Electronic Telegram No. 2533 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 NOVA IN M33: M33N 2010-10a Koichi Nishiyama, Kurume, Japan; and Fujio Kabashima, Miyaki, Japan, report the discovery of an apparent nova (mag 18.1) in M33 on seven 40-s unfiltered CCD frames (limiting magnitude = 19.1) taken around Oct. 26.654 UT, using a Meade 200R 0.40-m f/9.8 reflector (+ SBIG STL1001E camera); they measure the new star's position to be R.A. = 1h33m57s.12 +/- 0s.02, Decl. = +30d45'53".2 +/- 0".4 (equinox 2000.0), which is 80" east and 377" north of the center of the galaxy M33. Additional magnitudes for the nova, designated M33N 2010-10a (provided by Nishiyama and Kabashima unless noted otherwise): 1989 Dec. 4, [18.7 (Digitized Sky Survey; infrared plate); 1991 Oct. 5, [18.7 (DSS; red plate); 2010 Oct. 16.713, [19.0; 17.618, [18.8; 27.606, 17.7; 28.160, 18.5 (T. Yusa, Osaki, Japan); 29.605, 18.5; Nov. 1.606, 18.8. Yusa's unfiltered CCD images from Oct. 28 were taken remotely using a 0.25-m f/3.4 reflector at the GRAS Observatory near Mayhill, NM, U.S.A., following posting on the Central Bureau's unconfirmed-objects webpage; he posted his image at http://www.palette.furukawa.miyagi.jp/space/images/PNinM33_101028.jpg. A. W. Shafter, San Diego State University; M. J. Darnley and M. F. Bode, John Moores University, Liverpool; R. Ciardullo, Pennsylvania State University; and K. A. Misselt, University of Arizona, report that a spectrum of M33N 2010-10a, obtained on 2010 Oct. 28.37 UT with the Low-Resolution Spectrograph on the 9.2-m Hobby-Eberly Telescope, reveals broad Balmer emission (FWHM about 4800 km/s), along with weaker emission features of He I and Fe II superimposed on a flat continuum. These observations confirm that the object is a nova and that it is a member of the "Fe IIb" or "hybrid" spectroscopic class. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2010 CBAT 2010 November 5 (CBET 2533) Daniel W. E. Green