Supernova 2012ee in IC 5050 = Psn J20451528-0537221
Abstract
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 2012ee Aug. 13.24 20 45 15.28 - 5 37 22.1 16.4 3".4 E The variable was designated PSN J20451528-0537221 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2012ee based on the spectroscopic confirmation reported below. Additional CCD magnitudes for 2012ee: June 12.42 UT, [19.5 (CSS); July 25, [19.0 (Simone Leonini, Siena, Italy); Aug. 3.942, 16.2 (S. Leonini, P. Rosi, and L. M. Tinjaca Ramirez; pre-discovery unfiltered image; limiting mag about 17.5; taken in the course of an automatic survey of the Italian Supernovae Search Project using a 0.53-m f/8.7 Ritchey-Chretien telescope + Apogee Alta U47 camera; position end figures 15s.38, 25".1; reference stars apparently from the USNO-A2 catalogue; nothing visible at this location on Palomar Sky Survey infrared, red, and blue plates); Aug. 15.217, 16.1 (Joseph Brimacombe, Cairns, Australia; luminance filter; position end figures 15s.35, 25".4; image posted at website URL http://www.flickr.com/photos/43846774@N02/7791806424/); Aug. 15.914, 15.4 (S. Leonini, G. Guerrini, P. Rosi, and L. M. Tinjaca Ramirez; Siena, Italy, as above); Aug. 17.919, 15.4 (S. Foglia and G. Galli, Pogliano Milanese, Italy; 28-cm f/6.8 Schmidt-Cassegrain reflector + ST8XME camera; UCAC-3 reference stars). L. Tomasella, A. Pastorello, S. Benetti, M. Fiaschi, P. Ochner, E. Cappellaro, M. Turatto, and S. Valenti, Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica, report that a spectrogram of PSN J20451528-0537221 = 2012ee, obtained on Aug. 17.96 UT with the Asiago 1.82-m Copernico Telescope (+ AFOSC; range 340-820 nm; resolution 2.1 nm), suggests that this is a type-Ia supernova. Adopting a redshift z = 0.027 (Huchra et al. 2003, A.J. 105, 1637), comparison with a library of supernovae spectra via GELATO (Harutyuyan et al. 2008, A.Ap. 488, 383) shows 2012ee to be similar to SN 2003du (Stanishev et al. 2007, A.Ap. 469, 645) around maximum light.
- Publication:
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Central Bureau Electronic Telegrams
- Pub Date:
- August 2012
- Bibcode:
- 2012CBET.3205....1H