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IAUC 7145: 1999bu; 1999 H1; P/1998 U3

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                                                  Circular No. 7145
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)


SUPERNOVA 1999bu IN NGC 3786
     W. D. Li, University of California at Berkeley, on behalf of
the Lick Observatory Supernova Search (cf. IAUC 6627, 7126) with
the 0.8-m Katzman Automatic Imaging Telescope (KAIT), reports the
discovery of an apparent supernova in NGC 3786, a Seyfert galaxy
that is in a pair of interacting galaxies (Arp 294 and NGC 3788).
SN 1999bu was discovered on an unfiltered image taken on Apr. 16.3
UT (mag about 17.5).  Inspection of earlier images taken by KAIT
reveals that the supernova was barely visible on Mar. 13.3 and
clearly present on Mar. 28.3 (mag about 17.6).  The new object is
located at R.A. = 11h39m42s.50, Decl. = +31o54'29".1 (equinox
2000.0), which is about 1".3 west and 3".1 south of the nucleus of
NGC 3786.  A KAIT image of the same field on Mar. 7.3 (limiting mag
about 18.5) shows nothing at the position of the supernova.


COMET 1999 H1
     The following additional precise CCD positions are available:

     1999 UT             R.A. (2000) Decl.       Observer
     Apr. 16.77635   13 46 26.62   -68 20 21.9   Garradd
          16.77679   13 46 26.17   -68 20 21.8     "
          16.77727   13 46 25.66   -68 20 21.6     "
          17.65347   13 31 54.34   -68 11 39.8   Zoltowski
          17.65748   13 31 50.22   -68 11 36.5     "
          17.66308   13 31 44.56   -68 11 32.1     "
          17.66996   13 31 37.60   -68 11 26.6     "

G. J. Garradd (Loomberah).  0.45-m f/5.4 reflector.  m_2 = 13.9.
F. B. Zoltowski (Woomera).  0.30-m f/10 Schmidt-Cassegrain
   reflector.

     Visual m_1 and coma-diameter estimates:  Apr. 17.31 UT, 9.6,
2'.2 (S. T. Rae, Palmerston North, New Zealand, 0.25-m reflector;
comet well condensed); Apr. 17.46, 9.2, 2'.0 (A. Pearce, Nedlands,
W. Australia, 0.41-m reflector); 17.67, 8.9, 3' (Rae, 0.11-m
reflector).


COMET P/1998 U3 (JAGER)
     Visual m_1 estimates:  Mar. 4.75 UT, 10.4 (M. Lehky, Hradec
Kralove, Czech Rep., 25x100 binoculars); 17.79, 11.1 (W. Hasubick,
Buchloe, Germany, 0.44-m reflector); Apr. 6.05, 11.1 (J. Bortle,
Stormville, NY, 0.41-m reflector); 15.88, 11.6 (A. Baransky, Kiev,
Ukraine, 0.20-m reflector).

                      (C) Copyright 1999 CBAT
1999 April 17                  (7145)            Daniel W. E. Green

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