5692 Shirao
| Discovery | |
|---|---|
| Discovered by |
K. Endate K. Watanabe |
| Discovery site | Kitami Obs. |
| Discovery date | 23 March 1992 |
| Designations | |
| MPC designation | (5692) Shirao |
|
Named after
|
Motomaro Shirao (geologist, photographer) |
| 1992 FR · 1949 KK 1966 FO · 1966 FS 1970 CH · 1976 SN2 1979 HT2 · 1979 HV1 1985 UW2 · 1989 SO9 |
|
| main-belt · Eunomia | |
| Orbital characteristics | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 67.45 yr (24,635 days) |
| Aphelion | 3.1374 AU |
| Perihelion | 2.1728 AU |
| 2.6551 AU | |
| Eccentricity | 0.1816 |
| 4.33 yr (1,580 days) | |
| 241.59° | |
| 0° 13m 40.08s / day | |
| Inclination | 11.931° |
| 181.79° | |
| 44.221° | |
| Physical characteristics | |
| Dimensions | 9.17 km (calculated) 9.548±0.155 9.75±0.30 km 9.811±0.063 km |
|
2.886±0.002 h 2.8878±0.0004 h 2.90±0.02 h (ii) |
|
| 0.21 (assumed) 0.2218±0.0290 0.223±0.030 |
|
| S | |
| 12.3 · 12.47±0.25 · 12.5 | |
5692 Shirao, provisional designation 1992 FR, is a stony Eunomia asteroid from the middle region of the asteroid belt, approximately 9 kilometers in diameter. It was discovered on 23 March 1992, by Japanese amateur astronomers Kin Endate and Kazuro Watanabe at Kitami Observatory, Hokkaidō, Japan.
The asteroid is a member of the Eunomia family, a large group of stony S-type asteroids and the most prominent family in the intermediate main-belt. It orbits the Sun at a distance of 2.2–3.1 AU once every 4 years and 4 months (1,580 days). Its orbit has an eccentricity of 0.18 and an inclination of 12° with respect to the ecliptic. The first used precovery was taken at the U.S. Palomar Observatory in 1955, extending the asteroid's observation arc by 37 years prior to its discovery.
In June 2014, a rotational light-curve for this asteroid was obtained from photometric observations made by American astronomer Brian D. Warner at the U.S. Palmer Divide Observatory in Colorado. It gave a well-defined rotation period of 2.8878±0.0004 hours with a brightness variation of 0.16 in magnitude (U=3). Previous light-curves were obtained by French astronomer René Roy (2.90±0.01 hours, Δ 0.13 mag, U=2) in June 2001, by American astronomer Donald P. Pray (2.886±0.002 hours, Δ 0.12 mag, U=2) in March 2005, and by astronomers Dominique Suys, Hugo Riemis and Jan Vantomme (2.90±0.01 hours, Δ 0.15 mag, U=2+) in September 2006.
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