[vsnet-alert 15349] Superhump Period of MASTER OT J065608.28+744455.2 (ATEL)

Taichi Kato tkato at kusastro.kyoto-u.ac.jp
Wed Feb 6 09:54:52 JST 2013

   Forwarded ATEL message.  Further observations are encouraged.

Superhump Period of MASTER OT J065608.28+744455.2


ATEL #4786							     ATEL #4786

Title:	Superhump Period of MASTER OT
Author:	Peter Garnavich and Colin McClelland (Notre Dame)
Queries:	pgarnavi at gmail.com
Posted:	5 Feb 2013; 08:49 UT
Subjects:Optical, Binary, Cataclysmic Variable, Transient, Variables

We observed the optical transient MASTER OT J065608.28+744455.2 (ATEL #4783)
with the Vatican Advanced Technology Telescope (VATT) and VATT4K CCD camera.
V-band imaging began at 2013 Feb. 5.15 (UT) and continued for 3.3 hours
with a time resolution of 22 seconds. 

During the observations the OT was about 3 mag fainter than a comparison
star 1.8 arcmin to the east. The GSC (v2.3.2) shows a V magnitude of 13.23
for this comparison star. 

The VATT light curve shows a clear periodic oscillation with a full amplitude
of 0.12 mag and a period of approximately 1.35 +/- 0.03 hours based on
the two maxima and three minima observed. The variation is asymmetric,
with a faster rise than decline. The light curve suggests the presence
of superhump oscillations in an outbursting dwarf nova with an orbital
period about 80 minutes. 

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