 80.8 15.7
      > 12 Feb 2008 23 56 45.001 +61 44 06.78 1.2622 1.4673 80.4 15.8
      > 13 Feb 2008 00 00 45.850 +61 41 27.99 1.2911 1.4840 80.1 15.8
      > 14 Feb 2008 00 04 38.076 +61 38 58.79 1.3200 1.5007 79.7 15.9
      > 15 Feb 2008 00 08 22.333 +61 36 39.95 1.3488 1.5172 79.3 15.9
      > 16 Feb 2008 00 11 59.218 +61 34 32.06 1.3774 1.5338 79.0 16.0
      > 17 Feb 2008 00 15 29.277 +61 32 35.54 1.4061 1.5503 78.6 16.0
      > 18 Feb 2008 00 18 53.011 +61 30 50.69 1.4346 1.5667 78.2 16.1
      > 19 Feb 2008 00 22 10.879 +61 29 17.75 1.4630 1.5831 77.8 16.1
      > 20 Feb 2008 00 25 23.303 +61 27 56.82 1.4914 1.5994 77.4 16.2
      >
      > A separate solution that included all but two of the C42 positions
      gave an ephemeris which
      > was different to the above by 2.5m and 5.2' on Feb 20. That orbit
      had a slightly larger
      > value for Q (0.53).
      >
      > As can be seen from this, the comet is NOT close to the Earth.
      >
      > Of course, we should wait for the MPC to come out with their
      orbit.....
      >
      >
      > Dave Herald
      > Canberra, Australia
      >
      >
      > ----- Original Message -----
      > From: "P. Clay Sherrod" <drclay@...>
      > To: <comets-ml@yahoogroups.com>
      > Sent: Sunday, February 03, 2008 12:47 PM
      > Subject: Re: [comets-ml] Re: A Potential Comet in CEPþþ, waiting to
      confirm!
      >
      >
      > > Our astrometry of the comet (very close to the NEOCP) is as
      follows:
      > > Comet is 22 arc seconds across, with stellar (8/9) nucleus, m2 =
      16.4, 10 obs.; very
      > > diffuse and uniform coma, no unusual structure noted.
      > >
      > > COD H45
      > > CON [drclay@...]
      > > OBS P.C. Sherrod
      > > MEA P.C. Sherrod
      > > ACK ASO Observations
      > > AC2 drclay@...
      > > TEL 0.51-m f/4 Schmidt-Cassegrain + CCD
      > > COM Reduction done using Charon
      > > COM Charon version Mar 04 2007 15:06:10
      > > COM Report file created Sat Feb 2 19:03:05 2008
      > > NET USNO-A2
      > > XM08AA C2008 02 03.04221 23 11 59.37 +62 10 23.4
      16.2 N H45
      > > XM08AA C2008 02 03.04490 23 12 00.34 +62 10 20.6
      16.0 N H45
      > > XM08AA C2008 02 03.04617 23 12 00.83 +62 10 20.6
      16.1 N H45
      > > XM08AA C2008 02 03.04696 23 12 01.11 +62 10 20.6
      16.2 N H45
      > > XM08AA C2008 02 03.04774 23 12 01.40 +62 10 20.6
      16.2 N H45
      > > XM08AA C2008 02 03.05055 23 12 02.46 +62 10 20.5
      16.4 N H45
      > > XM08AA C2008 02 03.05378 23 12 03.57 +62 10 19.4
      16.2 N H45
      > > XM08AA C2008 02 03.05661 23 12 04.70 +62 10 18.5
      16.5 N H45
      > > XM08AA C2008 02 03.05731 23 12 04.99 +62 10 18.5
      16.4 N H45
      > > XM08AA C2008 02 03.06216 23 12 06.54 +62 10 18.4
      16.4 N H45
      > >
      > > Clay
      > > -------------
      > > Dr. P. Clay Sherrod
      > > Arkansas Sky Observatories
      > > Harvard MPC/ H43 (Conway)
      > > Harvard MPC/ H41 (Petit Jean Mountain)
      > > Harvard MPC/ H45 (Petit Jean Mtn. South)
      > > http://www.arksky.org/
      > >
      > >
      > >
      > >>>
      > >>>>Dear colleagues:
      > >>>>
      > >>>>C42 Xingming Observation Nova Survey may find a 12 mag new
      comet,
      > >>>
      > >>> the
      > >>>
      > >>>>first iamge back from 30th.Jan
      > >>>>Now It needs your help to confirm it.
      > >>>>The comet is very bright and move fast, I suggest it is not too
      far
      > >>>>from the earth.
      > >>>>XM08AA C2008 02 02.64737 23 09 34.00 +62 11 37.0 12.0 V C42
      > >>>>XM08AA C2008 02 02.65466 23 09 36.00 +62 11 35.0 12.0 V C42
      > >>>>XM08AA C2008 02 02.66146 23 09 38.00 +62 11 32.0 12.0 V C42
      > >>>>
      > >>>>Thank you very much!
      > >>>>
      > >>>>And it has turned out in the NEO CP
      > >>>>http://scully.harvard.edu/~cgi/confirmeph
      > >>>>
      > >>>>Jin Beize
      > >>>>
      > >>>
      > >>>
      > >>>
      > >>>
      > >>>
      > >>> Comet Observations List: http://groups.yahoo.com/group/CometObs/
      > >>> Comet Images List: http://groups.yahoo.com/group/Comet-Images/
      > >>>
      > >>> NOTICE: Material quoted or re-posted from the Comets Mailing
      List should be indicated
      > >>> by:
      > >>>
      > >>> Comets Mailing List [date]
      > >>> http://www.yahoogroups.com/group/comets-ml
      > >>>
      > >>> Yahoo! Groups Links
      > >>>
      > >>>
      > >>>
      > >>>
      > >>
      > >>
      > >> Comet Observations List: http://groups.yahoo.com/group/CometObs/
      > >> Comet Images List: http://groups.yahoo.com/group/Comet-Images/
      > >>
      > >> NOTICE: Material quoted or re-posted from the Comets Mailing
      List should be indicated
      > >> by:
      > >>
      > >> Comets Mailing List [date]
      > >> http://www.yahoogroups.com/group/comets-ml
      > >>
      > >> Yahoo! Groups Links
      > >>
      > >>
      > >>
      > >>
      > >>
      > >> --
      > >> No virus found in this incoming message.
      > >> Checked by AVG Free Edition.
      > >> Version: 7.5.516 / Virus Database: 269.19.19/1256 - Release
      Date: 2/2/2008 1:50 PM
      > >>
      > >>
      > >
      > >
      > >
      > > Comet Observations List: http://groups.yahoo.com/group/CometObs/
      > > Comet Images List: http://groups.yahoo.com/group/Comet-Images/
      > >
      > > NOTICE: Material quoted or re-posted from the Comets Mailing List
      should be indicated
      > > by:
      > >
      > > Comets Mailing List [date]
      > > http://www.yahoogroups.com/group/comets-ml
      > >
      > > Yahoo! Groups Links
      > >
      > >
      > >
      >
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