Supernova 2014ai in NGC 2832 = Psn J09194417+3345496
Abstract
D. A. Forbes and J. Janz, Swinburne University; M. A. Norris, Max Planck Institute for Astronomy; S. Penny, Monash University; and A. J. Romanowsky, San Jose State University, report the discovery of an apparent supernova (mag approximately 18.1) on an ESI guide-camera image taken on Mar. 21.2 UT with the Keck-II telescope. The object is located at R.A. = 9h19m44s.17, Decl. = +33d45'49".4 (equinox 2000.0), which is 34".4 west and 50".3 north of the center of the galaxy NGC 2832. Nothing is visible at this position in the Sloan Digital Sky Survey or in archival Hubble Space Telescope images. Spectroscopy (range 400-1000 nm) of the variable was also obtained with the ESI, and the spectrum has the appearance of a type-Ia supernova near maximum light; the variable has thus been assigned the designation SN 2014ai. Syuichi Nakano, Sumoto, Japan, reports an independent discovery of 2014ai by Koichi Itagaki (Teppo-cho, Yamagata, Japan) at mag 16.8 on an unfiltered CCD frame (limiting magnitude 19.0) taken on Mar. 23.449 UT using a 0.50-m f/6.8 reflector remotely at the Takanezawa station, Tochigi-ken, with the position of the supernova given as R.A. = 9h19m44s.17, Decl. = +33d45'49".6 (equinox 2000.0; reference stars from UCAC4 catalogue), which is 33".4 west and 50".5 north of the nucleus of the galaxy NGC 2832. Itagaki has posted his discovery image at website URL http://k-itagaki.jp/images/NGC2832.jpg. The variable was designated PSN J09194417+3345496 when it was posted at the Central Bureau's TOCP webpage. Additional CCD magnitudes of 2014ai reported to the Central Bureau as a result of the TOCP posting: 2001 Mar. 24.528, [19.5 (Itagaki; 0.60-m f/5.7 reflector at Yamagata); 2014 Mar. 16.546, [17.5 (Itagaki; 0.50-m reflector, Takanezawa station); 23.556, 17.1 (Toshihide Noguchi, Katori, Chiba-ken, Japan; four stacked 30-s frames using a 0.23-m reflector + BITRAN BT-11E camera; limiting mag 18.5; position end figures 44s.19, 49".7; galaxy center at position end figures 46s.85, 44'59".1; image posted at URL http://park8.wakwak.com/~ngc/images/PSNinNGC2832.jpg; communicated by Nakano); 23.572, V = 17.23, I_c = 16.57 (Seiichiro Kiyota, Kamagaya, Japan; 0.25-m f/6.3 Schmidt-Cassegrain telescope + Apogee Alta E47 camera; position end figures 44s.18, 45'49".4; UCAC3 reference stars; image posted at URL http://meineko.sakura.ne.jp/ccd/PSN_J09194417+3345496.jpg); 23.961, 16.5 (G. Masi, F. Nocentini, and P. Schmeer; remotely using a 43-cm telescope near Ceccano, Italy; position end figures 44s.18, 45'49".3); 24.218, 16.5 (T. Yusa, Osaki, Japan; remotely with a 0.25-m f/3.4 hyperbolic astrograph + SBIG ST-10XME camera at the RAS Observatory near Mayhill, NM, U.S.A.; position end figures 44s.13, 45'48".7; limiting mag 18.0; image posted at URL http://space.geocities.jp/yusastar77/supernova/PSNinN2832_140324.htm).
- Publication:
-
Central Bureau Electronic Telegrams
- Pub Date:
- March 2014
- Bibcode:
- 2014CBET.3838....1F