Possible Cataclysmic Variable in Sagittarius discovered by MASTER

ATel #6701; V. Vladimirov, D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, P. Balanutsa, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, E. Popova (Lomonosov Moscow State University, SAI), A. Tlatov, D. Dormidontov, V. Senik, A. Parkhomenko (Kislovodsk Solar Station of Pulkovo Observatory), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress (Irkutsk State University), V. Yurkov, A. Gabovich, Y. Sergienko, E. Sinyakov (Blagoveshchensk Educational University), V. Shumkov, S. Shurpakov (MASTER team members)
on 15 Nov 2014; 12:42 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J191904.96-100652.5 - possible new CV

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 19h 19m 04.96s -10d 06m 52.5s on 2014-11-13.63007 UT. The OT unfiltered magnitude is 17.0m (limit 18.3m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2012-07-15.91687 UT with unfiltered magnitude limit 18.2m.

There is nothing at this position in any catalogs and on DSS plates to the limiting magnitude ~21. Color-combined finder chart is uploaded to http://master.sai.msu.ru/static/OT/J191904-100652-ORIR5x5.jpg (2x zoom). Galactic latitude is -11 deg. This area of sky in Sagittarius is not covered by SDSS, GALEX, NEAT and Catalina Sky Survey.

Based on the amplitude of variability (at least 4m), MASTER OT J191904.96-100652.5 is likely a new cataclysmic variable (dwarf nova in outburst). Follow up observations are encouraged. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/191904.96-100652.5.png

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