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IAUC 6919: P/1998 K4

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                                                  Circular No. 6919
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/1998 K4 (MUELLER 3)
     J. V. Scotti, Lunar and Planetary Laboratory, reports his recovery
of comet P/1990 S1 (= 1990l = 1990 XIII) with the Spacewatch telescope
on Kitt Peak.  The comet is very slightly diffuse, with a coma diameter
of 12" on May 26.45 UT.  The indicated correction to the prediction by
S. Nakano on MPC 27081 is Delta T = -0.7 day.

     1998 UT             R.A. (2000) Decl.        m2
     May  24.43002   21 31 51.97   -11 59 36.1   20.6
          24.44144   21 31 52.30   -11 59 34.0   21.4
          24.45263   21 31 52.66   -11 59 33.5   21.1
          26.44283   21 32 53.34   -11 56 56.4   21.2
          26.45382   21 32 53.76   -11 56 55.5   21.2
          26.47267   21 32 54.27   -11 56 54.6   21.0

     The following improved orbital elements, by the undersigned, satisfy
24 observations 1990-1998 with mean residual 1".0:

                    Epoch = 1999 Mar.  3.0 TT
     T = 1999 Mar. 20.5047 TT         Peri. = 225.4492
     e = 0.288718                     Node  = 137.9665  2000.0
     q = 3.010484 AU                  Incl. =   9.4137
       a =  4.232474 AU    n = 0.1131912    P =   8.707 years

1998 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase      m2
May  17    21 27.57    -12 12.1    3.147    3.397   95.6   17.2     21.1
     27    21 33.16    -11 56.2    2.987    3.376  103.8   16.9     20.9
June  6    21 37.23    -11 49.1    2.834    3.354  112.4   16.2     20.8
     16    21 39.64    -11 52.2    2.689    3.333  121.4   15.1     20.6
     26    21 40.28    -12 06.6    2.557    3.313  130.9   13.4     20.4
July  6    21 39.09    -12 32.8    2.441    3.293  140.9   11.2     20.2
     16    21 36.15    -13 10.4    2.345    3.273  151.3    8.6     20.0
     26    21 31.67    -13 57.7    2.273    3.254  162.1    5.5     19.8
Aug.  5    21 26.07    -14 51.7    2.226    3.236  173.2    2.1     19.5
     15    21 19.93    -15 48.5    2.207    3.218  175.5    1.4     19.4
     25    21 13.91    -16 43.7    2.216    3.200  164.2    4.9     19.7
Sept. 4    21 08.74    -17 33.3    2.251    3.184  153.1    8.2     19.8
     14    21 04.99    -18 14.4    2.311    3.167  142.3   11.2     20.0
     24    21 03.09    -18 44.9    2.392    3.152  132.0   13.7     20.2
Oct.  4    21 03.28    -19 04.1    2.489    3.137  122.1   15.7     20.3

                      (C) Copyright 1998 CBAT
1998 May 26                    (6919)              Brian G. Marsden

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