Electronic Telegram No. 2341
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 NOVAE IN M31:  M31N 2010-05a AND M31N 2010-06a
     Kamil Hornoch, Ondrejov Observatory, reports the discovery of an apparent
nova in the galaxy M31 by P. Hornochova and himself on a co-added 1620-s
R-band CCD frame taken with the 0.65-m telescope at Ondrejov on June 28.014 UT.
The new object, designated M31N 2010-06a, is well visible on single images
used for the co-added image, as well as on a pre-discovery, co-added, 3780-s
R-band image taken by Hornoch on June 27.034 and on a co-added 2430-s R-band
image taken on June 28.040 with the same instrumentation, but it is not
present on numerous archive images taken at Lelekovice and Ondrejov.  M31N
2010-06a is located at R.A. = 0h43m07s.52, Decl. = +41o19'48".7 (equinox
2000.0), which is 261" east and 220" north of the center of M31.  Available
R-band magnitudes for M31N 2010-06a:  June 18.152, [21.4 (P. Kubanek, J.
Gorosabel, O. L. Gil, and M. Jelinek, 1.23-m telescope at Calar Alto);
23.038, [19.5 (K. Hornoch, 0.65-m telescope at Ondrejov); 25.995, [18.9
(Hornoch and Hornochova, 0.65-m telescope at Ondrejov); 27.034, 19.3 +/- 0.2
(Hornoch); 28.014, 18.1 +/- 0.1 (Hornoch and Hornochova); 28.040, 18.2 +/- 0.1
(Hornoch and Hornochova).
     Hornoch also reports additional R-band photometry of M31N 2010-05a (cf.
CBETs 2305 and 2319), as measured by himself from a variety of images:  June
10.041 UT, 17.3 +/- 0.1 (P. Zasche, 0.65-m telescope at Ondrejov); 11.037,
17.1 +/- 0.15 (K. Hornoch, M. Wolf, and P. Hornochova, 0.65-m telescope at
Ondrejov); 11.050, 17.3 +/- 0.15 (Hornoch, Wolf, and Hornochova); 16.016, 17.2
+/- 0.15 (Hornoch, 0.65-m telescope at Ondrejov); 16.051, 17.1 +/- 0.15
(Hornoch); 18.152, 17.82 +/- 0.08 (P. Kubanek, J. Gorosabel, O. L. Gil, and M.
Jelinek, 1.23-m telescope at Calar Alto); 23.038, 17.9 +/- 0.15 (Hornoch);
23.060, 17.7 +/- 0.2 (Hornoch); 25.995, 18.1 +/- 0.15 (Hornoch and Hornochova,
0.65-m telescope at Ondrejov).


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2010 CBAT
2010 June 28                     (CBET 2341)              Daniel W. E. Green