Electronic Telegram No. 2527 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION CBAT Director: Daniel W. E. Green; Hoffman Lab 209; Harvard University; 20 Oxford St.; Cambridge, MA 02138; U.S.A. e-mail: cbatiau@eps.harvard.edu (alternate cbat@iau.org) URL http://www.cbat.eps.harvard.edu/index.html Prepared using the Tamkin Foundation Computer Network SUPERNOVA 2010jf Denis Vida and Filip Novoselnik, on behalf of the "La Sagra Sky Survey" (LSSS) Supernova Search Team (which also includes Ivica Skokic, David Gostinski, Robert Gregic, Salvador Sanchez, Jaime Nomen, Reiner Stoss, Bill Yeung, Juan Rodriguez, and Miguel Hurtado), report the discovery of an apparent supernova (magnitude 17.7) on three CCD images (limiting mag about 20.0) taken on Oct. 20.008, 20.02, and 20.033 UT with a 0.45-m telescope. The new object is located at R.A. = 3h40m43s.47, Decl = +1d03'34".0 (equinox 2000.0), which is 14".0 west and 10".3 north of the nucleus of the presumed host galaxy, PGC 1183175. Additional approximate magnitudes for 2010jf: 1990 Oct. 21.377, [22 (Digitized Sky Survey, red plate); 2010 Oct. 24.763, 18.2 (Joseph Brimacombe, Cairns, Australia, unfiltered CCD; bright moonlight). The LSSS image from Oct. 20 has been posted (with the red DSS image on the right) at website URL http://img261.imageshack.us/img261/9140/image000z.png. Brimacombe's image is at http://www.flickr.com/photos/43846774@N02/5111468047/. D. Milisavljevic, R. Fesen, and J. Parrent, Dartmouth College, report on a low-resolution spectrum (range 450-750 nm) of 2010jf obtained at the MDM Observatory using the 2.4-m Hiltner telescope (+ MKIII) on Nov. 2.5 UT. Comparison with a library of supernova spectra using the "Supernova Identification" tool (SNID; Blondin and Tonry 2007, Ap.J., 666, 1024) shows that 2010jf appears to be a spectroscopically peculiar, sub-luminous type-Ia supernova around maximum light. The spectrum closely resembles that of SN 1986G at one day past maximum. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2010 CBAT 2010 November 3 (CBET 2527) Daniel W. E. Green