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New Bright CV in Ursa Minor detected by MASTER

ATel #5643; D. Denisenko, E. Gorbovskoy, V. Lipunov, P. Balanutsa, N. Tiurina, V. Kornilov, A. Belinski, 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, S. Shurpakov, (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez, F. Podest (OAFA)
on 9 Dec 2013; 16:16 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Cataclysmic Variable, Transient

Referred to by ATel #: 7938

MASTER OT J162323.48+782603.3 - new bright CV

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 16h 23m 23.48s +78d 26m 03.3s on 2013-12-09.49575 UT. The OT unfiltered magnitude is 13.2m (limit 16.4m). The OT is seen in 13 images. The object has brightened to 13.0m by 2013-12-09.575 UT. We have reference image on 2011-10-07.51162 UT with OT at unfiltered magnitude 18.0 (limit 19.4m).

The object at quiescence is identical to the blue star USNO-A2.0 1650-01856527 (16 23 23.60 +78 26 02.1 R=18.3 B=18.2) = USNO-B1.0 1684-0061530 (16 23 23.378 +78 26 03.56 pmRA=-10 pmDE=24 B1=18.19 R1=18.20 B2=19.14 R2=18.91 I=18.30 ) = SDSS J162323.38+782603.6 (u=18.62 g=18.37 r=18.37 i=18.28 z=17.91). There is also an UV counterpart GALEX J162323.3+782603 (FUV=19.63+/-0.09 NUV=19.20+/-0.05). Finally, there is a faint X-ray source 2RXP J162322.7+782559 (0.00726 cnts/s) formally 5" away. There is nothing at this position in GCVS and AAVSO VSX. This area of sky in Ursa Minor is not covered by SDSS, CRTS and NEAT.

The object was included into the Atlas of Radio/X-ray associations (Flesch, 2010) with a 93% probability of being a quasar, 1% - a galaxy and 1% - a star. However, the proper motion (-10, 24) mas/yr which is evident between POSS-I and POSS-II plates taken in 1955 and 1995 respectively shows the object to be a star in our Galaxy and definitely not a QSO.

The object was also detected in outbursts to 13.3m by MASTER-Amur on 2012-11-19.551 and 2012-01-07.928 UT. Based on the blue color and outburst amplitude (~5m), MASTER OT J162323.48+782603.3 is 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/162323.48782603.3.png

List of Optical Transients discovered by MASTER

Global MASTER Robotic Net