Electronic Telegram No. 2571
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


APPARENT NOVA IN M31:  M31N 2010-10d
     Three independent discoveries of a nova in M31, here designated
M31N 2010-10d, were reported, with details given below.

     Koichi Nishiyama, Kurume, Japan; and Fujio Kabashima, Miyaki, Japan,
report the discovery of a possible nova (mag 17.8) in M31 on ten 40-s
unfiltered CCD frames (limiting magnitude 19.5) taken around Oct. 29.478 UT
using a Meade 200R 0.40-m f/9.8 reflector (+ SBIG STL1001E camera).  The new
object is located at R.A. = 0h42m36s.91, Decl. = +41d19'29".9 (equinox 2000.0),
which is 84" west and 201" north of the center of the galaxy M31.  Nothing is
visible at this position on their past frames taken on Oct. 26.550 and 27.642
(limiting magnitude 19.3) or on the Digitized Sky Survey from 1986 Nov. 27
(limiting red mag 18.7).  The nearest star in Massey's M31 catalogue
(http://www.lowell.edu/users/massey/lgsurvey.html) is 1"-2" away (position
end figures 37s.01, 30."8, magnitudes V = 22.6, B = 23.4, R = 22.5).

     Guoyou Sun, Wenzhou, Zhejiang, China; and Xing Gao, Urumqi, Xinjiang,
China, report the discovery of a possible nova (mag approximately 18.5) on
several 60-s survey images (limiting mag about 19.5) taken by Xing Gao in the
course of the Xingming Observatory Sky Survey around Oct. 29.587 UT using an
unfiltered CCD camera and a Celestron C14 Schmidt-Cassegrain telescope at Mt.
Nanshan.  The new object is approximately located at R.A. = 0h42m36s.97, Decl.
= +41d19'28".7 (equinox 2000.0), which is about 110" west and 200" north of
the center of NGC 224.  Nothing is visible at this position on archival images
taken on Oct. 26.536 (limiting mag 19.0), 27.60231 (limiting mag 19.5), and
28.66069 (limiting mag 19.5).
All images can be seen from: http://www.xjltp.com/XOSS/XM10AK/XM10AK.htm

     Kamil Hornoch, Astronomical Institute, Ondrejov, reports his discovery of
an apparent nova in M31 on a co-added 1260-s R-band CCD frame taken on Oct.
29.729 UT with the 0.65-m telescope at Ondrejov.  The new object is well
visible on the co-added frame as well as on single images used for the co-
added frame, but is not present on numerous archive images taken at Lelekovice
and Ondrejov.  The object is visible also on a pre-discovery Ondrejov R-band
CCD frame taken on Oct. 28.719.  M31N 2010-10d is located at R.A. =
0h42m36s.91, Decl. = +41o19'29".6 (equinox 2000.0), which is 84" west and 201"
north of the center of M31.  Available R-band magnitudes for M31N 2010-10d,
measured by Hornoch:  2010 Oct. 22.934 UT, [20.6 (Hornoch and P. Hornochova,
0.65-m telescope at Ondrejov); 28.719, 19.8 +/- 0.25 (Hornoch and M. Wolf,
0.65-m telescope at Ondrejov); 29.729, 17.85 +/- 0.1 (Hornoch, 0.65-m
telescope at Ondrejov); 30.725, 17.2 +/- 0.1 (Hornoch and Hornochova); 30.979,
17.4 +/- 0.1 (Hornoch and Hornochova); 31.761, 17.0 +/- 0.1 (Hornoch and
Hornochova); Nov. 3.070, 17.55 +/- 0.1 (Hornoch).


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

                         (C) Copyright 2010 CBAT
2010 December 8                  (CBET 2571)              Daniel W. E. Green