Electronic Telegram No. 2952
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@eps.harvard.edu (alternate cbat@iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


SUPERNOVA 2011jg IN UGC 10331 = PSN J16171887+5919298
     Giancarlo Cortini, Predappio, Italy, reports the discovery of an apparent
supernova (mag 17.5) on several unfiltered CCD images (limiting mag 18.5)
taken on Dec. 17.735 UT with a Celestron 14 telescope (+ Starlight X-Press
SXVR-H9 camera).  The new object is located at R.A. = 16h17m18s.87, Decl. =
+59d19'29".8 (equinox 2000.0), which is 15" west and 17" north of the center
of UGC 10331.  Nothing is visible at this position on Cortini's images taken
on Oct. 3.85 and Nov. 13.8 (limiting mag 18.5) or on Palomar Sky Survey red
and blue plates.  The variable was designated PSN J16171887+5919298 when it
was posted at the Central Bureau's TOCP webpage and is here designated SN
2011jg based on the spectroscopic confirmation reported below.  Additional
CCD magnitudes for 2011jg:  Dec. 18.524, 17.7 (Joseph Brimacombe, Cairns,
Australia; luminance filter presumably used, though not explicitly stated;
position end figures 18s.96, 29".4; image posted at the following website
URL:  http://www.flickr.com/photos/43846774@N02/6535449281/); 23.780, R = 17.3
(Federica Luppi, Varese, Italy; 0.36-m f/7.9 reflector + Bessell R filter;
position end figures 18s.91, 29".3; NOMAD catalogue reference stars).

     E. Kankare and S. Mattila, Tuorla Observatory, University of Turku; D.
Wright and M. Fraser, Queen's University, Belfast; and S. Valenti and A.
Pastorello, Istituto Nazionale di Astrofisica, Osservatorio Astronomico di
Padova, report that a spectrum of PSN J16171887+5919298 = SN 2011jg was
obtained on Dec. 19.3 UT with the Nordic Optical Telescope (+ ALFOSC; range
320-910 nm, resolution 1.6 nm) and with the William Herschel Telescope (+
ISIS; range 300-975nm, resolution 1.2 nm).  Cross-correlation with a library
of supernova spectra using the "Supernova Identification" code (SNID; Blondin
and Tonry 2007, Ap.J. 666, 1024) suggests that SN 2011jg is a type-IIb
supernova showing similarity with SN 2000H at roughly 10 days after peak.
The authors further report that an image obtained with the NOT on Dec. 19
provides an R-band magnitude of about 17.8, corresponding to an absolute
magnitude of about -16.3 for SN 2011jg, assuming a distance of 65 Mpc
(H_o = 70 km/s/Mpc) for the host galaxy, UGC 10331 (Theureau et al. 1998,
A.Ap. Suppl. 130, 333).


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

                         (C) Copyright 2011 CBAT
2011 December 25                 (CBET 2952)              Daniel W. E. Green