Bright OT detected by MASTER

ATel #4675; S. Shurpakov, D. Denisenko, P. Balanutsa, V. Lipunov, E. Gorbovskoy, N. Tiurina, V. Kornilov, A. Belinski, N. Shatskiy, V. Chazov, A. Kuznetsov, 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 (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), V. Shumkov, P. Podvorotny, (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (Observatorio Astronomico Felix Aguilar; OAFA)
on 24 Dec 2012; 08:07 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

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MASTER OT J211322.92+260647.4 - new bright CV

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 21h 13m 22.92s +26d 06m 47.4s on 2012-12-21.46578 UT. The OT unfiltered magnitude is 15.2m (limit 16.1m). The OT is seen in 4 images. We have reference image without OT on 2011-08-21.64619 UT with unfiltered magnitude limit 19.6m.

There is a faint star at the position of OT on blue digitized POSS plates. Color-combined finder chart is uploaded to http://master.sai.msu.ru/static/OT/J211322+260647-BRIR5x5.jpg The star is present in GSC 2.3.2 with the coordinates (J2000.0) 21 13 22.953 +26 06 47.02 and magnitude Jmag=21.69. It is also identical to the UV source GALEX J211322.8+260647 (FUV=21.97+/-0.31, NUV=22.84+/-0.48).

Nothing is present at this position in 2MASS, USNO-B1.0, 1RXS, GCVS catalogs and in AAVSO VSX. This area of sky is not covered by SDSS and CRTS. No previous outbursts were detected on 9 Palomar/NEAT images obtained on 2001 Aug. 12, 18 and 2002 July 27.

Based on the amplitude of variability (more than 6m) we conclude that MASTER OT J211322.92+260647.4 is a new cataclysmic variable of SU UMa or WZ Sge type in superoutburst. Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/211322.92260647.4.png

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