[IAUC] CBET 2964: 20111231 : SUPERNOVA 2011jo IN NGC 10 = PSN J00083457-3351148

[quai en eps.harvard.edu]

                                                  Electronic Telegram No. 2964
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 2011jo IN NGC 10 = PSN J00083457-3351148
     Greg Bock, Windaroo, Queensland, Australia, reports the discovery by
Stuart Parker (Oxford, Canterbury, New Zealand) of an apparent supernova (mag
18.0) on a 30-s unfiltered CCD image taken on Dec. 22.431 UT using a 35-cm
F/6.3 Celestron C14 reflector (+ ST10 CCD camera).  The new object is located
at R.A. = 0h08m34s.57, Decl. = -33d51'14".8 (equinox 2000.0; measured by Bock
using the USNO-B and UCAC3 catalogues), which is 2" east and 16" north of
the nucleus of the galaxy NGC 10.  Nothing is visible at this position on
Digitized Sky Survey red and infrared images (limiting red magnitude > 19)
or on Parker's image taken on 2011 Nov. 30 (limiting red mag 18.6).  The
variable was designated PSN J00083457-3351148 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2011jo based on the
spectroscopic confirmation reported below.

     Nidia Morrell, Las Campanas Observatory; and Paulina Lira, Universidad
de Chile, report that an optical spectrogram (range 363-920 nm) of PSN
J00083457-3351148 = SN 2011jo, obtained with the Las Campanas 2.5-m du Pont
telescope (+ WFCCD) on Dec. 28.04 UT, shows it to be a type-II supernova
shortly after explosion.  Cross-correlation with a library of supernova
spectra using the supernova identification tool SNID (Blondin and Tonry,
2007, Ap.J. 666, 1024) yields a best match to the spectrum of the type-II-P
supernova 1999em at three days before maximum brightness.  Considering for
the host galaxy an expansion velocity of 6811 km/s (Mathewson et al. 1992,
Ap.J. Suppl. 81, 413) -- in coincidence with nebular emission from an
underlying H II region present on the spectrum -- the minimum of the H_beta
absorption appears blueshifted by approximately 10800 km/s.  Na I absorption
at the redshift of the host galaxy is observed with an equivalent width of
0.19 nm.


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                         (C) Copyright 2011 CBAT
2011 December 31                 (CBET 2964)              Daniel W. E. Green