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IAUC 7084: 1999 A1; C/1998 P1

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                                                  Circular No. 7084
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 1999 A1
     A. C. Beresford, Myrtle Bank, South Australia, reports the
visual discovery of a comet by Justin Tilbrook.  Available
observations:

     1999 UT             R.A. (2000) Decl.        m1    Observer
     Jan. 12.486     23 38.0       -28 12        10.5   Tilbrook
          13.46014   23 39 05.62   -29 44 24.1          Garradd
          13.46231   23 39 05.69   -29 44 34.2            "
          13.46432   23 39 05.84   -29 44 43.6            "
          13.46918   23 39 06.06   -29 45 07.5            "
          13.47238   23 39 06.23   -29 45 23.1            "
          13.47668   23 39 06.42   -29 45 43.4            "
          13.48825   23 39 07.03   -29 46 40.0   11.5     "
          13.49226   23 39 07.21   -29 46 59.6          Zoltowski
          13.49604   23 39 07.43   -29 47 17.9            "
          13.50104   23 39 07.67   -29 47 42.7            "

J. Tilbrook (Clare, South Australia).  0.2-m f/6 reflector, 70x.
   Hourly motion 120" southward.  40"-50" coma, hint of nucleus, no
   tail.  Jan. 13.49 UT:  m_1 = 10.2, 70"-80" coma (0.15-m f/6
   reflector).
G. J. Garradd (Loomberah).  0.45-m f/5.4 reflector + CCD.  m_2 =
   16.7-17.0.
F. B. Zoltowski (Woomera).  0.30-m f/3.3 Schmidt-Cassegrain
   reflector + CCD.  Coma about 1' in diameter; signs of a faint,
   broad tail about 3' long in p.a. 80 deg.  m_2 = 12.7.


COMET C/1998 P1 (WILLIAMS)
     Ephemeris extension to IAUC 7042 (orbital elements MPC 33189):

1999 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Jan. 22    11 44.86   +13 23.0   1.072   1.860  129.5   24.1   10.3
Feb.  1    10 55.35   +24 13.9   1.049   1.971  151.4   13.8   10.6
     11     9 57.35   +33 17.6   1.128   2.084  160.4    9.2   11.0
     21     9 02.01   +38 45.5   1.297   2.197  147.6   14.0   11.5
Mar.  3     8 18.61   +41 12.4   1.531   2.311  131.6   18.7   12.1
     13     7 48.87   +41 59.3   1.802   2.424  117.3   21.4   12.6
     23     7 30.25   +42 01.8   2.093   2.537  104.8   22.3   13.1
Apr.  2     7 19.64   +41 47.7   2.393   2.650   93.6   22.1   13.6
     12     7 14.58   +41 29.0   2.692   2.762   83.4   21.1   14.1

                      (C) Copyright 1999 CBAT
1999 January 13                (7084)            Daniel W. E. Green

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