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New Bright CV discovered by MASTER

ATel #4208; D. Denisenko, P. Balanutsa, V. Lipunov, E. Gorbovskoy, N. Tiurina, V. Kornilov, A. Belinski, N. Shatskiy, V. Chazov, A. Kuznetsov, D. Zimnukhov, D. Gareeva (Moscow State University, SAI) V. Krushinsky, I. Zalozhnih, A. Popov (Ural State University) K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress (Irkutsk State University) A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk solar station of the Pulkovo observatory RAS) V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov (Blagoveshchensk Educational University) P. Podvorotniy, S. Shurpakov, V. Shumkov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (Observatorio Astronomico Felix Aguilar; OAFA)
on 25 Jun 2012; 10:56 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Cataclysmic Variable

MASTER OT J211258.65+242145.4 - new CV

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 21h 12m 58.65s +24d 21m 45.4s on 2012-06-24.85937 UT. The OT unfiltered magnitude is 12.9m (limit 18.9m).

The OT is seen in 3 images with the following automatic unfiltered magnitudes:

2012-06-24 20:03:36 UT 12.85 2012-06-24 20:37:29 UT 12.94 2012-06-24 21:12:04 UT 12.90

We have MASTER-Kislovodsk reference image without OT on 2010-10-26 17:55:44 UT with unfiltered magnitude limit 19.3m.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/MASTER211258.65+242145.4.jpg

The object is present in USNO-B catalog as USNO-B1.0 1143-0518038 (RA=21 12 58.724 Dec=+24 21 45.58 pmRA=12 pmDE=-4 B1=19.73 R1=20.03 B2=20.78 R2=20.39) and in GALEX UV catalog as GALEX J211258.7+242145 (FUV=19.91+/-0.12 NUV=20.06+/-0.07). There is nothing at this position in 2MASS, GCVS and AAVSO VSX. This area is not covered by SDSS and CRTS.

We have checked archival Palomar/NEAT images available at SkyMorph website. Object was observed 36 times on 13 nights from June 2000 to July 2003. No previous outbursts were detected.

Based on the blue color and outburst amplitude (about 7 mag) we conclude that MASTER OT J211258.65+242145.4 is a dwarf nova of U Gem type, likely of UGWZ subtype. Follow up observations are required. 10'x10' color-combined (BRIR) DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J211258.65+242145.4-BRIR10x10.jpg

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