[vsnet-alert 17225] MASTER OT J191841.98+444914.5 - new CV in Kepler field

[Denis Denisenko]

Pavel Balanutsa has found new CV in Cygnus among MASTER-Tunka
transients from the last night. It was published in ATel #6071
<http://www.astronomerstelegram.org/?read=6071>. The star was
discovered at 16.8m on Apr. 13 and appears to be rising. It has
brightened by 1.0m in two nights since Apr. 11. A previous outburst to
15.2m was found in archival data obtained 3.5 years ago when there
were no reference images to compare to.

MASTER OT J191841.98+444914.5 = KIC 8683556
  20101014.859   152C   MASTER-Tunka
  20101014.890   152C   MASTER-Tunka
  20140411.7733  176C   MASTER-Tunka
  20140411.8237  177C   MASTER-Tunka
  20140413.7242  168C   MASTER-Tunka
  20140413.7717  167C   MASTER-Tunka

MASTER-Tunka discovery and reference images:
http://master.sai.msu.ru/static/OT/191841.98444914.5.png
Much brighter Oct. 14th, 2010 outburst:
http://master.sai.msu.ru/static/OT/J191842+444914-Tunka20101014.jpg

Color-combined DSS finder chart:
http://master.sai.msu.ru/static/OT/J191842+444914-BRIR.jpg (10'x10'
FOV)
The star was in outburst on the POSS-II blue plate taken on 1990 July
18, hence such a blue color.

IDs in catalogs:
USNO-B1.0 1348-0328932 (19 18 42.042 +44 49 13.05 B1=19.56 R1=N/A
B2=16.57 R2=19.19 I=N/A)
GALEX J191842.0+444912 (NUV=19.09+/-0.03)
This area of sky is not covered by SDSS and Catalina Sky Survey.

The Kepler-INT survey (Greiss et al., 2012) gives the following
magnitudes: g=19.73 r=19.76 i=19.75.

Follow up observations are encouraged, as well as checking the Kepler data.

Denis Denisenko
Member of MASTER team at SAI MSU