[vsnet-alert 16831] MASTER OT J180539.49+342329.1 - new UGSU candidate in Hercules (16.1m)

Denis Denisenko d.v.denisenko at gmail.com
Mon Jan 27 21:15:01 JST 2014


Sergey Shurpakov has found new large-amplitude CV in Hercules among
MASTER-Tunka transients from the last night. It was published in ATel
#5819, http://www.astronomerstelegram.org/?read=5819

MASTER OT J180539.49+342329.1
  20140126.922   163C   MASTER-Tunka
  20140126.923   161C   MASTER-Tunka
  20140126.960   163C   MASTER-Tunka
  20140126.961   160C   MASTER-Tunka
  20140126.962   161C   MASTER-Tunka
Formal errors of photometry are 0.1m.

Discovery and reference images:
http://master.sai.msu.ru/static/OT/180539.49342329.1.png

There is nothing at this position on the sum of six Palomar plates to
the limiting magnitude ~22. Color-combined DSS finder chart
(BRIR+OVR): http://master.sai.msu.ru/static/OT/J180539+342329-BRIR5x5.jpg
(2x zoom)

Amplitude of outburst is at least 6m. The object is most likely a
dwarf nova of SU UMa (UGSU) type in superoutburst, maybe even an UGWZ.
Time-resolved photometry is encouraged.

Object is currently at 65 deg elongation from the Sun, so the
observing conditions are difficult. However, there are several hours
of morning visibility in high northern latitudes (Russia, Scandinavia,
Canada) and the orbital period is expected to be short.

Denis Denisenko
Member of MASTER team at SAI MSU


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