Named for Chester B. Watts {1889–1971}, a graduate of Indiana University (AB 1915, Honorary D.Sc. 1953). Dr. Watts made distinguished contributions in the field of positional astronomy during his 44 years at the U.S. Naval Observatory. He pioneered in the field of automation of transit circle observations, leading to results of the highest systematic accuracy. Culminating his career was the monumental task of mapping every feature on the marginal zone of the Moon, which he commenced in the late 1940’s and completed in 1963, four years after his normal retirement. (M 3508) _ _.