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IAUC 7043: P/1998 U4; P/1998 S1

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                                                 Circular No. 7043
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 U4 (SPAHR)
     The following additional precise CCD positions have been
reported:

     1998 UT             R.A. (2000) Decl.        m1    Observer
     Oct. 29.26596    4 08 01.96   -12 10 20.8          Spahr
          29.26990    4 08 01.82   -12 10 23.3            "
          29.31271    4 08 00.86   -12 10 44.9   16.6   Koff
          29.46145    4 07 57.17   -12 11 59.9          Spahr
          30.39319    4 07 34.62   -12 19 48.8          Balam
          30.39801    4 07 34.50   -12 19 51.2            "

T. B. Spahr (Catalina Sky Survey).  0.41-m f/3 Schmidt telescope.
R. A. Koff (Thornton).  0.20-m f/10 Schmidt-Cassegrain telescope.
D. D. Balam (Dominion Astrophysical Observatory).  1.82-m reflector.

     Preliminary orbital elements by the undersigned from 13
observations, Oct. 27-30:

     T = 1999 Mar. 28.753 TT          Peri. = 253.680
     e = 0.30575                      Node  = 183.978   2000.0
     q = 3.93034 AU                   Incl. =  32.605
       a =  5.66127 AU     n = 0.073170     P =  13.47 years

1998 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Oct. 24     4 09.95   -11 24.5   3.196   4.000  139.0    9.4   16.5
     29     4 08.14   -12 08.1   3.169   3.996  141.6    8.9   16.5
Nov.  3     4 06.03   -12 49.0   3.148   3.992  143.8    8.4   16.5
      8     4 03.67   -13 26.7   3.133   3.987  145.2    8.1   16.5
     13     4 01.12   -14 00.7   3.125   3.984  145.9    8.0   16.5
     18     3 58.43   -14 30.4   3.123   3.980  145.8    8.0   16.5
     23     3 55.66   -14 55.4   3.128   3.976  144.8    8.2   16.5
     28     3 52.90   -15 15.4   3.139   3.973  143.1    8.6   16.5
Dec.  3     3 50.21   -15 30.3   3.156   3.969  140.8    9.0   16.5


COMET P/1998 S1 (LINEAR-MUELLER)
     Visual m_1 estimates:  Oct. 20.86 UT, 14.2 (M. Lehky, Hradec
Kralove, Czech Republic, 0.42-m reflector); 21.82, 14.0 (K.
Hornoch, Lelekovice, Czech Rep., 0.35-m reflector); 23.91, 13.7
(Hornoch); 25.86, 14.1 (Lehky).

                      (C) Copyright 1998 CBAT
1998 October 31                (7043)            Daniel W. E. Green

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