[IAUC] CBET 3209: 20120824 : SUPERNOVA 2012ei IN NGC 5611 = PSN J14240571+3302565

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                                                  Electronic Telegram No. 3209
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)
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Prepared using the Tamkin Foundation Computer Network


SUPERNOVA 2012ei IN NGC 5611 = PSN J14240571+3302565
          S. Nakano, Sumoto, Japan, reports the discovery by Yoji Hirose
(Tsutsumi, Chigasaki, Kanagawa-ken, Japan) of an apparent supernova (mag
14.7) on unfiltered CCD frames (limiting mag 17.0) taken around Aug. 22.450
UT using a 0.35-m f/5.7 Schmidt-Cassegrain reflector (+ SBIG ST9XEi camera).
The new object is located at R.A. = 14h24m05s.71, Decl. = +33d02'56".5
(equinox 2000.0), which is 14".1 east and 5".8 north of the center of the
galaxy NGC 5611.  Nothing is visible at this position on the Digitized Sky
Survey (no details given).  The variable was designated PSN J14240571+3302565
when it was posted at the Central Bureau's TOCP webpage and is here
designated SN 2012ei based on the spectroscopic confirmation reported below.
Additional unfiltered CCD magnitudes forwarded by Nakano for 2012ei: May 13,
[17.5 (Hirose); 23.450, 14.9 (T. Noguchi, Katori, Chiba-ken, Japan, 0.23-m
f/6.3 Schmidt-Cassegrain reflector + BITRAN BT-11E camera; limiting mag 17.5;
position end figures 05s.81, 57".9; center of galaxy has measured position
end figures 04s.75, 50".6; UCAC3 reference stars; image was posted at website
URL http://park8.wakwak.com/~ngc/images/PSNinNGC5611.jpg); 23.451, 14.9
(Hirose).

     P. Ochner, S. Benetti, L. Tomasella, E. Cappellaro, M. Fiaschi,
A. Pastorello, M. Turatto, and S. Valenti, Osservatorio Astronomico di
Padova, Istituto Nazionale di Astrofisica, report that a low signal-to-noise
spectrogram of PSN J14240571+3302565 = SN 2012ei, obtained on Aug. 23.82 UT
with the 1.22-m Galileo telescope (+ Boller & Chivens spectrograph; range
320-780 nm, resolution 0.7 nm), suggests that this is a type-Ia supernova.
Adopting for the host galaxy, NGC 5611, a redshift z = 0.006721 (Caldwell et
al. 2003, A.J. 125, 289; via NED), a comparison with a library of supernova
spectra via GELATO (Harutyuyan et al. 2008, A.Ap. 488, 383) shows that SN
2012ei is a type-Ia event similar to several type-Ia supernovae a few days
before maximum light.


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                         (C) Copyright 2012 CBAT
2012 August 24                   (CBET 3209)              Michael Rudenko