Time-resolved Photometry of the Recently-discovered SU UMa Star, OT J011306.7+215250
ATel #1757; A. W. Shafter, Z. R. J. Girazian, E. Marin, C. M. Heffner, M. Fernandez (SDSU)
on 3 Oct 2008; 21:05 UT
Credential Certification: Allen W. Shafter (aws@nova.sdsu.edu)
Subjects: Optical, Cataclysmic Variable, Transient
We report the results of time-resolved CCD photometry
obtained with the Mount Laguna Observatory 1-m reflector
of the SU UMa star OT J011306.7+215250, which was discovered
on 2008 Sep 22 UT by Drake et al. (ATel #1734) as part of the
Catalina Real-time Transient Survey.
A total of ~25 hours of V-band photometry over 5 nights
(2008 Sep 25 - 29 UT) has enabled us to confirm its
SU UMa nature, and to establish a revised superhump period
of 0.09445(3) days (136.0 minutes), which is one of the longest
superhump periods known.
During our observations the system faded quite rapidly,
by almost a magnitude per day,
from V~15.5 on Sep 25.2 to V~19 on Sep 29.3 UT.
Perhaps surprisingly, the superhump amplitude
increased over the same time interval,
from ~0.1 mag on our first night,
to ~0.4 mag when the system reached V~19 on our last night
of observation.