1645 Waterfield is a main belt asteroid with an estimated diameter of about 15 km. It was discovered on July 24, 1933 by K. Reinmuth at Heidelberg. The semi-major axis is 3.06 AU, the eccentricity is 0.112 and the inclination is low 1.02 degrees.
I observed this asteroid on four nights during October and November 2003. The resulting data was very noisy and one night could not be used. A low-quality lightcurve was derived with a period of about 4.987 hours. However this result is very uncertain and more work is needed on this asteroid.