Discovered by M. Wolf MPC designation 1365 Henyey Discovered 9 September 1928 Discoverer Max Wolf Asteroid group Asteroid belt | Discovery date 9 September 1928 Minor planet category main-belt · Flora Orbits Sun Asteroid family Flora family | |
Named after Louis Henyey (astronomer) Alternative names 1928 RK · 1932 WL
1941 ME · 1973 YG4
1984 BA · A907 GK Discovery site Landessternwarte Heidelberg-Königstuhl Similar 528 Rezia, 417 Suevia, 509 Iolanda, 540 Rosamunde, 484 Pittsburghia | ||
1365 Henyey, provisional designation 1928 RK, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 11 kilometers in diameter. It was discovered by German astronomer Max Wolf at Heidelberg Observatory in southern Germany on 9 September 1928, and named for American astronomer Louis Henyey.
Description
Henyey is a member of the Flora family, a large population of stony S-type asteroids in the inner main-belt. It orbits the Sun at a distance of 2.0–2.5 AU once every 3 years and 4 months (1,232 days). Its orbit has an eccentricity of 0.12 and an inclination of 5° with respect to the ecliptic. It was first Identified as A907 GK at Heidelberg in 1907. The body's observation arc, however, begins with its official discovery observation in 1928.
In August 2012, a first rotational light-curve of Henyey was obtained from photometric observations by Daniel Klinglesmith at Etscorn Campus Observatory in New Mexico. It gave a rotation period of 18.986 hours with a brightness variation of 0.23 magnitude (U=2). In November 2016, a divergent period solution of 32.2 hours with a change in brightness of 0.32 magnitude was found by French amateur astronomer René Roy (U=2).
According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Henyey measures 10.31 and 10.96 kilometers in diameter and its surface has an albedo of 0.26 and 0.28. respectively. The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the largest member and namesake of the family – and calculates a diameter of 11.31 kilometers, using an absolute magnitude of 11.9.
This minor planet was named after American astronomer Louis Henyey (1910–1970), known for his contributions in the field of stellar structure and stellar evolution. Naming was suggested by William Westbrooke. The lunar crater Henyey is also named in his honour. Naming citation was published before November 1977 (M.P.C. 3143).