Electronic Telegram No. 2984 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 2012H IN IC 411 = PSN J05201494-2518563 G. Pignata, M. Cifuentes, Y. Apostolovski, and M. Vidal, Universidad Andres Bello; J. Maza, M. Hamuy, R. Antezana, L. Gonzalez, R. Cartier, F. Forster, S. Silva, F. Carrasco, P. Sanchez, C. Hervias, and R. Ramirez, Universidad de Chile; C. Farias and F. Aros, Pontificia Universidad Catolica de Chile; B. Conuel, Wesleyan University; G. Folatelli, IPMU, University of Tokyo; and D. Reichart, K. Ivarsen, J. Haislip, A. Crain, D. Foster, M. Nysewander, and A. LaCluyze, University of North Carolina at Chapel Hill, on behalf of the CHASE project (which is part of the Millennium Center for Supernova Science collaboration), report the discovery of an apparent supernova (mag approximately 16.7) on an unfiltered image taken on Jan. 10.16 UT with the 0.41-m 'PROMPT 3' telescope located at Cerro Tololo. The new object is located at R.A. = 5h20m14s.94 +/- 0".2, Decl. = -25o18'56".4 +/- 0".2 (equinox 2000.0), which is about 49".7 west and 31".6 north of the center of the galaxy IC 411. The variable was designated PSN J05201494-2518563 when it was posted at the Central Bureau's TOCP webpage (because Pignata gave a slightly different position when posting there) and is here designated SN 2012H based on the spectroscopic confirmation reported below. Additional CCD magnitudes for 2012H (unfiltered unless noted otherwise): 2011 Jan. 6.12-Oct. 11.30, [19.5 (stacked CHASE images); Nov. 3.13, [18.0 (CHASE); 2012 Jan. 11.08, 16.5 (CHASE); 14.232, 16.7 (Joseph Brimacombe, Cairns, Australia; remotely using a 51-cm RCOS telescope + STL11K camera + luminance filter at the New Mexico Skies Observatory near Mayhill, NM, U.S.A.; position end figures 14s.93, 56".6; image posted at website URL http://www.flickr.com/photos/43846774@N02/6697768647/); 14.264, 17.1 (L. Elenin, Lyubertsy, Russia; three stacked 300-s images remotely taken at the ISON-NM Observatory near Mayhill with a 0.45-m f/2.8 telescope + KAF09000 CCD; limiting mag about 20.1; position end figures 14s.94, 56".1, uncertainty given as +/- 0".1; UCAC3 reference stars; image posted at website URL http://spaceobs.org/images/TOCP/PSNJ05201494-2518563-20120114.png). M. R. Drout, D. Milisavljevic, E. Berger, N. Sanders, and A. M. Soderberg, Harvard University, report on low-dispersion spectra (range 330-850 nm) taken on Jan. 19 UT with the 6.5-m MMT (+ Blue Channel). PSN J05201494-2518563 = SN 2012H is a type-Ia supernova near maximum light. Comparison with a library of supernova spectra using the "Supernova Identification" tool (SNID; Blondin and Tonry 2007, Ap.J., 666, 1024) provides a good match with supernova 1994D at three days after maximum. Using the host galaxy (IC 411) redshift of z = 0.03185 (da Costa et al. 1991, Ap.J. Suppl. 75, 935), the velocity of the Si II 635.5-nm feature is estimated to be approximately 11000 km/s. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2012 CBAT 2012 January 20 (CBET 2984) Daniel W. E. Green