Electronic Telegram No. 2168
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; Room 209; Dept. of Earth and Planetary
 Sciences; Harvard University; 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbat@cfa.harvard.edu; dwe_green@eps.harvard.edu
URL http://www.cfa.harvard.edu/iau/cbat.html


SUPERNOVA 2010Y IN NGC 3392
     Giancarlo Cortini, Predappio, Italy, reports the discovery an apparent
supernova (mag about 15.9) on several unfiltered CCD images (limiting mag
near 18.5) taken on Feb. 8.87 UT during his supernova-search program with a
0.35-m telescope at Monte Maggiore Observatory.  The new object is located at
R.A. = 10h51m03s.95, Decl. = +65d46'47" (equinox 2000.0) which is 15" east
and 7" south of the center of the galaxy NGC 3392.  Nothing is visible at
this position on his previous image of the same field taken on 2009 Dec.
27.81 (limiting mag about 18.5) or on Palomar Sky Survey red and blue plates.
     Following posting on the Central Bureau's unconfirmed-objects webpage,
D. Milisavljevic and R. Fesen, Dartmouth College, report confirmation of
2010Y as a supernova, based on low-dispersion optical spectra (range
430-790 nm) obtained with the 2.4-m Hiltner telescope (+ CCDS) at MDM
Observatory on Feb. 9.3 UT.  Comparison with a library of supernova spectra
using the "Supernova Identification" tool (SNID; Blondin and Tonry 2007,
Ap.J. 666, 1024) shows that the spectrum closely matches that of the type-Ia
supernova 1994D approximately one week before maximum light.  Weak C II
658.0-nm absorption is visible.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2010 CBAT
2010 February 9                  (CBET 2168)              Daniel W. E. Green