Electronic Telegram No. 2474

Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions) CBAT@CFA.HARVARD.EDU (science) URL http://cfa-www.harvard.edu/iau/cbat.html

SUPERNOVAE 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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Host galaxy info: vel = 8075 km/s; 1.3 x 1.3; 14.80; SBa

SN type info: unknown

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