Central Bureau for Astronomical Telegrams

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IAUC 7413: 2000cc; 2000ca; 2000E; 2000cb

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IAUC number

                                                  Circular No. 7413
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  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)

SUPERNOVA 2000cc IN CGCG 140-014
     Y. Sato and W. D. Li, University of California at Berkeley, on
behalf of the Lick Observatory Supernova Search (cf. IAUC 6627,
7126), report the discovery with the 0.8-m Katzman Automatic
Imaging Telescope (KAIT) of an apparent supernova on unfiltered
images taken on Apr. 30.5 (limiting mag about 19.0) and May 1.5 UT
(limiting mag about 20.5), both showing the new star at mag about
18.5.  SN 2000cc was also present on an unfiltered image taken on
Apr. 26.5 at about the same brightness, and the new object is
located at R.A. = 17h23m14s.34, Decl. = +23o40'18".7 (equinox
2000.0), which is 5".9 east and 9".1 south of the nucleus of CGCG
140-014.  Unfiltered images of the field taken on 2000 Apr. 10.5
(limiting mag about 19.0) and 1998 July 16.3 (limiting mag about
19.5) showed nothing at the position of the new object.

SUPERNOVA 2000ca IN ESO 383-32
     G. Aldering and A. Conley, Lawrence Berkeley National
Laboratory, report that an optical spectrum (range 330-900 nm) of
SN 2000ca (IAUC 7409), taken with the Cerro Tololo 4-m telescope (+
RC spectrograph) on Apr. 29.3 UT, exhibits the features of a type-
Ia supernova near maximum light.  The spectrum shows a strong Si II
635.5-nm feature; the photospheric expansion velocity is 11 000
km/s, based on the minimum of this feature and the NED redshift for
the host galaxy ESO 383-32 (z = 0.024).  The ratio of Si II
features at 580 and 610 nm is about 0.18, suggesting that this
supernova is slightly hotter and more luminous than normal (cf.
Nugent et al. 1995, Ap.J. 455, L147).  Very weak absorption lines
(EW about 0.02 nm) due to Na D at the redshift of the host galaxy
may be present, indicating modest extinction by the host galaxy.

     CCD R magnitudes:  Apr. 21.007 UT, 16.1 +/- 0.1 (K. Hornoch,
Lelekovice, Czech Republic); 21.85, 16.0 +/- 0.1 (Hornoch); 22.862,
16.1 +/- 0.1 (Hornoch); 23.866, 16.0 +/- 0.1 (Hornoch); 24.074,
16.0 +/- 0.1 (D. Hanzl, Brno, Czech Rep.); 24.838, 15.9 +/- 0.2
(Hornoch); 28.991, 16.0 +/- 0.1 (Hornoch); May 1.087, 16.2 +/- 0.1

SUPERNOVA 2000cb IN IC 1158
Corrigendum.  On IAUC 7410, line 25, for  10 000 km/s.  read
  18 200 km/s.

                      (C) Copyright 2000 CBAT
2000 May 1                     (7413)            Daniel W. E. Green

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