Detection of the UGSU-type nature of 
optical transient OT_J021110.2+171624 

 
On Jan 30th, 2008, Patrick Wils (Belgium) reported on cvnet-discussion the detection by the Catalina Sky Survey of an optical transient of mag 14.3 on Jan 29th, that was suspected to be an outburst of USNO-B1.0 1072-0031053 (position RA = 02:11:10.19, Decl = +17:16:24.4, J2000.0) , a star which is normally R=19.2. Patrick furthermore reported that brightenings were not seen on NEAT images, but the object appeared bright on 2 out of 9 POSSII images (a blue image from 1987.94 and a red image from 1990.88, while it was faint on red images 1 and 2 months before). 

Following Patrick's announcement, I started unfiltered CCD time-series observations of the new OT at CBA Belgium Observatory on Jan 30.833 UT, 2008, using a 0.35-m f/6.3 telescope and ST-7XME CCD camera. Sky conditions were good, and the session lasted for 2 hours. The resulting light curve is presented below and shows a superhump-like structure with an amplitude of 0.15 mag. Given the short duration of the session, it's difficult to accurately establish the hump period. Using Peranso's implementation of the ANOVA method, I find a value of 0.06 +/- 0.01 d. 

Light curve of OT_J021110.2+171624, after removing a linear trend of decline. 
The object was observed through a 2.3 airmass towards the latter part of the session.