| Discovery[1] | |
|---|---|
| Discovered by | M. F. Wolf |
| Discovery site | Heidelberg Obs. |
| Discovery date | 9 September 1928 |
| Designations | |
| (1365) Henyey | |
Named after | Louis Henyey (American astronomer)[2] |
| 1928 RK · 1932 WL 1941 ME · 1973 YG4 1984 BA · A907 GK | |
| main-belt · Flora[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 109.96 yr (40,164 days) |
| Aphelion | 2.5248AU |
| Perihelion | 1.9723 AU |
| 2.2486 AU | |
| Eccentricity | 0.1229 |
| 3.37yr (1,232 days) | |
| 238.80° | |
| 0° 17m 32.28s / day | |
| Inclination | 5.0758° |
| 258.55° | |
| 337.32° | |
| Physical characteristics | |
| Dimensions | 10.31±1.91 km[4] 10.958±0.369 km[5] 11.31 km(calculated)[3] |
| 18.986±0.002h[6] 32.2±0.2 h[7] | |
| 0.24(assumed)[3] 0.26±0.13[4] 0.280±0.041[5] | |
| S[3] | |
| 11.80[5] · 11.9[1][3] · 12.01±0.26[8] · 12.10[4] | |
1365 Henyey, provisional designation1928 RK, is a stony Florianasteroid from the inner regions of theasteroid belt, approximately 11 kilometers in diameter. It was discovered by German astronomerMax Wolf atHeidelberg Observatory in southern Germany on 9 September 1928, and named for American astronomerLouis Henyey.[2][9]
Henyey is a member of theFlora family, a large population of stonyS-type asteroids in the inner main-belt. It orbits the Sun in theinner main-belt at a distance of 2.0–2.5 AU once every 3 years and 4 months (1,232 days). Its orbit has aneccentricity of 0.12 and aninclination of 5° with respect to theecliptic.[1] It was first Identified asA907 GK at Heidelberg in 1907. The body'sobservation arc begins with its official discovery observation in 1928.[9]
In August 2012, a first rotationallightcurve ofHenyey was obtained from photometric observations by Daniel Klinglesmith at Etscorn Campus Observatory (719) in New Mexico. It gave arotation period of 18.986 hours with a brightness variation of 0.23magnitude (U=2).[6] 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 astronomerRené Roy (U=2).[7]
According to the survey carried out by NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission,Henyey measures 10.31 and 10.96 kilometers in diameter and its surface has analbedo of 0.26 and 0.28. respectively.[4][5] TheCollaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from8 Flora, the largest member and namesake of the family – and calculates a diameter of 11.31 kilometers with anabsolute magnitude of 11.9.[3]
Based on a suggestion by William Westbrooke, thisminor planet was named after American astronomerLouis Henyey (1910–1970), known for his contributions in the field ofstellar structure andstellar evolution. The lunar craterHenyey is also named in his honour.[2] The officialnaming citation was published by theMinor Planet Center on 20 February 1971 (M.P.C. 3143).[10]
