Electronic Telegram No. 2100
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://www.cfa.harvard.edu/iau/cbat.html


APPARENT NOVA IN M31:  2009-12a
     Koichi Nishiyama (Kurume, Fukuoka-ken, Japan) and Fujio Kabashima
(Miyaki-cho, Saga-ken, Japan) report their discovery of an apparent nova
(mag 16.6) on seven 40-s unfiltered CCD frames (limiting magnitude 19.7) taken
around Dec. 22.488 UT using a 0.40-m f/9.8 reflector.  Five 40-s confirming
unfiltered CCD frames taken on Dec. 23.537 (limiting magnitude 19.4) yield
mag 16.7 for the new object, which is located at R.A. = 0h40m19s.40 +/- 0s.01,
Decl. = +41o15'47".6 +/- 0".1 (equinox 2000.0), which is 1634" west and 21"
south of the center of the galaxy M31.  Nothing is visible at this position on
their past frames taken on Dec. 16.486 (limiting mag 19.7) and 21.466
(limiting mag 19.8).  T. Yusa, Osaki, Japan, obtained three 120-s unfiltered
CCD exposures remotely using a 0.30-m f/12 Cassegrain reflector near Mayhill,
NM, U.S.A., on Dec. 25.191, measuring position end figures 19s.42, 47".9
and magnitude 16.9 (using USNO-B1.0 catalogue reference stars).


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2009 CBAT
2009 December 28                 (CBET 2100)              Daniel W. E. Green