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New bright CV with outburst amplitude 7m

ATel #4593; D. Denisenko, P. N. Tiurina, E. Gorbovskoy, N. Tiurina, V. Lipunov, 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), P. Podvorotny, S. Shurpakov, V. Shumkov, (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (Observatorio Astronomico Felix Aguilar; OAFA)
on 21 Nov 2012; 06:26 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Cataclysmic Variable

MASTER OT J082049.30+640307.6 - new bright CV with outburst amplitude 7m

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 08h 20m 49.30s +64d 03m 07.6s on 2012-11-20.65846 UT. The OT unfiltered magnitude is 14.2m (limit 18.5m). The OT is seen in 2 images. There is no minor planet at this place.

We have reference image without OT on 2011-02-08.59435 UT with unfiltered magnitude limit 19.4m. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/082049.30640307.6.png

There is nothing at this position in 2MASS, USNO-B1.0, GSC 2.3.2, GALEX, 1RXS and GCVS catalogs, as well as in AAVSO VSX. No previous outbursts were detected by CRTS. This area of sky is not covered by SDSS and NEAT. The faint star (magnitude B~21) is visible on blue Palomar plates at the following position (J2000.0): 08 20 49.11 +64 03 09.2 (1955-01-28), 08 20 49.28 +64 03 08.4 (1997-02-05). Comparison of 1955 and 1997 POSS plates is posted at http://master.sai.msu.ru/static/OT/J082049+640307-DSS-Blue.jpg

Based on the amplitude of variability (~7m) and proper motion of the progenitor we conclude that MASTER OT J082049.30+640307.6 is a new cataclysmic variable of UGSU or UGWZ type in outburst.

Follow up observations are required.

Global MASTER Robotic Net