[vsnet-alert 15112] (ATEL) MASTER OT J082049.30+640307.6

[Taichi Kato]

ATEL #4593                                                           ATEL #4593

Title:  New bright CV with outburst amplitude 7m
Author: 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)
Queries:        lipunov2007 at gmail.com
Posted: 21 Nov 2012; 06:26 UT
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 
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: http://observ.pereplet.ru