[vsnet-alert 13599] New CV in Andromeda MASTER OT J232022.36+444330.8

[Denis Denisenko]

MASTER Team reported a new transient source in ATel 3570 (Parhomenko et al.),
http://www.astronomerstelegram.org/?read=3570

Coordinates (J2000.0): 23 20 22.36 +44 43 30.8 (+/-0.5")

Reported unfiltered magnitude: 15.9+/-0.1 on 2011-08-17 23:10:15 UT
(JD=2455791.465)

In VSNet format:

 YYYYMMDD(UT)   mag  observer
 20110817.965  159C  MASTER-Kislovodsk

I have checked available Palomar DSS images and have found a previous
outburst on POSS-I Blue and Red plates taken on 1953 Oct. 31. Object
is blue at maximum, which suggests the dwarf nova outburst. There is
nothing at the position of the transient on the other 7 available DSS
plates, on their combination (limiting magnitude deeper than 21.5), as
well as on 7 NEAT images and in 2MASS JHK images.

Comparison of 1953 and 1993 Blue plates (negatives):

http://pics.livejournal.com/bigdenru/pic/0009w432/

Animation of the same two plates:

http://pics.livejournal.com/bigdenru/pic/0009xa2w/

The current outburst appears to be brighter than the archival 1953
one, thus it might be a superoutburst. Photometric time series are
encouraged.

Denis Denisenko