Superhump Period of MASTER OT
ATel #4786; Peter Garnavich and Colin McClelland (Notre Dame)
on 5 Feb 2013; 08:49 UT
Credential Certification: Peter Garnavich (pgarnavi@gmail.com)
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.
