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500th Optical Transient discovered by MASTER

ATel #5900; 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), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov, A. Gabovich (Blagoveshchensk Educational 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 Pulkovo Observatory), 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 18 Feb 2014; 15:09 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Cataclysmic Variable, Transient

MASTER OT J065921.17+102943.0 - possible Cataclysmic Variable

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 06h 59m 21.17s +10d 29m 43.0s on 2014-02-18.50572 UT. The OT unfiltered magnitude is 15.6m (limit 17.5m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2012-09-24.83476 UT with unfiltered magnitude limit 18.3m.

The OT at quiescence is identical to the blue star USNO-B1.0 1004-0122737 (06 59 21.152 +10 29 43.43 pmRA=8 pmDE=-8 B1=19.35 R1=N/A B2=19.40 R2=17.19 I=18.75). Color-combined (BRIR) finder chart is uploaded to http://master.sai.msu.ru/static/OT/J065921+102943-BRIR5x5.jpg (2x zoom). The object is showing the large variability between 1st and 2nd epoch Palomar plates. Comparison of POSS-I and POSS-II red plates is posted at http://master.sai.msu.ru/static/OT/J065921+102943-POSS-Red.jpg

There is nothing at this position in 1RXS, 2MASS, GCVS and AAVSO VSX. This area of sky in Monoceros is not covered by GALEX, SDSS and CRTS.

Based on the proper motion and amplitude of variability, MASTER OT J065921.17+102943.0 is most likely a cataclysmic variable. Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/065921.17102943.0.png

List of 500 Optical Transients discovered by MASTER

Global MASTER Robotic Net