Electronic Telegram No. 4209
Central Bureau for Astronomical Telegrams
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SUPERNOVA 2015ba IN IC 1029 = PSN J14322919+4953345
     S. Nakano, Sumoto, Japan, reports the discovery by Koichi Itagaki
(Teppo-cho, Yamagata, Japan) of an apparent supernova (mag 16.7) on an
unfiltered CCD frame (limiting magnitude 19.0) taken on Nov. 28.807 UT using
a 0.35-m f/11 reflector remotely at the Tochigi station.  The new object is
located at R.A. = 14h32m29s.19, Decl. = +49d53'34".5 (equinox J2000.0;
reference stars from UCAC4 catalogue), which is 19".2 east and 41".7 south of
the nucleus of the galaxy IC 1029 (position end figures 27s.20, 54'16".2).
Itagaki posted his discovery image at http://k-itagaki.jp/images/IC-1029.jpg.
The variable was designated PSN J14322919+4953345 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2015ba based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes for
2015ba:  2011 Mar. 31.779, [19.0 (Itagaki); 2015 Nov. 29.187, 16.4 (T. Yusa,
Osaki, Japan; 0.32-m f/8 astrograph at the AstroCamp Observatory, Nerpio,
Spain; limiting mag 17.5; position end figures 29s.15, 33".0; offset 19"
east, 43" south; reference stars from UCAC-4 catalogue; image posted at URL
http://space.geocities.jp/yusastar77/supernova/PSNinIC1029_151129.htm);
29.214, V = 16.0 (S. Kiyota, Kamagaya, Japan; remotely with an iTelescope
0.32-m f/8 CDK astrograph at Nerpio, Spain; image posted at website URL
http://meineko.sakura.ne.jp/ccd/PSN_J14322919+4953345.jpg); 30.815, 16.2 (T.
Noguchi, Katori, Chiba-ken, Japan; 0.23-m f/6.3 reflector; position end
figures 29s.20, 33".7; galaxy nucleus position end figures 27s.23, 54'16".3;
image posted at http://park8.wakwak.com/~ngc/images/PSNinIC1029.jpg;
communicated by Nakano).

     S. Benetti, E. Cappellaro, N. Elias-Rosa, P. Ochner, A. Pastorello, L.
Tartaglia, L. Tomasella, G. Terreran, and M. Turatto, Osservatorio Astronomico
di Padova, Istituto Nazionale di Astrofisica; and M. Milan, Physics and
Astronomy Department, University of Padova, report that an optical spectrogram
(range 340-820 nm; resolution 1.4 nm) of PSN J14322919+4953345 = SN 2015ba,
obtained on Dec. 2.13 UT with the Asiago 182-cm Copernico Telescope (+ AFOSC)
in the framework of the Asiago Transient Classification Program (Tomasella et
al. 2014, A.N. 335, 841), shows that this an early type-II supernova.  The
expansion velocity, as deduced from the position of the minimum of Balmer
H-alpha and H-beta lines, is about 8900 and 8400 km/s, respectively.  The
redshift adopted for the galaxy IC 1029 (z = 0.0079) is from de Vaucouleurs
et al. (1991, RC3.9; via NED).  Classifications were done with GELATO
(Harutyunyan et al. 2008, A.Ap. 488, 383) and SNID (Blondin and Tonry 2007,
Ap.J. 666, 1024).  The Asiago classification spectra are posted at website URL
http://sngroup.oapd.inaf.it.


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

                         (C) Copyright 2015 CBAT
2015 December 3                  (CBET 4209)              Daniel W. E. Green