Two possible CV detected by MASTER

ATel #6879; O. Gress (Irkutsk), V. Shumkov(Ural), D. Buckley (SAAO, South African Astronomical Observatory), V. Lipunov, S. Antipin, E. Gorbovskoy, V. Kornilov, N. Tiurina, P. Balanutsa, A. Kuznetsov, D. Denisenko (Moscow State University, SAI), S. Potter, A. Kniazev, M. Kotze (SAAO), K. Ivanov, S. Yazev, N. Budnev, V. Poleshchuk, E. Konstantinov (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, V. Gabovich (Blagoveshchensk Educational University), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University) S. Shurpakov (MASTER team members)
on 6 Jan 2015; 10:03 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

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MASTER OT J150948.78-472953.6 - first MASTER-South African Astronomical Observatory possible CV detection

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 15h 09m 48.78s -47d 29m 53.6s on 2015-01-03.0761 UT with 15.3m unfiltered magnitude (the limit is 18.2m).

The OT is seen in number images and decreased:

Date                               m        error

20150103.07186        15.29 0.03
20150103.07658        15.32 0.03
20150103.08066        15.26 0.03
20150104.00672        15.96 0.1
20150104.00672        15.84 0.08
20150106.01409        16.68 0.14
20150106.01410        16.60 0.11
20150106.03988       16.74 0.11
20150106.03988       16.69 0.1
20150106.04057        16.65 0.07
20150106.04057       16.59 0.06
20150106.04078       16.58 0.1
20150106.04218       16.73 0.11
20150106.04219       16.53 0.1
20150106.04306       16.59 0.1
20150106.04307       16.68 0.11
20150106.04376       16.62 0.1
20150106.04474       16.68 0.07
20150106.04474       16.56 0.11
20150106.04543       16.71 0.07
20150106.04559       16.83 0.13
20150106.04560       16.62 0.1
20150106.04716       16.65 0.11
20150106.04716       16.86 0.11
20150106.04925       16.72 0.05
20150106.04916       16.69 0.07
20150106.04916       16.72 0.07
20150106.05205       16.75 0.09
20150106.05206       16.74 0.07
20150106.07181       16.74 0.11

We have reference image without OT on 2015-01-01.077 UT with unfiltered magnitude limit 18.9m. There is no minor planet at this place.

This star is identical to USNO B1.0 0425-0525969 with B2=19.98, R2=17.61, I=17.18. Nothing is present at this position in AAVSO VSX.

The possible type of OT is SS Cyg.

Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/J150948.78-472953.6.jpg

MASTER OT 064334.81+741014.7 - possible CV

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 06h 43m 34.81s +74d 10m 14.7s on 2015-01-04.460 UT. 16.2 unfiltered magnitude (the limit is18.2m).

The OT is seen in 4 images. There is no minor planet at this place.

We have about 160 reference images without OT at MASTER-Kislovodsk, -Tunka and -Amur database from 2010-11-13.746UT with 19.9m unfiltered magnitude limit up to 2015-01-04.460 UT. The amplitude of variability is about 4m.

Follow up observations are required.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/064334.81+741014.jpg

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