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THE ASTRONOMER Electronic Circular No 2883      2012 Dec 23 17.13UT
Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise,  Basingstoke,
Hants, RG22 4PP,England.Telephone/FAX(01256)471074Int:+441256471074
INTERNET: GUY@TAHQ.DEMON.CO.UK      Backup: gmh@wdcc1.bnsc.rl.ac.uk
WORLD WIDE WEB                         http://www.theastronomer.org
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MASTER OT J202225.43+511248.0 - new bright CV
V. Shumkov et. al., Moscow State University relays on ATEL 4664 that the 
MASTER-Amur auto-detection system discovered an optical transient (OT) 
source on 2012 Dec 20.477UT at:

RA 20h 22m 25.43s DEC +51d 12' 48.0" (2000)

The OT unfiltered magnitude is 15.7m (limit 17.8m) and it is seen on 3 
images. There is no minor planet at this place. They have a reference 
image without the OT on 2011 Oct 25.411UT with magnitude limit in 'V' 
filter 18.3m.

Nothing is present at this position in 2MASS, USNO-B1.0, GSC, 1RXS, GCVS 
catalogs and in AAVSO VSX. This area of sky is not covered by SDSS, CRTS 
and GALEX. No previous outbursts were detected on 6 Palomar/NEAT images 
obtained on 2002 Sep. 24. There is a faint blue star visible on 
digitised Palomar plates (magnitude ~21.5). A colour-combined finder 
chart is uploaded to 
http://master.sai.msu.ru/static/OT/J202225+511248-BRIR5x5.jpg

Based on the amplitude (about 6 magnitudes), we conclude that MASTER OT 
J202225.43+511248.0 is a new cataclysmic variable (dwarf
nova) in outburst, likely a superoutburst.

The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/202225.43511248.0.png

Guy M Hurst