(6135) Billowen Main-belt Asteroid
Discovered on 14 September 1990 by H. E. Holt at Palomar.
Where Billowen is today
Seen from above the solar system on 2026-10-14: Billowen is 2.24 au from the Sun and 2.91 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 6135 |
| Provisional designation | 1990 RD9 |
| Orbit class | Main-belt Asteroid |
| Diameter | 11.0 km (#4,586 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.111 |
| Rotation period | 28.5 hours |
| Absolute magnitude (H) | 13.09 |
| Orbital period | 3.79 years |
| Semi-major axis | 2.43 au |
| Perihelion – aphelion | 2.12 – 2.74 au |
| Eccentricity | 0.127 |
| Inclination | 11.3° |
| Closest distance between its orbit and Earth's (MOID) | 1.16 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 14 September 1990
- (5439) Couturier
- (6133) Royaldutchastro
- (6312) Robheinlein
- (6313) Tsurutani
- (6716) Jacobsen
- (10521) Jeremyhansen