Аннотация: MASTER OT J172304.13-804710.0 discovery - Dwarf Nova flare, Amplitude >4m
MASTER-SAAO auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 17h 23m 04.13s -80d 47m 10.0s on 2015-05-03.95650 UT.
The OT unfiltered magnitude is 16.7m (the limit is 18.7m).
There are 6 images with OT on 2015-05-03.956UT - 2015-05-03.991UT. There are 2 images with OT on 2015-05-01.956 and 2015-03-01.991UT with m_OT=16.7. There is no minor planet at this place.
We have reference images without OT on 2015-04-11.951UT with 19.7 unfiltered magnitude limit, on 2014-12-17.953 with m_lim=19.4.
There is a USNO-B1 star with R1=20.08, B2=20.74. There was last flare in 1980.783 (Usno-A2.0).
Spectral observations are required.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/172304.13-804710.0.png