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ATEL # 1757; A. W. Shafter, Z. R. J. Girazian, E. Marin, C. M. Heffner, M. Fernandez (SDSU)
on 3 Oct 2008; 21:05 UT
Password Certification: Allen W. Shafter (firstname.lastname@example.org)
Subjects: Optical, Cataclysmic Variables, Transients
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.