[vsnet-alert 15034] New UGWZ candidate MASTER OT J081110.46+660008.5

[Denis Denisenko]

Just published in ATel #4506, <http://www.astronomerstelegram.org/?read=4506>:

MASTER OT J081110.46+660008.5 - new bright CV with outburst amplitude 8m

Discovered by MASTER-Amur on two survey images taken on 2012-10-20.761
and 20.793 UT. Unfiltered magnitudes:

  20121020.761  142CR  MASTER-Amur
  20121020.793  141CR  MASTER-Amur

The OT is identical to the star SDSS J081110.43+660010.3 with blue
colors: u=22.42 g=22.07 r=22.11 i=22.16 z=22.26. The new variable has
also an UV counterpart with two entries in GALEX catalog: GALEX
J081110.7+660013 (FUV=21.31+/-0.49 NUV=20.84+/-0.26) and GALEX
J081110.8+660013 (FUV=21.71+/-0.48 NUV=21.18+/-0.29). The star is
showing variability on blue Palomar plates. According to USNO-B1.0, it
had B=18.98 on 1955-01-28 POSS-I plate and B=20.51 on 1997-02-05
POSS-II plate.

The discovery and reference images are available at
http://master.sai.msu.ru/static/OT/081110.46660008.5.png and the
comparison of MASTER-Amur, DSS red and SDSS color images is uploaded
to http://master.sai.msu.ru/static/OT/081110.4+660008.jpg

This is likely a dwarf nova of WZ Sge (UGWZ) type. Follow up
observations are required. Star is in the westernmost part of Ursa
Major, about 8' from the Camelopardalis border.

Denis Denisenko