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New Bright CV detected by MASTER

ATel #5134; P. Podvorotny, D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, P. Balanutsa, V. Kornilov, A. Belinski, N. Shatskiy, V. Chazov, A. Kuznetsov, V. Yecheistov (Moscow State University, SAI), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov, A. Gabovich (Blagoveshchensk Educational University), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress, A. Frolova (Irkutsk State University), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk solar station of the Pulkovo observatory RAS), V. Shumkov, S. Shurpakov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (OAFA)
on 16 Jun 2013; 15:45 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Cataclysmic Variable, Transient

MASTER OT J194147.00+531847.7 - bright CV

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 19h 41m 47.00s +53d 18m 47.7s on 2013-06-15.58573 UT. The OT unfiltered magnitude is 15.6m (limit 18.0m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2012-07-27.59161 UT with unfiltered magnitude limit 19.0m.

This area of sky in Cygnus is not covered by SDSS, GALEX and CRTS. There is nothing at this position in USNO-A2.0, USNO-B1.0, GSC, 1RXS, GCVS and AAVSO VSX. There may be a faint (~21m) star hidden behind the diffraction spike of the nearby star USNO-B1.0 1433-0317963 (B2=12.70 R2=11.58 I=10.87) 15" to the east of the OT on the sum of digitized POSS plates and on combination of 6 Palomar/NEAT images taken on 2002 Sep. 24. Color-combined (BRIR) DSS image is posted at http://master.sai.msu.ru/static/OT/J194147+531847-BRIR5x5.jpg

Based on the outburst amplitude (more than 5m) we suggest that MASTER OT J194147.00+531847.7 is a new cataclysmic variable, likely a dwarf nova of UGSU subtype.

Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/194147.00531847.7.png

List of Optical Transients discovered by MASTER

Global MASTER Robotic Net