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Date and Time of the Query: 2019-08-25 T01:49:01 PDT
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For refcode 2014CBET.3875A...1C:
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NED Abstract

Copyright by Central Bureau for Astronomical Telegrams. 2014CBET.3875A...1C Electronic Telegram No. 3875 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION SUPERNOVA 2014bb IN NGC 5214 = PSN J13324911+4152151 F. Ciabattari, E. Mazzoni, and M. Rossi, Borgo a Mozzano, Italy, report the discovery of an apparent supernova (mag 16.5) on unfiltered CCD images (limiting magnitude 19.5) obtained on May 9.06 and 9.83 UT with a 0.5-m Newtonian telescope (+ FLI 4710 Proline camera). The new object is located at R.A. = 13h32m49s.11, Decl. = +41d52'15".1 (equinox 2000.0; astrometry with respect to UCAC-2 stars), which is 4" east and 4" south of the center of the galaxy NGC 5214. Nothing is visible at this position on digitized Palomar Sky Survey plates from 1996 Mar. 21 (J plate; limiting magnitude 20.3) and 1997 Apr. 11 (F plate; limiting magnitude 20.3). The variable was designated PSN J13324911+4152151 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2014bb based on the spectroscopic confirmation reported below. Additional CCD magnitudes for 2014bb: 2014 Apr. 18, [19.5 (Ciabattari et al.); 24.004, [19.3 (Simone Leonini, P. Rosi, M. Conti, L. M. Tinjaca Ramirez, and G. Guerrini, Siena, Italy; 0.53-m reflector); May 4.992, 17.5 (Leonini et al.; pre-discovery image obtained in the course of the Italian Supernovae Search Project; limiting mag about 19.3; position end figures 49s.08, 14".6; image visible via website URL http://tinyurl.com/ov948d9); 9.864, 16.3 (Gianluca Masi; remotely using a 43-cm telescope near Ceccano, Italy; position end figures 49s.05, 15".3); 10.297, 16.9 (Joseph Brimacombe, Cairns, Australia; remotely using a 43-cm CDK telescope + STL-6303 camera at the New Mexico Skies observatory near Mayhill, NM, U.S.A.; position end figures 49s.09, 15".2; image visible via URL http://tinyurl.com/qfp57g4). P. Ochner, L. Tomasella, S. Benetti, A. Pastorello, N. Elias-Rosa, E. Cappellaro, and M. Turatto, Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica, report that an optical spectrogram (range 335-785 nm; resolution 0.9 nm), obtained on May 14.84 UT with the Asiago 1.22-m Galileo Telescope (+ Boller & Chivens spectrograph), shows that PSN J13324911+4152151 = SN 2014bb is a type-Ia supernova. Assuming a recessional velocity of 8077 km/s for the host galaxy, NGC 5214 (Woods 2006, A.J. 132, 197; via NED), a best match is found with the peculiar type-Ia supernova 1998es at about one week before maximum light, both supernovae showing at this phase a shallow Si II 635-nm absorption. The prominent Na I D interstellar doublet suggests the presence of significant extinction in the host galaxy, with E(B-V) around 0.4 mag. An expansion velocity of about 10500 km/s is derived from the minimum of the Si II 635-nm line. The Asiago classification spectra are posted at website URL http://sngroup.oapd.inaf.it. Classification was made via GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383) and SNID (Blondin and Tonry 2007, Ap.J. 666, 1024). NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2014 CBAT 2014 May 22 (CBET 3875) Daniel W. E. Green
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