Volume 50 number 2 (2022)
CCD BVRI light curves of UU Cam were taken on 19, 20, 21, 23, 24, and 27 January 2021 by Daniel Caton at the Dark Sky Observatory, North Carolina, with the 0.81-m reflector of Appalachian State University. The variability of UU Cam was discovered by Baker. UU Cam is an eclipsing binary with a totally eclipsing secondary. The eclipse duration is some 54 minutes. The period behavior is quadratic following JD 2454860. Before this, there appears to be a constant period or the scatter is very high. There are 34 timings in the period study covering an interval of ~29.6 years. From our study, the period is found to be increasing. This could be due to mass transfer making the mass ratio decrease. A Wilson-Devinney analysis reveals that the system is an A-type (most massive component is the hottest) W UMa binary with a fairly extreme mass ratio, q = 0.2551 ± 0.0002. Its Roche Lobe fill-out is an extreme ~60%. One cool spot was needed in the solution. The temperature difference of the components is only ~121 K. The inclination is high, 82.04 ± 0.05, resulting in a time of constant light in the primary eclipse.