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IAUC 6977: 1998de; C/1998 H1; C/1998 K5

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                                                 Circular No. 6977
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 1998de IN NGC 252
     M. Modjaz, E. Halderson, T. Shefler, J. Y. King, 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
1998de was found and confirmed in unfiltered CCD images obtained on
July 23.5 (mag about 18.4) and 24.5 UT (mag about 17.8).  The
object is located at R.A. = 0h48m06s.88, Decl. = +27o37'28".5
(equinox 2000.0), which is about 71".9 east and 3".4 north of the
nucleus of NGC 252.  A KAIT image on July 19.5 already showed a
hint of the supernova, and a KAIT image on July 14.5 did not show
any star at the supernova's position (limiting mag about 19.0).


COMET C/1998 H1 (STONEHOUSE)
     Ephemeris extension to IAUC 6930 (elements MPC 31893):

1998 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
July 16    12 16.96   +50 45.9   2.247   1.956   60.5   26.9   14.4
     26    12 23.08   +50 43.7   2.419   2.044   56.5   24.5   14.7
Aug.  5    12 31.35   +50 45.2   2.571   2.134   53.7   22.5   15.0
     15    12 41.39   +50 52.5   2.702   2.227   52.0   21.0   15.3
     25    12 53.02   +51 07.2   2.811   2.321   51.5   19.9   15.5
Sept. 4    13 06.11   +51 31.0   2.901   2.418   52.2   19.2   15.8
     14    13 20.61   +52 05.2   2.972   2.515   54.0   18.9   16.0
     24    13 36.56   +52 51.0   3.028   2.614   56.6   18.7   16.2

     Total visual magnitude estimates:  July 18.88 UT, 14.6 (M.
Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector; 20.88,
14.5 (Lehky); 20.90, 13.9 (K. Hornoch, Lelekovice, Czech Republic,
0.35-m reflector; 21.89, 14.0 (Hornoch).


COMET C/1998 K5 (LINEAR)
     Visual m_1 estimates (L = reflector):  June 18.27 UT, 13.2 (A.
Hale, Cloudcroft, NM, 0.41-m L); 25.97, 12.9 (K. Sarneczky,
Agasvar, Hungary, 0.44-m L); July 2.89, 12.1 (K. Hornoch,
Lelekovice, Czech Republic, 0.35-m L); 19.98, 12.5 (M. Meyer,
Frauenstein, Germany, 0.25-m L); 23.01, 12.5 (R. J. Bouma, Lattrop,
The Netherlands, 0.40-m L).

                      (C) Copyright 1998 CBAT
1998 July 24                   (6977)            Daniel W. E. Green

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