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IAUC 7255: P/1999 R2

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                                                  Circular No. 7255
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 P/1999 R2 (GE-WANG)
     J. V. Scotti, Lunar and Planetary Laboratory, reports his recovery
of comet P/1988 V1 (= 1988o = 1988 VIII) with the Spacewatch 0.9-m
telescope at Kitt Peak:

     1999 UT             R.A. (2000) Decl.        m1
     Sept.15.44370    2 21 17.24   + 6 41 27.2
          15.46496    2 21 17.25   + 6 41 18.1   20.3
          15.49196    2 21 17.37   + 6 41 06.6   20.3
          15.44370    2 21 17.24   + 6 41 27.2
          15.46496    2 21 17.25   + 6 41 18.1   20.3
          15.49196    2 21 17.37   + 6 41 06.6   20.3
          16.45333    2 21 18.30   + 6 34 23.3
          16.47169    2 21 18.28   + 6 34 15.9   19.8
          16.48999    2 21 18.24   + 6 34 07.8   19.4

The nuclear magnitude m2 = 22.1.  On Sept. 15 there was a coma 12" across
and a tail extending 0'.53 in p.a. 266 deg.  On Sept. 16 the coma diameter
was 11", and the tail extended 0'.47 in p.a. 267 deg.  The indicated
correction to the prediction by S. Nakano on MPC 27081 is Delta T = -5.5 days.

     The following improved orbital elements, by the undersigned, satisfy
20 observations 1988-1999 with a mean residual of 0".8:

                    Epoch = 1999 July  1.0 TT
     T = 1999 June 21.4782 TT         Peri. = 177.3858
     e = 0.500318                     Node  = 177.1400  2000.0
     q = 2.496405 AU                  Incl. =  12.1732
       a =  4.995986 AU    n = 0.0882617    P =  11.167 years

1999 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase      m1
Sept. 9     2 20.59    + 7 23.5    1.801    2.570  130.3   17.4     19.4
     19     2 21.24    + 6 16.1    1.738    2.589  139.9   14.5     19.3
     29     2 19.58    + 4 58.1    1.694    2.610  150.0   11.1     19.3
Oct.  9     2 15.96    + 3 34.8    1.672    2.633  160.0    7.5     19.3
     19     2 11.00    + 2 13.2    1.675    2.657  168.0    4.5     19.4
     29     2 05.55    + 1 00.6    1.705    2.684  167.7    4.5     19.4
Nov.  8     2 00.45    + 0 03.2    1.761    2.712  159.5    7.3     19.6
     18     1 56.48    - 0 34.9    1.843    2.741  149.5   10.5     19.7
     28     1 54.19    - 0 52.2    1.948    2.773  139.4   13.4     19.9
Dec.  8     1 53.84    - 0 49.8    2.071    2.805  129.7   15.7     20.1

                      (C) Copyright 1999 CBAT
1999 September 17             (7255)              Brian G. Marsden

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