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IAUC 6991: 1998dk; C/1998 P1

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                                                 Circular No. 6991
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)


SUPERNOVA 1998dk IN UGC 139
     J. Y. King, M. Modjaz, T. Shefler, E. Halderson, W. D. Li,
R. R. Treffers, and A. V. Filippenko, University of California at
Berkeley, report their discovery of an apparent supernova during
the course of the Lick Observatory Supernova Search (cf. IAUC 6627)
with the 0.8-m Katzman Automatic Imaging Telescope (KAIT).  SN
1998dk was found and confirmed in unfiltered CCD images obtained on
Aug. 19.4 (mag about 17.6) and 20.4 UT (mag about 17.0).  The new
object is located at R.A. = 0h14m32s.16, Decl. = -0o44'10".9
(equinox 2000.0), which is about 5".4 east and 3".1 north of the
nucleus of UGC 139.  A KAIT image obtained on Aug. 15.4 shows no
star at this position (limiting mag about 18.5).


COMET C/1998 P1 (WILLIAMS)
     Improved parabolic orbital elements from MPEC 1998-Q10:

     T = 1998 Oct. 17.836 TT          Peri. = 294.466
                                      Node  = 156.376   2000.0
     q = 1.14678 AU                   Incl. = 145.729

1998 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Aug. 15    14 35.93   -59 41.8   1.054   1.520   94.7   41.6    8.4
     20    14 13.39   -54 22.7   1.141   1.472   86.0   43.3    8.5
     25    13 59.65   -49 48.4   1.237   1.426   78.0   43.9    8.5
     30    13 50.75   -45 56.9   1.336   1.382   70.6   43.6    8.5
Sept. 4    13 44.75   -42 42.0   1.436   1.341   63.7   42.4    8.6
      9    13 40.55   -39 56.9   1.534   1.302   57.2   40.6    8.6
     14    13 37.54   -37 35.5   1.628   1.267   51.1   38.2    8.6
     19    13 35.33   -35 33.2   1.716   1.236   45.2   35.3    8.6
     24    13 33.67   -33 45.7   1.797   1.209   39.7   32.0    8.6
     29    13 32.38   -32 10.0   1.870   1.186   34.3   28.4    8.6
Oct.  4    13 31.35   -30 43.5   1.934   1.168   29.3   24.7    8.6

     Visual m_1 estimates:  Aug. 12.42 UT, 8.4 (M. Mattiazzo,
Wallaroo, S. Australia, 0.20-m reflector); 13.47, 8.6 (C. E.
Drescher, Warrill View, Queensland, Australia, 0.25-m refl.); 15.82,
8.8 (J. G. S. Aguiar, Campinas, S.P, Brazil, 11x80 binoculars);
17.47, 8.3 (S. T. Rae, Palmerston North, New Zealand, 0.11-m refl.);
19.91, 8.5 (W. C. de Souza, Sao Paulo, Brazil, 11x80 binoc.); 20.23,
8.5 (S. J. O'Meara, Volcano, HI, 0.10-m refractor).

                      (C) Copyright 1998 CBAT
1998 August 20                 (6991)            Daniel W. E. Green

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