Bright OT with 7m outburst amplitude detected by MASTER

ATel #4881; D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, P. Balanutsa, V. Kornilov, A. Belinski, N. Shatskiy, V. Chazov, A. Kuznetsov, V. Yecheistov, D. Zimnukhov (Moscow State University, SAI), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov, A. Punanova (Ural Federal 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 the Pulkovo observatory RAS), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov (Blagoveshchensk Educational University), P. Podvorotny, V. Shumkov, S. Shurpakov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (OAFA)
on 12 Mar 2013; 21:59 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

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MASTER OT J165236.22+460513.2 - new bright CV

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 16h 52m 36.22s +46d 05m 13.2s on 2013-03-12.83868 UT. The OT unfiltered magnitude is 14.8m (limit 18.4m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2012-06-20.62133 UT with unfiltered magnitude limit 18.7m.

The object is located within 2" from the star SDSS J165236.28+460515.1 (u=21.97 g=22.10 r=21.87 i=21.29 z=20.85). No previous outbursts were detected by Catalina Sky Survey. There is nothing at this position in 1RXS, USNO-B1.0, GSC, 2MASS, GCVS and AAVSO VSX. This area of sky in Hercules is not covered by Palomar/NEAT and GALEX.

Based on the outburst amplitude (~7m) we conclude that MASTER OT J165236.22+460513.2 is a new cataclysmic variable, likely a dwarf nova of UGWZ (WZ Sge) subtype.

Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/165236.22460513.2.png

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