SN 2012en (A.R. 04 07 25.28, Dec. +01 45 33.3), scoperta il 9 settembre 2012 nella galassia pgc 14498 (offset 24W 7S), magnitudine 17.8, tipo Ia (ATEL 4370).
SN scoperta da F. Ciabattari ed E. Mazzoni con il telescopio Newton da 50cm dell'Osservatorio di Monte Agliale (Lucca).
Electronic Telegram No. 3218
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.
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SUPERNOVA 2012en IN PGC 14498 = PSN J04072528+0145333
F. Ciabattari and E. Mazzoni, Borgo a Mozzano, Italy, report their
discovery of an apparent supernova (mag 17.8) on unfiltered CCD images
(limiting mag 19) obtained on Sept. 9.12 and 10.16 UT with a 0.5-m
Newtonian telescope in the course of the Italian Supernovae Search Project.
The new object is located at R.A. = 4h07m25s.28, Decl. = +1d45'33".3
(equinox 2000.0; astrometry with respect to UCAC-2 stars), which is 24" west and
7"south of the center of the galaxy PGC 14498 = MCG +00-11-12. The variable
was designated PSN J04072528+0145333 when it was posted at the Central
Bureau's TOCP webpage and is here designated SN 2012en based on the
spectroscopic confirmation reported below. Additional magnitudes for 2012en:
1991 Oct. 14, [20.3 (Palomar Sky Survey, J plate, via Digitized Sky Survey;
reported by Ciabattari); 1995 Oct. 18, [20.3 (POSS, F plate, via DSS;
reported by Ciabattari); 2012 Sept. 11.426, 18.3 (Joseph Brimacombe, Cairns,
Australia; luminance filter; position end figures 25s.12, 32".4; image
posted at website URL http://www.flickr.com/photos/43846774@N02/7978210149/).
L. Tomasella, S. Benetti, E. Cappellaro, A. Pastorello, M. Turatto, and
S. Valenti, Osservatorio Astronomico di Padova, Istituto Nazionale di
Astrofisica, report that a spectrogram of PSN J04072528+0145333 = SN 2012en,
obtained on Sept. 11.13 UT with the Asiago 1.82-m Copernico Telescope (+
AFOSC; range 350-820 nm, resolution 1.3nm), indicates that it is a type-Ia
supernova. Adopting for the host galaxy (PGC 14498) a redshift z = 0.017295
(Saunders et al. 2000, MNRAS 317, 55; via NED), comparison with a library of
supernova spectra via GELATO (Harutyuyan et al. 2008, A.Ap. 488, 383)
indicates that 2012en is a type-Ia event around one month after maximum light.
F. Taddia, Stockholm University, reports on optical spectroscopy of PSN
J04072528+0145333 = SN 2012en, obtained with the Nordic Optical Telescope
(+ ALFOSC; range 350-900 nm, resolution 0.8 nm) on Sept. 11.15 UT. The
fully reduced spectrum, cross-correlated with a library of supernova spectra
using the "Supernova Identification" code (Blondin and Tonry 2007, Ap.J. 666,
1024), shows 2012en to be a type-Ia supernova at 40 days after maximum light.
NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.
(C) Copyright 2012 CBAT
2012 September 12 (CBET 3218) Daniel W. E. Green