[IAUC] CBET 3364: 20121230 : SUPERNOVA 2012ig IN UGC 11706 = PSN J21142287+1514407

[quai en eps.harvard.edu]

                                                  Electronic Telegram No. 3364
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 2012ig IN UGC 11706 = PSN J21142287+1514407
     Zhijian Xu, Nanjing, Jiangsu, China; and Xing Gao, Urumqi, Xinjiang,
China, report the discovery of a possible supernova (mag approximately 16.6)
on an unfiltered 40-s survey CCD image (limiting mag about 18.5) taken at Mt.
Nanshan by Xing Gao in the course of the Xingming Observation Sky Survey
around Dec. 21.535 UT using a Celestron C14 Schmidt-Cassegrain telescope.
The new object is approximately located at R.A. = 21h14m22s.87, Decl. =
+15d14'40".7 (equinox 2000.0), which is about 5".8 east and 2" north of the
center of UGC 11706 (= PGC 66396).  Nothing is visible at this position on a
Digitized Sky Survey image from 1991 Aug. 14 (limiting mag about 19.9; no
bandpass or plate type specified).  The discoverers have posted images at
website URL http://www.xjltp.com/XOSS/XM56ZX/XM56ZX.htm.  The variable was
designated PSN J21142287+1514407 when it was posted at the Central Bureau's
TOCP webpage and is here designated SN 2012ig based on the spectroscopic
confirmation reported below.  Additional unfiltered CCD images for 2012ig:
Dec. 9, [18.7 (Xu and Gao); 10, [19.0 (Xu and Gao); 22.042, 16.2 (R. A. Koff,
Bennett, CO, USA; Meade 0.25-m f/10 reflector; limiting mag 19.4; position
end figures 22s.83, 40".1; UCAC3 reference stars; image posted at website URL
http://antelopehillsobservatory.org/SNpictures/PSNJ21142287+1514407final.jpg).

     P. Ochner, L. Tomasella, S. Benetti, E. Cappellaro, A. Pastorello, and M.
Turatto, Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica,
report that optical spectroscopy (range 340-800 nm; resolution 0.7 nm),
obtained on Dec. 28.69 UT with the Asiago 1.22-m Galileo Telescope (+ Boller &
Chivens spectrograph), shows that PSN J21142287+1514407 = SN 2012ig is a
type-Ia supernova.  Adopting for the host galaxy (UGC 11706) the redshift z =
0.015798 (Bottinelli et al. 1993, A.Ap. Suppl. 102, 57; via NED), the best
fit is obtained with various type-Ia supernovae around maximum light.  The
expansion velocity, as deduced from the position of the Si II 635.5-nm
absorption, is about 10300 km/s.  The Asiago classification spectra are posted
at website URL http://graspa.oapd.inaf.it; classification was made via GELATO
(Harutyunyan et al. 2008, A.Ap. 488, 383) and SNID (Blondin and Tonry 2007,
Ap.J. 666, 1024).


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

                         (C) Copyright 2012 CBAT
2012 December 30                 (CBET 3364)              Daniel W. E. Green