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IAUC 6907: 1998cc; 1998bu; C/1998 J1

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                                                 Circular No. 6907
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)

SUPERNOVA 1998cc IN NGC 5172
     W. D. Li, M. Modjaz, R. R. Treffers, and A. V. Filippenko,
University of California at Berkeley, report their discovery of an
apparent supernova (mag about 18.1) during the course of the Lick
Observatory Supernova Search (cf. IAUC 6627) with the 0.8-m Katzman
Automatic Imaging Telescope (KAIT).  The object was found and
confirmed on unfiltered CCD images obtained on May 15.3 and 16.3
UT, respectively.  SN 1998cc is located at R.A. = 13h29m19s.31,
Decl. = +17o02'42".4 (equinox 2000.0), which is about 24".5 due
south of the nucleus of NGC 5172.  No stars at the position of the
supernova are visible in the Digital Sky Survey image of the field,
while KAIT images obtained on Apr. 22 and 28 show a very faint
source of roughly constant magnitude.  Whether this faint source is
an underlying H II region or the very early phase of the supernova
remains to be determined by spectroscopic observations.
     S. Jha, P. Garnavich, and R. Kirshner, Harvard-Smithsonian
Center for Astrophysics, report that a spectrogram (range 350-760
nm) was taken of SN 1998cc by P. Berlind at the Whipple Observatory
1.5-m telescope (+ FAST spectrograph) on May 16.3 UT.  The spectrum
displays He I and strong Fe II absorption, indicating that the
supernova is of type-Ib before maximum light.  The host galaxy
recession velocity, determined from narrow H-alpha emission, is
4080 km/s.

SUPERNOVA 1998bu IN NGC 3368
     Y. D. Mayya and I. Puerari, Instituto Nacional de Astrofisica
Optica y Electronica, Puebla; and O. Kuhn, Instituto de Astronomia,
UNAM, Ensenada, report the following photometric magnitudes (+/-
0.05 mag) obtained with the Observatorio Astronomico Nacional 2.1-m
telescope (+ CAMILA/NICMOS 3 camera) at San Pedro Martir, Mexico:
May 11.30-11.31 UT, J = 11.77, H = 11.73, K = 11.81; 12.15-12.19,
11.67, 11.66, 11.67; 14.15-14.21, 11.49, 11.58, 11.42.

COMET C/1998 J1 (SOHO)
     F. Farrell, Christies Beach, S. Australia, reports that on May
16.36 UT, 7x50 binoculars revealed a tail 3 deg long in p.a. 100
deg (m_1 = 2.4, coma diameter about 5'), and that the comet was
faintly visible to the naked eye (though the tail was not).

                      (C) Copyright 1998 CBAT
1998 May 16                    (6907)            Daniel W. E. Green

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