Very Bright CV discovered by MASTER

ATel #5399; D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, P. Balanutsa, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, V. Yecheistov, V. Vladimirov (Moscow State University, SAI), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov, A. Gabovich (Blagoveshchensk Educational University), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress, A. Frolova (Irkutsk State 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, V. Shumkov, S. Shurpakov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (OAFA)
on 18 Sep 2013; 15:23 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

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MASTER OT J004527.52+503213.8 - new bright CV with large outburst amplitude

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 00h 45m 27.52s +50d 32m 13.8s on 2013-09-17.66803 UT. The OT unfiltered magnitude is 12.5m (limit 17.4m). The OT is seen in 4 images. There is no minor planet at this place. We have reference image without OT on 2012-09-24.68811 UT with unfiltered magnitude limit 19.3m.

The OT at quiescence is identical to the blue star USNO-B1.0 1405-0020846 (00 45 27.508 +50 32 15.56 B1=18.64 R1=19.27 B2=19.69 R2=19.95 I=19.30). Color-combined (BRIR) finder chart is uploaded to http://master.sai.msu.ru/static/OT/J004527+503213-BRIR.jpg (10'x10' FOV). There is also an UV counterpart GALEX J004527.5+503215 (NUV=19.27+/-0.12).

Nothing is present at this position in 1RXS, 2MASS, GCVS and AAVSO VSX. This area of sky in Cassiopeia is not covered by SDSS and CRTS. Object was at minimum light on 9 DSS plates and on 6 NEAT images of 2002 Sep. 24.

Based on the blue color and outburst amplitude, MASTER OT J004527.52+503213.8 is most likely a dwarf nova of WZ Sge (UGWZ) type in superoutburst. Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/004527.52503213.8.png

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