[IAUC] CBET 3180: 20120718 : SUPERNOVA 2012dp IN IC 1155 = PSN J16003509+1541043

[quai en eps.harvard.edu]

                                                  Electronic Telegram No. 3180
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 2012dp IN IC 1155 = PSN J16003509+1541043
     S. Howerton, Arkansas City, KS, U.S.A.; A. J. Drake, S. G. Djorgovski, A.
Mahabal, M. J. Graham, and R. Williams, California Institute of Technology;
J. L. Prieto, Princeton University; M. Catelan, Pontificia Universidad
Catolica de Chile; R. H. McNaught, Australian National University; E. C.
Beshore and S. M. Larson, Lunar and Planetary Laboratory, University of
Arizona; and E. Christensen, Gemini Observatory, report the discovery of an
apparent supernova in public images from the Catalina Sky Survey (CSS).

 SN       2012 UT        R.A. (2000.0) Decl.      Mag.      Offset
 2012dp   June 16.32   16 00 35.09  +15 41 04.3   19.5    9".7 W, 3".9 S

The variable was designated PSN J16003509+1541043 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2012dp based on the
spectroscopic confirmation reported below.  Additional magnitudes for 2012dp:
May 25.28 UT, [20.5 (CSS); June 10.29, 20.1 (CSS); 18.323, 17.8 (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 35s.17, 03".5; image posted at website URL
http://www.flickr.com/photos/43846774@N02/7398233902/); 22.008, 18.2 (Xavier
Bros, Anysllum Observatory, Ager, Spain; position end figures 35s.25, 04".7;
image posted at website URL http://tinyurl.com/89np2m8).

     L. Tomasella, S. Benetti, E. Cappellaro, P. Ochner, A. Pastorello, M.
Turatto, and S. Valenti, Osservatorio Astronomico di Padova, Istituto
Nazionale di Astrofisica, report that a noisy spectrogram of PSN
J16003509+1541043 = 2012dp, obtained on July 16.95 UT with the Asiago 1.82-m
Copernico Telescope (+ AFOSC; range 340-820 nm; resolution 2.4 nm), suggests
that it is a type-Ib supernova.  Cross-correlation with a library of supernova
spectra via the "Supernova Identification" code (SNID; Blondin and Tonry 2007,
Ap.J. 666, 1024) shows that 2012dp is similar to several normal type-Ib
supernovae not far from maximum at a redshift about 0.038 (in agreement with
that reported for the presumed host galaxy by Haynes et al. 1997, A.J. 113,
119; via NED).  The spectrum is dominated by a broad P-Cyg line centered at
about 600 nm.  If it is assumed as due to the He I 587.6-nm transition from
its minimum, an expansion velocity of about 8800 km/s is derived for the
ejecta.


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                         (C) Copyright 2012 CBAT
2012 July 18                     (CBET 3180)              Daniel W. E. Green