Altra supernova scoperta dall ISSP

Scoperta un altra supernova dall’ ISSP, la scoperta dall’osservatorio di Monte Agliale Lucca, Fabrizio Ciabattari & E. Mazzoni, scoperta in UGC12410 la notte del 28/10/2011 con il telescopio da 50cm newton.

Tipo spettrale II








Electronic Telegram No. 2887
Central Bureau for Astronomical Telegrams
CBAT Director:  Daniel W. E. Green; Hoffman Lab 209; Harvard University;
20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail: (alternate
Prepared using the Tamkin Foundation Computer Network
SUPERNOVA 2011hg IN UGC 12410 = PSN J23114884+3101004
     F. Ciabattari and E. Mazzoni, Borgo a Mozzano, Italy, report the
of an apparent supernova (mag 18.3) on unfiltered CCD images (limiting mag19.2)
obtained on Oct. 28.76 and 29.82 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. = 23h11m48s.84, Decl. = +31d01’00”.4 (equinox 2000.0; astrometry
with respect to UCAC-2 stars), which is 19″ west and 15″ south of the center of
the galaxy UGC 12410.  Nothing is visible at this position on their images from
Nov. 2010 (limiting magnitude 18.8).  The variable was designated PSN
J23114884+3101004 when it was posted on the Central Bureau’s TOCP webpage
and is here designated SN 2011hg based on the spectroscopic confirmation
reported below.
     Additional magnitudes for 2011hg (via unfiltered CCD unless noted
otherwise):  1986 Nov. 3, [20.3 (Palomar Sky Survey J plate; via
Ciabattari); 1989 July 13, [20.3 (Palomar Sky Survey F plate; via Ciabattari); 1989 July
13,[21 (red Palomar Sky Survey image, via Digitized Sky Survey; reported by
Vitali Nevski, Vitebsk, Belarus); 2011 Oct. 29.955, 17.2 (A. Dimai, Italian
Supernovae Search Project, 51-cm reflector); 29.976, R = 18.2 (Federica
Luppi, Varese, Italy; 0.36-m f/7.9 reflector + Bessell R filter; position end
figures 48s.80, 00″.6; reference stars from CMC-14 catalogue; image posted at
website URL; 30.074, 18.1 (R. A.
Koff, Bennett, CO, USA; Meade 0.25-m f/10 reflector + Apogee AP-47p CCD
camera; position end figures 48s.73, 00″.4; limiting mag 19.6; image scale 2″
/pixel); 30.140, 18.0 (Joseph Brimacombe, Cairns, Australia; position end figures
48s.81, 00″.4); 30.731, R = 18.0 (Nevski, 0.3-m reflector; position end
figures 48s.80, 00″.5; UCAC-3 catalogue; limiting mag 20.5).  Brimacombe’s image is
posted at website URL

     L. Tomasella, A. Pastorello, S. Valenti, and S. Benetti, Istituto
Nazionale di Astrofisica (INAF), Osservatorio Astronomico di Padova,
on behalf of a larger collaboration, report that a spectrogram of PSN
J23114884+3101004 = SN 2011hg, obtained on Oct. 29.97 UT with the Ekar-
Copernico 1.82-m telescope (+ AFOSC; range 360-810 nm; resolution 2.2 nm),
is a young type-II supernova.  Comparison of the observed spectrum with a
library of supernova spectra using the “GELATO” code (Harutyunyan et al. 2008, A.Ap.
488, 383), suggests as a best match SN 1995V, a few days after explosion.
The blue spectrum is dominated by broad H and He I (587.6-nm) lines with the
classical P-Cyg profile.




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