[IAUC] CBET 3351: 20121223 : SUPERNOVA 2012hu = PSN J23012936+0653381

Sab Dic 22 21:46:20 ART 2012

                                                  Electronic Telegram No. 3351
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 2012hu = PSN J23012936+0653381
     A. J. Drake, S. G. Djorgovski, M. J. Graham, A. Mahabal, and R. Williams,
California Institute of Technology; J. L. Prieto, Princeton University; M.
Catelan, Pontificia Universidad Catolica de Chile; and S. M. Larson and E.
Christensen, Lunar and Planetary Laboratory, University of Arizona, report the
discovery of an apparent supernova in unfiltered Mount Lemmon Survey (MLS)
images:

 SN       2012 UT        R.A. (2000.0) Decl.       Mag.      Offset
 2012hu   Dec. 11.11   23 01 29.36  + 6 53 38.1    17.4     13".2 E, 3".8 S

The variable was designated PSN J23012936+0653381 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2012hu based on the
spectroscopic confirmation reported below.  Further CCD magnitudes for 2012hu:
Sept. 22.23 UT, [20.5 (MLS); Dec. 18.062, 17.6 (R. A. Koff, Bennett, CO, USA;
Meade 0.25-m f/10 reflector + Apogee U-47 camera; limiting magnitude 19.5;
position end figures 29s.37, 38".1; UCAC3 reference stars; image posted at URL
http://antelopehillsobservatory.org/SNpictures/PSNJ23012936+0653381final.jpg);
18.072, 17.5 (L. Elenin, Lyubertsy, Russia; and I. Molotov, Moscow; remotely
taken with a 0.45-m f/2.8 telescope at the ISON-NM Observatory near Mayhill,
NM, USA; position end figures 29s.36 +/- 0".09, 37".4 +/- 0".08; UCAC-4
reference stars; limiting mag about 19.5; image posted at website URL
http://spaceobs.org/images/TOCP/PSNJ23012936+0653381-20121218.png).

     M. Turatto, S. Benetti, L. Tomasella, A. Pastorello, E. Cappellaro, and
P. Ochner, Osservatorio Astronomico di Padova, Istituto Nazionale di
Astrofisica, report that optical spectroscopy (range 340-820 nm; resolution
1.3 nm), obtained on Dec. 17.72 UT with the Asiago 1.82-m Copernico Telescope
(+ AFOSC), shows that PSN J23012936+0653381 = SN 2012hu is a type-Ia supernova
at redshift z about 0.039.  The best match was found with several type-Ia
supernovae about 1 week after maximum light.  The expansion velocity, as
deduced from the position of the Si II 635.5-nm absorption, is about 10800
km/s.  The Asiago classification spectra are posted at the following 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 23                 (CBET 3351)              Daniel W. E. Green