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Two OTs discovered by MASTER and one Eartum to ATel #4428

ATel #4429; N. Tiurina, D. Denisenko, P. Balanutsa, P. Podvorotny, S. Shurpakov, E. Gorbovskoy, V. Lipunov, 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, (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (Observatorio Astronomico Felix Aguilar; OAFA)
on 27 Sep 2012; 14:17 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Cataclysmic Variable, Supernovae, Variables

OT MASTER J034757.12+744221.7 - new Dwarf Nova or SN

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 03h 47m 57.12s +74d 42m 21.7s on 2012-09-25.95586 UT. The OT unfiltered magnitude is 18.1m (limit 19.3m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2010-09-21.00186 UT with unfiltered magnitude limit 19.4m.

There is a faint blue star (magnitude ~22) marginally visible at the position of the OT on the combination of 6 POSS-II plates. There is nothing at this position in USNO-B1.0, 2MASS, GALEX, 1RXS and GCVS catalogs. This area is not covered by SDSS, CSS and NEAT.

The galactic latitude is 16 deg. Based on the amplitude of variability and presence of previous detection by MASTER we suggest that MASTER OT J034757.12+744221.7 is likely a cataclysmic variable (dwarf nova) in outburst.

Follow up observations are requested.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/034757.12744221.7.png

OT MASTER J045337.76+534047.3 - New CV

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 04h 53m 37.76s +53d 40m 47.3s on 2012-09-26.98581 UT. The OT unfiltered magnitude is 17.1m (limit 19.2m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2010-12-10.83711 UT with unfiltered magnitude limit 21.4m.

The star was in outburst on the POSS-II Blue plate taken on 1990 Oct. 16 and not visible on five other Palomar plates. It is present in GSC 2.3.2 catalog with coordinates 04 53 37.834 +53 40 47.34 and jmag=18.81.

Nothing is present at this position in USNO-B1.0, 2MASS, 1RXS and GCVS catalogs. This area is not covered by CRTS, GALEX, SDSS and Palomar/NEAT.

Based on the amplitude of variability we conclude that MASTER J045337.76+534047.3 is the new cataclysmic variable (dwarf nova) in outburst.

Spectral observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/045337.76534047.3.png

MASTER OT J045804.40+212306.8

MASTER OT J045804.40+212306.8 ( ATel #4428) is the Jovian satellite J6 Himalia (John Greaves, private communication). We are very sorry.

Global MASTER Robotic Net