(6390) Hirabayashi Main-belt Asteroid
Discovered on 26 January 1990 by Endate, K., Watanabe, K. at Kitami.
Where Hirabayashi is today
Seen from above the solar system on 2026-10-14: Hirabayashi is 3.37 au from the Sun and 2.95 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 6390 |
| Provisional designation | 1990 BG1 |
| Orbit class | Main-belt Asteroid |
| Diameter | 14.7 km (#3,212 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0740 |
| Absolute magnitude (H) | 12.99 |
| Orbital period | 4.90 years |
| Semi-major axis | 2.88 au |
| Perihelion – aphelion | 2.38 – 3.39 au |
| Eccentricity | 0.174 |
| Inclination | 6.07° |
| Closest distance between its orbit and Earth's (MOID) | 1.40 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
More named asteroids discovered by Endate, K., Watanabe, K.
- (4042) Okhotsk
- (4126) Mashu
- (4460) Bihoro
- (4491) Otaru
- (4497) Taguchi
- (4508) Takatsuki
- (4547) Massachusetts
- (4585) Ainonai
- (4607) Seilandfarm
- (4641) Ayako
- (4712) Iwaizumi
- (4773) Hayakawa
← (6389) Ogawa · (6391) Africano →