[IAUC] CBET 2953: 20111225 : SUPERNOVA 2011jh IN NGC 4682 = PSN J12471442-1003473

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                                                  Electronic Telegram No. 2953
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 2011jh IN NGC 4682 = PSN J12471442-1003473
     S. Nakano, Sumoto, Japan, reports the discovery by Yoji Hirose (Tsutsumi,
Chigasaki, Kanagawa-ken, Japan) of an apparent supernova (mag 16.7) on
unfiltered CCD frames (limiting magnitude 17.5) taken on Dec. 22.784 UT using
a 0.35-m f/5.7 Schmidt-Cassegrain reflector (+ SBIG ST9XEi camera).  The new
object is located at R.A. = 12h47m14s.42, Decl. = -10d03'47".3 (equinox
2000.0), which is 18" west and 1" north of the center of the galaxy NGC 4682
(whose center is measured at position end figures 15s.6, 48".5).  Nothing is
visible at this position on the Digitized Sky Survey (no date or bandpass
provided).  The variable was designated PSN J12471442-1003473 when it was
posted at the Central Bureau's TOCP webpage and is here designated SN 2011jh
based on the spectroscopic confirmation reported below.  Additional unfiltered
CCD magnitudes for 2011jh:  Apr. 24, [17.5 (Hirose); Dec. 23.761, 15.7 (T.
Noguchi, Katori, Chiba-ken, Japan; 0.23-m f/6.3 Schmidt-Cassegrain reflector +
BITRAN BT-11E camera; limiting magnitude 17.5; position end figures 14s.41,
46".3; offset 16" west, 2" north; communicated by Nakano; image posted at URL
http://park8.wakwak.com/~ngc/images/PSNinNGC4682.jpg); 24.838, 16.0 (Hirose).

     L. Tomasella, S. Valenti, S. Benetti, F. Bufano, M. Fiaschi, A.
Pastorello, and P. Ochner, Osservatorio Astronomico di Padova, Istituto
Nazionale di Astrofisica, on behalf of a larger collaboration, report that a
spectrogram of PSN J12471442-1003473 = SN 2011jh, obtained on Dec. 24.20 UT
with the Asiago 1.82-m Copernico Telescope (+ AFOSC; range 350-820 nm;
resolution 2.4 nm), suggests that 2011jh is a type-Ia supernova several days
before maximum.  The best fits to these spectra found by GELATO (Harutyunyan
et al. 2008, A.Ap. 488, 383; available at https://gelato.tng.iac.es/login.cgi)
suggest that 2011jh is similar to SN 2002bo (Benetti et al 2004, MNRAS 348,
261) at 10 days before maximum.


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 2953)              Daniel W. E. Green