Advisor: Dr. Stephen M. Slivan

The rotation period of the asteroid 202 Chryseis is currently unknown. Measuring the rotation period of an asteroid is a necessary first step in determining its reflectance as a function of solar phase angle, which can yield information about is composition and structure. Observational data were collected in February and March of 2000 using the 16” telescope at the Foggy Bottom Observatory at Colgate University. On-chip differential photometry was the primary method used for data reduction. Initial results show that either the period is greater than 16 hours and/or the light curve has an amplitude of less than 0.15 magnitudes. In order to determine the period it will be necessary to connect several nights’ data to create a composite light curve free of all interfering brightness variations, which would then allow for Fourier analysis of the rotational variations in brightness.