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New Bright CV in Hercules discovered by MASTER

ATel #4324; D. Denisenko, V. Lipunov, N. Tiurina, P. Balanutsa, E. Gorbovskoy, 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), V. Shumkov, S. Shurpakov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (Observatorio Astronomico Felix Aguilar; OAFA)
on 21 Aug 2012; 15:24 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Request for Observations, Cataclysmic Variable, Transient

Referred to by ATel #: 4330

MASTER OT J174902.10+191331.2 - new bright CV

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 17h 49m 02.10s +19d 13m 31.2s on 2012-08-21.51684 UT. The OT unfiltered magnitude is 13.3m (limit 17.4m). The OT is also seen in 2 images taken on 2012-08-20.542 and 20.573 UT with the same unfiltered magnitude 13.3. Nothing was visible at this position on the unfiltered image of 2012-08-19.521 UT to the limiting magnitude 17.5m.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/J17490210+1913312.jpg

There is nothing at this position in 2MASS, GCVS and AAVSO VSX. This area is not covered by GALEX, SDSS and CRTS.

There is a star in USNO-B1.0 catalog within 2" of the OT named USNO-B1.0 1092-0283596 with the following coordinates, proper motions and magnitudes:
17 49 02.087 +19 13 29.52 pmRA=0 pmDE=0 B1=20.29 R1=18.64 B2=20.06 R2=17.79 I=18.64

This area was observed by the NEAT project on 12 nights from 1998 June 24 to 2005 Aug. 30. In total 36 images were taken. The object was in outburst on 2003 Aug. 07 and then again on 2005 Aug. 13 and 30, but at quiescence on all other images.

Based on the amplitude of variability, short rise time and presence of previous outbursts we conclude that MASTER OT J174902.10+191331.2 is a new cataclysmic variable (dwarf nova). Follow up observations are encouraged.

10'x10' color-combined (BRIR) DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J1749+1913-BRIR10x10.jpg

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