Bright OT detected by MASTER on empty place

ATel #4686; S. Shurpakov, D. Denisenko, V. Lipunov, E. Gorbovskoy, P. Balanutsa, V. Yecheistov, 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 29 Dec 2012; 12:23 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

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MASTER OT J162314.36+650038.2 – CV? MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 16h 23m 14.36s +65d 00m 38.2s on 2012-12-27.84799 UT. The OT unfiltered magnitude is 16.6m (limit 17.9m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2012-06-24.68611 UT with unfiltered magnitude limit 18.5m.

Nothing is present at this position in USNO-B1.0, GSC 2.3.2, 2MASS, GALEX, 1RXS and GCVS catalogs, as well as in AAVSO VSX. This area of sky is not covered by SDSS and Palomar/NEAT. No previous outbursts were detected by Catalina Sky Survey.

Based on the amplitude of variability (at least 5m) we suggest that MASTER OT J162314.34+650036.5 is a new cataclysmic variable (dwarf nova) in outburst. Follow up observations are required.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/162314.36650038.2.png

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