[vsnet-alert 17759] MASTER OT J234843.23+250250.4 outburst

[Denis Denisenko]

This suspected ultracompact binary in Pegasus (see ATel #5526,
[vsnet-alert 16576] and [vsnet-alert 16608] for details) is in
outburst on the recent MASTER-Kislovodsk images.

MASTER OT J234843.23+250250.4
  20140922.859  15.76C  MASTER-Kislovodsk
  20140922.904  15.75C  MASTER-Kislovodsk

The latest negative observation in AAVSO database is 10 days ago:
  20140912.137  <178C   Eddy Muyllaert

Discovery outburst was much brighter (14.44-14.55 on 2013 Oct. 29) and
superhumps were observed with a preferred period of 0.0320d rather
than its double 0.0640d. Current outburst appears to be a normal one.

SDSS colors tell in favor of AM CVn system, indeed:
SDSS J234843.14+250249.9 (u=20.19 g=20.24 r=20.34 i=20.32 z=20.03)
http://ooruri.kusastro.kyoto-u.ac.jp/mailarchive/vsnet-alert/16576

Denis Denisenko
Member of MASTER team at SAI MSU