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IAUC 6784: P/1997 X2

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                                                 Circular No. 6784
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
Phone 617-495-7244/7440/7444 (for emergency use only)


COMET P/1997 X2 (KOWAL-VAVROVA)
     J. V. Scotti reports his recovery of comet P/1983 J3 (= 1983t
= 1983 III) = 1983 JG with the Spacewatch telescope at Kitt Peak.
No information about the comet's appearance was given for Dec. 5;
on Dec. 6, the comet was stellar (m_2 = 22.3).

     1997 UT             R.A. (2000) Decl.        m1
     Dec.  5.48725   10 26 08.29   + 5 23 55.5   21.8
           5.49825   10 26 08.57   + 5 23 53.6   20.8
           5.50948   10 26 08.97   + 5 23 50.7   21.6
           6.48070   10 26 36.39   + 5 20 25.1
           6.50146   10 26 36.93   + 5 20 19.3
           6.52285   10 26 37.50   + 5 20 16.5

The indicated correction to the prediction by S. Nakano on MPC
25184 (ephemeris on MPC 30481) is Delta(T) about +5.3 days.  The
following improved orbital elements by G. V. Williams, Smithsonian
Astrophysical Observatory, are from 14 observations, 1983-1997
(mean residual 0".8):

                    Epoch = 1998 Nov.  3.0 TT
     T = 1998 Nov. 19.0548 TT         Peri. =  18.7359
     e = 0.587156                     Node  = 202.2878  2000.0
     q = 2.575587 AU                  Incl. =   4.3454
       a =  6.238637 AU    n = 0.0632513    P =  15.582 years

1997/98     R. A. (2000) Decl.   Delta     r    Elong. Phase    m2
Dec.  8    10 27.30   + 5 15.2   3.412   3.701   99.3   15.2   22.3
     18    10 31.05   + 4 45.0   3.220   3.652  108.4   14.8   22.2
     28    10 33.28   + 4 23.5   3.037   3.604  117.9   14.0   22.0
Jan.  7    10 33.85   + 4 12.4   2.866   3.555  127.9   12.6   21.8
     17    10 32.68   + 4 12.7   2.711   3.507  138.2   10.8   21.6
     27    10 29.81   + 4 24.9   2.577   3.459  149.0    8.4   21.3
Feb.  6    10 25.40   + 4 48.8   2.468   3.412  160.1    5.6   21.1
     16    10 19.84   + 5 22.7   2.386   3.365  171.0    2.6   20.8
     26    10 13.66   + 6 03.8   2.333   3.319  173.9    1.8   20.7
Mar.  8    10 07.53   + 6 48.1   2.309   3.273  163.6    4.9   20.8
     18    10 02.16   + 7 31.4   2.313   3.228  152.4    8.2   20.9
     28     9 58.13   + 8 09.7   2.342   3.184  141.5   11.3   21.1
Apr.  7     9 55.90   + 8 40.0   2.392   3.141  131.0   13.9   21.2

                      (C) Copyright 1997 CBAT
1997 December 10               (6784)            Daniel W. E. Green

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