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New CV in Cepheus detected by MASTER

ATel #5660; D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, P. Balanutsa, V. Kornilov, A. Belinski, N. Shatskiy, V. Chazov, A. Kuznetsov, A. Rufanov, V. Vladimirov, V. Yecheistov (Moscow State University, SAI), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress (Irkutsk State University), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov, A. Gabovich (Blagoveshchensk Educational 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, F. Podest (OAFA)
on 14 Dec 2013; 08:51 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Cataclysmic Variable, Transient

MASTER OT J023929.34+784838.3 - new CV

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 02h 39m 29.34s +78d 48m 38.3s on 2013-12-13.58947 UT. The OT unfiltered magnitude is 16.1m (limit 17.8m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2011-11-30.62846 UT with unfiltered magnitude limit 19.4m.

The OT at quiescence is identical to the star USNO-B1.0 1688-0014289 (02 39 29.302 +78 48 38.58 B1=19.79 R1=19.14 B2=17.47 R2=18.99 I=18.72) = USNO-A2.0 1650-00522197 (02 39 29.57 +78 48 38.2 R=17.8 B=19.4). The star has brightened on 1996-08-13 blue Palomar plate, faded on 1996-08-21 IR plate and was detected in bright outburst on 1996-09-04 infrared plate. Color-combined finder chart is uploaded to http://master.sai.msu.ru/static/OT/J023929+784838-BRIR.jpg (10'x10' FOV).

The OT has an UV counterpart GALEX J023929.1+784838 (FUV=18.43+/-0.06 NUV=18.31+/-0.04). There is nothing at this position in 1RXS, 2MASS, GCVS and AAVSO VSX. This area of sky in Cepheus is not covered by SDSS, CRTS and NEAT.

Based on the color, UV detection, amplitude of variability (~3m) and short outburst cycle implied by 1996 Palomar plates, MASTER OT J023929.34+784838.3 is a cataclysmic variable, likely a dwarf nova of Z Cam (UGZ) type in outburst. Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/023929.34+784838.3.jpg

List of Optical Transients discovered by MASTER

Global MASTER Robotic Net