New Large-Amplitude CV in Hercules detected by MASTER

ATel #5819; S. Shurpakov, D. Denisenko, V. Lipunov, E. Gorbovskoy, P. Balanutsa, N. Tiurina, V. Kornilov, 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), A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk Solar Station of Pulkovo Observatory), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov, A. Gabovich (Blagoveshchensk Educational University), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), P. Podvorotny, V. Shumkov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez, F. Podest (OAFA)
on 27 Jan 2014; 11:54 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

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MASTER OT J180539.49+342329.1 - new large-amplitude CV

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 18h 05m 39.49s +34d 23m 29.1s on 2014-01-26.92191 UT. The OT unfiltered magnitude is 16.3m (limit 17.8m). The OT is seen in 5 images. There is no minor planet at this place. We have reference image without OT on 2011-04-05.79133 UT with unfiltered magnitude limit 20.2m.

There is nothing at this position in 1RXS, USNO, GSC, 2MASS, GCVS and AAVSO VSX. Object is not visible on the sum of digitized Palomar plates to the limiting magnitude ~22m. Color-combined DSS finder chart (sum of POSS-II BRIR, POSS-I OR and Quick-V plates) is uploaded to http://master.sai.msu.ru/static/OT/J180539+342329-BRIR5x5.jpg (2x zoom). There is a faint UV counterpart marginally detected by GALEX in near-ultraviolet only: GALEX J180539.6+342328 (FUV=N/A NUV=22.47+/-0.46). No previous outbursts were detected by Catalina Sky Survey.

Based on the amplitude of variability (at least 6m), MASTER OT J180539.49+342329.1 is a new cataclysmic variable, most likely a dwarf nova of SU UMa (UGSU) type in superoutburst. Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/180539.49342329.1.png

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