Bright OT detected by MASTER

ATel #4783; D. Denisenko, P. Balanutsa, V. Lipunov, E. Gorbovskoy, 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, 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), S. Shurpakov, 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 3 Feb 2013; 18:17 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

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MASTER OT J065608.28+744455.2 - new bright CV

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 06h 56m 08.28s +74d 44m 55.2s on 2013-02-03.49473 UT. The OT unfiltered magnitude is 15.8m (limit 18.5m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2012-08-20.63529 UT with unfiltered magnitude limit 18.9m.

The object is also present on MASTER-Amur prediscovery image on 2013-01-20.46359 UT at unfiltered magnitude 14.3. Nothing was visible at this position on MASTER-Kislovodsk image on 2013-01-16.67162 UT (m_lim=19.4).

There is a faint star (magnitude ~21.5) visible on blue Palomar plates, but not on the red and infrared plates. The object has a likely UV counterpart GALEX J065608.2+744456 (FUV=N/A, NUV=22.24+/-0.31). This area of sky in Camelopardalis is not covered by NEAT, CRTS and SDSS.

Based on the amplitude of variability (more than 7m) and outburst duration (at least 2 weeks) we suggest that MASTER OT J065608.28+744455.2 is a new cataclysmic variable, most likely a dwarf nova of UGWZ type.

The discovery, prediscovery and reference images are available at: http://master.sai.msu.ru/static/OT/065608.28744455.2.png Follow up observations are required.

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