Electronic Telegram No. 2907
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 2011hx = PSN J02320796+4105005
     T. Kryachko, S. Korotkiy, and B. Satovskiy report the discovery of an
apparent supernova (mag approximately 18.3) on five unfiltered CCD images
(limiting mag 21.0) obtained on Nov. 1.83 UT with a 30-cm Takahashi FRC-300
telescope (+ CCD Apogee Alta U9000 camera) at Kazan State University's
Astrotel Observatory near Karachay-Cherkessia, Russia.  The new object is
located at R.A. =  2h32m07s.96 +/- 0".1, Decl. = +41d05'00".5 +/- 0".1
(equinox 2000.0), which is about 6".9 east and 1".5 south of the center of
the apparent host galaxy (which they name as PGC 2802359).  The discovery
image is posted at URL http://www.astroalert.su/files/pgc2802359_psn.png.
The variable was designated PSN J02320796+4105005 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2011hx based on the
spectroscopic confirmation reported below.  Additional magnitudes for 2011hx
(obtained via unfiltered CCD unless noted otherwise):  1989 Sept. 3, [21.0
(Palomar Sky Survey red plate, via the Digitized Sky Survey; via Kryachko et
al.); 2011 Nov. 14.783, 16.2 (V. Gerke, Ka-Dar Observatory, TAU Station,
Nizhny Arkhyz, Russia; 40-cm telescope + STL-11000M camera; position end
figures 07s.98, 00".3; UCAC3 reference stars, uncertainty 0".3; image posted
at http://www.astroalert.su/files/psn_j02320796_4105005_tau_2011-11-14.png);
15.082, 16.2 (R. A. Koff, Bennett, CO, USA; Meade 0.25-m f/10 reflector +
Apogee AP-47p CCD camera; limiting magnitude 19.6; position end figures 07s.97,
04'59".1; UCAC3 reference stars); 15.138, 16.4 (Joseph Brimacombe, Cairns,
Australia; position end figures 07s.96, 05'00".5; image posted at website URL
http://www.flickr.com/photos/43846774@N02/6349120781/); 16.946, 16.4
(Federica Luppi and Luca Buzzi, Varese, Italy; 0.38-m f/6.8 reflector;
position end figures 07s.98, 00".2; reference stars from CMC-14 catalogue;
image posted at http://www.astrogeo.va.it/pub/TOCP/PSN_02320796+4105005.jpg).

     S. Valenti, A. Pastorello, S. Benetti, L. Tomasella, F. Bufano, and P.
Ochner, Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Padova,
on behalf of a larger collaboration, report that a spectrogram of PSN
J02320796+4105005 = SN 2011hx, obtained on Nov. 19.86 UT with the 1.82-m
Copernico Telescope (+ AFOSC; range 340-790 nm, resolution 2.2 nm), shows that
it is a young type-II supernova.  The best fit to this spectrum found using
a library of supernova spectra via GELATO (Harutyunyan et al. 2008, A.Ap.
488, 383; available at website URL https://gelato.tng.iac.es/login.cgi),
suggests that 2011hx is similar to SN 2007od (Inserra et al. 2011, MNRAS 417,
261) a few days past maximum.


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

                         (C) Copyright 2011 CBAT
2011 November 22                 (CBET 2907)              Daniel W. E. Green