Global Information4585 Ainonai information
| Discovery [1] | |
|---|---|
| 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)[2] |
Alternative designations | 1990 KQ · 1972 LU 1978 WL12 · 1981 LC |
Minor planet category |
|
| Orbital characteristics [3] | |
| Epoch 31 May 2020 (JD 2459000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 47.87 yr (17,486 d) |
| Aphelion | 3.3818 AU |
| Perihelion | 2.0894 AU |
Semi-major axis | 2.7356 AU |
| Eccentricity | 0.2362 |
Orbital period (sidereal) | 4.52 yr (1,653 d) |
Mean anomaly | 220.84° |
Mean motion | 0° 13m 4.08s / day |
| Inclination | 10.549° |
Longitude of ascending node | 82.966° |
Argument of perihelion | 184.23° |
| Physical characteristics | |
Mean diameter | 10.920±0.122 km[7] |
Synodic rotation period | 38.31±0.05 h[8] |
Geometric albedo | 0.112±0.011[7] |
Spectral type | C (family-based)[9][10] |
Absolute magnitude (H) |
|
4585 Ainonai (prov. designation: 1990 KQ) is a dark Chloris asteroid, approximately 11 kilometers (6.8 miles) in diameter, located in the central region of the asteroid belt. It was discovered on 16 May 1990, by Japanese amateur astronomers Kin Endate and Kazuro Watanabe at the Kitami Observatory in eastern Hokkaidō, Japan.[1] The presumed carbonaceous C-type asteroid has a longer than average rotation period of 38.3 hours. It was named for the Japanese town of Ainonai, located near the discovering observatory.[2]
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