Supernova 2014F in NGC 6667 = Psn J18303179+6759297
Abstract
S. Nakano, Sumoto, Japan, reports the discovery by Koichi Itagaki (Teppo-cho, Yamagata, Japan) of an apparent supernova (mag 16.8) in NGC 6667 on an unfiltered CCD frame (limiting magnitude 18.5) taken on Jan. 11.871 UT using a 0.50-m f/6.8 reflector at the Takanezawa station, Tochigi-ken. The new object is located at R.A. = 18h30m31s.79, Decl. = +67d59'29".7 (equinox 2000.0), which is 44" west and 15" north of the center of NGC 6667. The discovery image was posted at URL http://www.k-itagaki.jp/images/6667.jpg. The variable was designated PSN J18303179+6759297 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2014F based on the spectroscopic confirmation reported below. Additional CCD magnitudes for 2014F: 2007 Aug. 23.589, [19.0 (Itagaki; 0.60-m f/5.7 reflector at Yamagata); 2014 Jan. 12.109, V = 16.6, I_c = 16.1 (Seiichiro Kiyota, Kamagaya, Japan; remotely with an iTelescope 0.5-m astrograph near Mayhill, NM, USA; image posted at URL http://meineko.sakura.ne.jp/ccd/PSN_J18303179+6759297.jpg); 12.243, 16.7 (T. Yusa, Osaki, Japan; remotely using an iTelescope 32-m f/8 astrograph near Nerpio, Spain; position end figures 31s.74, 30".1; offset 45" west and 15" north of the center of NGC 6667; limiting mag 18.5; image posted at URL http://space.geocities.jp/yusastar77/supernova/PSNinN6667_140112.htm); 12.365, 17.1 (Toshihide Noguchi, Katori, Chiba-ken, Japan; 0.23-m f/6.3 Schmidt-Cassegrain reflector + BITRAN BT-11E camera; position end figures 31s.82, 29".6; reference stars from UCAC4 catalogue; image posted at website URL http://park8.wakwak.com/~ngc/images/PSNinNGC6667.jpg; communicated by Nakano); 13.496, 16.7 (Joseph Brimacombe, Cairns, Australia; remotely using a 43-cm CDK telescope + STL-6303 camera located at the New Mexico Skies observatory near Mayhill; position end figures 31s.84, 30".0; image posted at website URL http://www.flickr.com/photos/43846774@N02/11958413115/). M. Yamanaka, Kyoto University; and Y. Moritani, T. Ui, K. Takaki, and K. S. Kawabata, Hiroshima University, obtained a low-resolution optical spectrogram (range 480-900 nm) of PSN J18303179+6759297 = SN 2014F on Jan. 12.8 UT with the 1.5-m Kanata telescope (+ HOWPol) at the Higashi-Hiroshima Observatory. The spectrum shows a blue continuum and a broad P-Cyg profile of H-alpha, suggesting that this is an early type-II supernova. A comparison with a library of supernova spectra using GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383) reveals that the spectrum gives a good match to those of several type-II supernovae (e.g., SNe 2006ca and 1999gi) close to maximum light.
- Publication:
-
Central Bureau Electronic Telegrams
- Pub Date:
- January 2014
- Bibcode:
- 2014CBET.3785....1N