1365 Henyey
Main-belt asteroid
From Wikipedia, the free encyclopedia
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.[2][9]
| 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 | 2.5248 AU |
| Perihelion | 1.9723 AU |
| 2.2486 AU | |
| Eccentricity | 0.1229 |
| 3.37 yr (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±0.002 h[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] | |
Orbit and classification
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 in the inner main-belt at a distance of 2.0â2.5 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.[1] It was first Identified as A907 GK at Heidelberg in 1907. The body's observation arc begins with its official discovery observation in 1928.[9]
Physical characteristics
Rotation period
In August 2012, a first rotational lightcurve of Henyey was obtained from photometric observations by Daniel Klinglesmith at Etscorn Campus Observatory (719) in New Mexico. It gave a rotation period of 18.986 hours with a brightness variation of 0.23 magnitude (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 astronomer René Roy (U=2).[7]
Diameter and albedo
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.[4][5] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 â derived from 8 Flora, the largest member and namesake of the family â and calculates a diameter of 11.31 kilometers with an absolute magnitude of 11.9.[3]
Naming
Based on a suggestion by William Westbrooke, this minor planet was named after American astronomer Louis Henyey (1910â1970), known for his contributions in the field of stellar structure and stellar evolution. The lunar crater Henyey is also named in his honour.[2] The official naming citation was published by the Minor Planet Center on 20 February 1971 (M.P.C. 3143).[10]
Further reading
- Reddy, V.; Emery, J. P.; Gaffey, M. J.; Bottke, W. F.; Cramer, A.; Kelley, M. S. (January 2009). "Composition of 298 Baptistina: Implications for the K/T impactor link". Meteoritics & Planetary Science. 44 (12): 1917â1927. Bibcode:2009M&PS...44.1917R. doi:10.1111/j.1945-5100.2009.tb02001.x.
- Reddy, Vishnu; Carvano, Jorge M.; Lazzaro, Daniela; Michtchenko, Tatiana A.; Gaffey, Michael J.; Kelley, Michael S.; et al. (November 2011). "Mineralogical characterization of Baptistina Asteroid Family: Implications for K/T impactor source". Icarus. 216 (1): 184â197. arXiv:1110.3414. Bibcode:2011Icar..216..184R. doi:10.1016/j.icarus.2011.08.027. S2CID 118377061. Retrieved 22 November 2015.
