[IAUC] CBET 2474: 20101002 : SUPERNOVA 2010ii IN NGC 7342

[quai en eps.harvard.edu]

                                                  Electronic Telegram No. 2474
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau en eps.harvard.edu (alternate cbat en iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


SUPERNOVA 2010ii IN NGC 7342
     Further to CBET 2470, K. Lin, S. B. Cenko, W. Li, and A. V. Filippenko,
University of California, report the LOSS discovery of an apparent supernova
on unfiltered KAIT images:

 SN       2010 UT         R.A. (2000.0) Decl.        Mag.      Offset
 2010ii   Sept. 30.24   22 38 13.18  +35 29 30.0     18.0    0".2 E, 25".4 S

Nothing was visible at this position on a KAIT image taken on Sept. 27.30
UT (limiting mag 19.4).

     J. M. Silverman, S. B. Cenko, J. Choi, and A. V. Filippenko, University
of California, Berkeley, report that inspection of CCD spectra (range 340-980
nm), obtained on Oct. 1 UT with the 3-m Shane reflector (+ Kast) at Lick
Observatory, shows that 2010ii is a type-Ia supernova; after removal of the
host-galaxy recession velocity of 8075 km/s (Wegner et al. 1993, A.J. 105,
1251), the absorption minimum of the Si II 635.5-nm line is found to be
blueshifted by about 15000 km/s.  Cross-correlation with a library of
supernova spectra using the "SuperNova IDentification" code (SNID; Blondin
and Tonry 2007, Ap.J. 666, 1024) indicates that 2010ii is about one week
before maximum brightness.


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                         (C) Copyright 2010 CBAT
2010 October 2                   (CBET 2474)              Daniel W. E. Green