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IAUC 7042: 1998 U4; C/1998 P1

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                                                 Circular No. 7042
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 1998 U4
     Timothy B. Spahr, University of Arizona, reports his discovery
of a comet.  The following observations are available:

     1998 UT             R.A. (2000) Decl.        m1    Observer
     Oct. 27.37800    4 08 45.61   -11 54 13.0   17.2   Spahr
          27.38600    4 08 45.40   -11 54 17.4            "
          27.39420    4 08 45.23   -11 54 21.0            "
          28.28339    4 08 25.09   -12 02 00.5            "
          28.29100    4 08 24.95   -12 02 03.9            "
          28.35567    4 08 23.37   -12 02 37.5   17       "
          28.37736    4 08 22.73   -12 02 47.4   17.4   Larsen

T. B. Spahr (Catalina Sky Survey).  0.41-m f/3 Schmidt telescope +
  CCD.  Tail 30" long in p.a. 285 deg.
J. Larsen and J. Scotti (Kitt Peak).  0.9-m Spacewatch Telescope.
  Coma diameter 8"; tail extends 0'.9 in p.a. 288 deg; m_2 = 19.1.


COMET C/1998 P1 (WILLIAMS)
     Ephemeris extension to IAUC 6991 (elements MPC 32595):

1998/99     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Nov. 13    13 25.14   -21 35.0   2.039   1.221   25.4   20.3    9.9
     18    13 23.97   -20 28.0   2.001   1.250   30.2   23.5   10.0
     23    13 22.52   -19 17.8   1.953   1.283   35.4   26.5   10.0
     28    13 20.72   -18 03.1   1.896   1.320   40.9   29.3   10.1
Dec.  3    13 18.45   -16 42.1   1.830   1.359   46.7   31.9   10.1
      8    13 15.59   -15 12.9   1.757   1.402   52.8   34.0   10.2
     13    13 11.99   -13 33.1   1.678   1.447   59.2   35.8   10.2
     18    13 07.45   -11 39.7   1.595   1.494   65.9   37.0   10.3
     23    13 01.76   - 9 29.2   1.508   1.543   73.1   37.6   10.3
     28    12 54.63   - 6 57.2   1.421   1.593   80.8   37.5   10.3
Jan.  2    12 45.75   - 3 59.2   1.334   1.645   89.1   36.7   10.3
      7    12 34.75   - 0 30.5   1.253   1.697   98.0   35.0   10.3
     12    12 21.20   + 3 32.9   1.179   1.751  107.8   32.3   10.3
     17    12 04.70   + 8 11.6   1.117   1.805  118.3   28.7   10.3
     22    11 44.90   +13 21.0   1.072   1.860  129.5   24.1   10.3

                      (C) Copyright 1998 CBAT
1998 October 29                (7042)            Daniel W. E. Green

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