(4644) Oumu Main-belt Asteroid
Discovered on 16 September 1990 by Takahashi, A., Watanabe, K. at Kitami.
Where Oumu is today
Seen from above the solar system on 2026-10-14: Oumu is 2.54 au from the Sun and 3.42 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 4644 |
| Provisional designation | 1990 SR3 |
| Orbit class | Main-belt Asteroid |
| Diameter | 7.49 km (#7,115 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.300 |
| Rotation period | 84.2 hours |
| Absolute magnitude (H) | 12.48 |
| Orbital period | 4.22 years |
| Semi-major axis | 2.61 au |
| Perihelion – aphelion | 2.24 – 2.98 au |
| Eccentricity | 0.142 |
| Inclination | 14.1° |
| Closest distance between its orbit and Earth's (MOID) | 1.24 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 16 September 1990
- (4645) Tentaikojo
- (4676) Uedaseiji
- (4975) Dohmoto
- (5235) Jean-Loup
- (5965) Meisel
- (7058) Al-Tusi
- (7060) Al-`Ijliya
- (10086) McCurdy
- (21044) Rummel
- (24695) Styrsky