1798 Watts

1798 Watts, provisional designation, is a stony asteroid and binary system from the inner regions of the asteroid belt, approximately 7 kilometers in diameter.

It was discovered on 4 April 1949, by IU's Indiana Asteroid Program at Goethe Link Observatory near Brooklyn, Indiana, United States. The asteroid was named for American astronomer Chester Burleigh Watts. Its small minor-planet moon has a period of 26.96 hours.

Orbit and classification
Watts is a member of the Flora family, a large group of stony S-type asteroids in the inner main-belt. It orbits the Sun at a distance of 1.9–2.5 AU once every 3 years and 3 months (1,192 days). Its orbit has an eccentricity of 0.12 and an inclination of 6° with respect to the ecliptic. Watts was first observed and identified as at Yerkes Observatory in 1934, extending the body's observation arc by 15 years prior to its official discovery observation.

Spectral type
In the SMASS classification, Watts is characterized as a common stony S-type asteroid. It is also classified as a LS-type by PanSTARRS's photometric survey.

Diameter and albedo
According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Watts measures 6.63 kilometers in diameter and its surface has an albedo between 0.276 and 0.294. The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the largest member and namesake of this asteroid family – and calculates a diameter of 7.14 kilometers with an absolute magnitude of 12.9.

Moon and lightcurve
In February 2017, a rotational lightcurve of Watts was obtained from photometric observations by. Lightcurve analysis gave a rotation period of 3.5060 hours with a low brightness amplitude of 0.06 magnitude, indicating that the body has a spheroidal shape (U=n.a.).

During the photometric observations, a minor-planet moon was discovered, making Watts a binary asteroid. The satellite of the synchronous binary has an orbital period of 26.96 hours.

Naming
This minor planet was named in honour of American astronomer Chester Burleigh Watts (1889–1971), a graduate of Indiana University. He worked at the United States Naval Observatory for 44 years, making distinguished contributions in the field of positional astronomy and pioneered in the field of automation of transit circle observations, which led to results of the highest systematic accuracy. From the late 1940 until 1963 he meticulously mapped every feature on the marginal zone of the Moon. The official was published by the Minor Planet Center on 15 June 1973 (M.P.C. 3508).