Electronic Telegram No. 2190
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; Room 209; Dept. of Earth and Planetary
 Sciences; Harvard University; 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbat@iau.org; cbatiau@eps.harvard.edu
URL http://www.cfa.harvard.edu/iau/cbat.html


APPARENT NOVA IN M31:  M31N 2010-02a
     Kamil Hornoch, Ondrejov Observatory, reports the discovery by P.
Hornochova and himself of a fairly bright apparent nova in M31 on co-added
1080-s and 900-s R-band CCD frames taken with the 0.65-m telescope at
Ondrejov on Feb. 27.749 and 27.763 UT, respectively; the new object,
designated M31N 2010-02a, is well visible on single images used for each
co-added frame.  The apparent nova is located at R.A. = 0h42m36s.87, Decl. =
+41o15'29".6 (equinox 2000.0), which is 84" west and 39" south of the center
of the galaxy M31.  Available R-band magnitudes for M31N 2010-02a:  Jan.
31.838, [21.3 (P. Kubanek, N. Morales, J. L. Ortiz, J. Gorosabel, and M.
Jelinek, 1.23-m telescope at Calar Alto); Feb. 25.745, [20.1 (K. Hornoch,
0.65-m telescope at Ondrejov); 27.749, 15.54 +/- 0.09 (Hornoch and P.
Hornochova, 0.65-m telescope at Ondrejov); 27.763, 15.68 +/- 0.08 (Hornoch
and Hornochova).  Also, nothing visible at this position on numerous
Lelekovice and Ondrejov images back to 2002.
     Koichi Nishiyama, Kurume, Fukuoka-ken, Japan; and Fujio Kabashima,
Miyaki-cho, Saga-ken, Japan, report their independent discovery of M31N
2010-02a at mag 16.4 on seven 40-s unfiltered CCD frames (limiting magnitude
18.7) taken around Feb. 28.426 UT using a Meade 200R 0.40-m f/9.8 reflector
(+ SBIG STL1001E camera), providing position end figures 36s.82, 29".4 (and
offset 85" west and 39" south from the center of the galaxy), adding that
nothing is visible at this position on their past frames taken on Feb 21.433
and 23.432 (limiting magnitude 18.8) or on Digitized Sky Survey red and
infrared plates.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2010 CBAT
2010 March 1                     (CBET 2190)              Daniel W. E. Green