(4491) Otaru Main-belt Asteroid
Discovered on 7 September 1988 by Endate, K., Watanabe, K. at Kitami.
Where Otaru is today
Seen from above the solar system on 2026-10-14: Otaru is 2.16 au from the Sun and 2.06 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 4491 |
| Provisional designation | 1988 RP |
| Orbit class | Main-belt Asteroid |
| Diameter | 5.11 km (#10,409 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.389 |
| Rotation period | 2.94 hours |
| Spectral type | Sa |
| Absolute magnitude (H) | 13.71 |
| Orbital period | 3.20 years |
| Semi-major axis | 2.17 au |
| Perihelion – aphelion | 2.11 – 2.24 au |
| Eccentricity | 0.0291 |
| Inclination | 3.67° |
| Closest distance between its orbit and Earth's (MOID) | 1.11 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 7 September 1988
More named asteroids discovered by Endate, K., Watanabe, K.
- (4042) Okhotsk
- (4126) Mashu
- (4460) Bihoro
- (4497) Taguchi
- (4508) Takatsuki
- (4547) Massachusetts
- (4585) Ainonai
- (4607) Seilandfarm
- (4641) Ayako
- (4712) Iwaizumi
- (4773) Hayakawa
- (4839) Daisetsuzan
← (4490) Bambery · (4492) Debussy →