Electronic Telegram No. 2965
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 2011jp IN NGC 1154 = PSN J02580760-1021541
     Greg Bock, Windaroo, Queensland, Australia, reports the discovery of an
apparent supernova (mag 15.5) on a 30-s unfiltered CCD image taken on Dec.
27.552 UT using a 35-cm Meade LX200R telescope (+ ST10 CCD camera).  The new
object is located at R.A. = 2h58m07s.60, Decl. = -10d21'54".1 (equinox 2000.0;
USNO-B and UCAC3 catalogues), which is 1" west and 7" south of the nucleus of
the galaxy NGC 1154.  Nothing is visible at this position on Digitized Sky
Survey red, blue, and infrared images (limiting red magnitude > 19).  The
variable was designated PSN J02580760-1021541 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2011jp based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes for
2011jp (unfiltered unless noted otherwise):  Oct. 31, [18.0 (Bock); Dec.
29.110, 17.1 (Joseph Brimacombe, Cairns, Australia; remotely using a 51-cm
RCOS telescope + STL11K camera + luminance filter at the New Mexico Skies
Observatory near Mayhill, NM, U.S.A.; position end figures 07s.60, 53".3;
image posted at URL http://www.flickr.com/photos/43846774@N02/6597503477/);
29.189, 15.9 (L. Elenin, Lyubertsy, Russia; remotely taken at the ISON-NM
Observatory near Mayhill with a 0.45-m f/2.8 telescope + KAF09000 CCD;
position end figures 07s.63, 55".1, uncertainty +/- 0".1; UCAC3 reference
stars; limiting mag about 20.6; image posted at the following website URL:
http://spaceobs.org/images/TOCP/PSNJ02580760-1021541-20111229.png).

     G. H. Marion and D. Milisavljevic, Harvard-Smithsonian Center for
Astrophysics (CfA), on behalf of the CfA Supernova Group, report that a
spectrogram (range 340-740 nm) of PSN J02580760-1021541 = 2011jp was obtained
on Dec. 29 UT by M. Calkins with the F. L. Whipple Observatory 1.5-m telescope
(+ FAST).  Cross-correlation with a library of supernova spectra using the
"Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666,
1024) shows that 2011jp is a type-IIP supernova more than two weeks after
maximum light.  A good fit is found to the template of SN 1999em at 17 days
post-maximum.

     N. Morrell, Las Campanas Observatory, reports on an optical spectrogram
(range 363-920 nm) of PSN J02580760-1021541 = SN 2011jp obtained on Dec. 29.23
UT by Povilas Palunas with the 2.5-m Las Campanas du Pont telescope (+ WFCCD),
which shows that 2011jp is a type-II supernova.  Cross-correlation with a
library of supernova spectra by means of the Supernova Identification tool
(SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) gives good matches with a
number of type-II-P supernovae between 10 and 20 days after maximum light.
From the minimum of the H_beta absorption, an expansion velocity of roughly
6000 km/s is derived, if the NED recession velocity of 4653 km/s (Huchra et
al. 1993, A.J. 105, 1637) is assumed for NGC 1154.


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

                         (C) Copyright 2011 CBAT
2011 December 31                 (CBET 2965)              Daniel W. E. Green