4585 Ainonai
| Discovery | |
|---|---|
| Discovered by |
K. Endate K. Watanabe |
| Discovery site | Kitami Obs. |
| Discovery date | 16 May 1990 |
| Designations | |
| MPC designation | (4585) Ainonai |
|
Named after
|
Ainonai, near Kitami (Japanese town) |
| 1990 KQ · 1972 LU 1978 WL12 · 1981 LC |
|
| main-belt · (middle) | |
| Orbital characteristics | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 43.98 yr (16,064 days) |
| Aphelion | 3.3827 AU |
| Perihelion | 2.0884 AU |
| 2.7355 AU | |
| Eccentricity | 0.2366 |
| 4.52 yr (1,653 days) | |
| 319.61° | |
| 0° 13m 4.08s / day | |
| Inclination | 10.548° |
| 82.979° | |
| 184.03° | |
| Physical characteristics | |
| Dimensions |
10.920±0.122 km 15.33 km (calculated) |
| 38.31±0.05 h | |
| 0.057 (assumed) 0.112±0.011 |
|
| C | |
| 12.9 · 12.8 · 13.39±0.50 | |
4585 Ainonai, provisional designation 1990 KQ, is a carbonaceous asteroid from the middle region of the asteroid belt, about 15 kilometers in diameter. It was discovered on 16 May 1990, by Japanese amateur astronomers Kin Endate and Kazuro Watanabe at the Kitami Observatory in eastern Hokkaidō, Japan.
The dark C-type asteroid orbits the Sun at a distance of 2.1–3.4 AU once every 4 years and 6 months (1,653 days). Its orbit has an eccentricity of 0.24 and an inclination of 11° with respect to the ecliptic. The first precovery was obtained at Crimea–Nauchnij in 1972, extending the asteroid's observation arc by 18 years prior to its discovery.
A rotational light-curve was obtained from photometric observation made at the Via Capote Observatory, California, in June 2008. It showed a rotation period of 38.31±0.05 hours with a brightness amplitude of 0.30 in magnitude (U=3-) According to observations from the NEOWISE mission of NASA's space-based Wide-field Infrared Survey Explorer, the asteroid has an albedo of 0.11 with a corresponding diameter of 10.9 kilometers. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 15.3 kilometers, based on an absolute magnitude of 12.8.
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