New Bright CV discovered by MASTER

ATel #6117; V. Shumkov, D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, P. Balanutsa, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, V. Vladimirov, V. Yecheistov (Moscow State University, SAI), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress (Irkutsk State University), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov, A. Gabovich (Blagoveshchensk Educational University), A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk Solar Station of Pulkovo Observatory), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), P. Podvorotny, S. Shurpakov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez, F. Podest (OAFA)
on 5 May 2014; 11:01 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J210316.39+314913.6 - new bright CV

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 21h 03m 16.39s +31d 49m 13.6s on 2014-05-03.84978 UT. The OT unfiltered magnitude is 13.9m (limit 17.0m). The OT is seen in 11 images. There is no minor planet at this place. We have reference image without OT on 2012-08-28.56197 UT with unfiltered magnitude limit 18.6m.

The OT at quiescence is identical to the blue star USNO-A2.0 1200-16918984 (21 03 16.46 +31 49 14.1 R=16.0 B=16.1) = USNO-B1.0 1218-0550734 (21 03 16.453 +31 49 13.98 pmRA=0 pmDE=0 B1=15.57 R1=15.57 B2=19.38 R2=N/A I=17.20). Color-combined DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J210316+314913-OVR.jpg (10'x10' FOV). Object was in outburst on POSS-I blue and red plates taken on 1953-06-15 and at quiescnce on four other DSS images. Comparison of the 1st and 2nd epoch blue Palomar plates is uploaded to http://master.sai.msu.ru/static/OT/J210316+314913-POSS-B.jpg (5'x5' FOV).

There is nothing at this position in 2MASS, GCVS and AAVSO VSX. Galactic latitude is -9.8 deg. This area of sky in Cygnus is not covered by SDSS, NEAT and CRTS.

Based on the blue color and outburst amplitude (~5m), MASTER OT J210316.39+314913.6 is a new cataclysmic variable (dwarf nova). Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/210316.39314913.6.png (object was located within 60 pixels from the edge of 4kx4k CCD field of view).

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