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IAUC 7462: C/2000 O1

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                                                  Circular No. 7462
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)


COMET C/2000 O1 (KOEHN)
     B. W. Koehn, Lowell Observatory, has reported his discovery of a
possible comet in the course of the Lowell Observatory Near-Earth-Object
Survey.  The following CCD observations are available:

     2000 UT             R.A. (2000) Decl.        m1    Observer
     July 20.36467    1 03 24.38   +39 53 01.6   17.6   Koehn
          20.37584    1 03 24.06   +39 53 03.4            "
          20.38693    1 03 23.33   +39 53 04.7            "
          20.39803    1 03 23.02   +39 53 07.6            "
          22.07410    1 02 18.03   +39 59 08.6          Busch
          22.08600    1 02 17.42   +39 59 09.5            "
          22.97988    1 01 41.57   +40 02 18.3   17.9   Ticha
          22.99126    1 01 41.11   +40 02 20.1            "
          23.37434    1 01 25.93   +40 03 38.3          Robinson
          23.39039    1 01 24.65   +40 03 41.9            "

B. W. Koehn (Lowell Observatory).  0.59-m LONEOS Schmidt.  Apparently a coma
   10" in diameter and a 50" tail in p.a. 80 deg.  Some confusion with
   surrounding stars.
M. Busch and R. Kresken (Heppenheim).  0.45-m f/4.4 reflector.
J. Ticha and M. Tichy (Klet).  0.57-m f/5.2 reflector.  Apparently diffuse;
   coma of diameter about 8" but no tail.
L. Robinson (Olathe).  0.30-m Schmidt-Cassegrain.  m2 = 18.7.

     The following preliminary parabolic orbital elements, by the
undersigned, are from nine of the above observations:

     T = 2001 Jan. 22.779 TT          Peri. =  94.670
                                      Node  =  93.310   2000.0
     q = 5.69793 AU                   Incl. = 148.855

2000 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase      m1
July 15     1 06.53    +39 32.7    5.911    5.862   82.3    9.9     17.5
     25     1 00.28    +40 09.2    5.732    5.846   91.4   10.0     17.5
Aug.  4     0 52.15    +40 38.1    5.557    5.830  100.6    9.8     17.4
     14     0 42.09    +40 56.0    5.392    5.816  109.9    9.4     17.3
     24     0 30.21    +40 59.4    5.243    5.802  119.0    8.8     17.2
Sept. 3     0 16.78    +40 44.5    5.117    5.789  127.7    7.9     17.2
     13     0 02.28    +40 08.7    5.018    5.776  135.3    7.0     17.1

                      (C) Copyright 2000 CBAT
2000 July 23                   (7462)              Brian G. Marsden

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