(5661) Hildebrand Outer Main-belt Asteroid
Discovered on 14 August 1977 by N. S. Chernykh at Nauchnyj.
Where Hildebrand is today
Seen from above the solar system on 2026-10-14: Hildebrand is 4.32 au from the Sun and 4.01 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 5661 |
| Provisional designation | 1977 PO1 |
| Orbit class | Outer Main-belt Asteroid |
| Diameter | 34.4 km (#1,177 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.136 |
| Rotation period | 6.80 hours |
| Absolute magnitude (H) | 11.09 |
| Orbital period | 7.87 years |
| Semi-major axis | 3.96 au |
| Perihelion – aphelion | 3.03 – 4.88 au |
| Eccentricity | 0.234 |
| Inclination | 13.3° |
| Closest distance between its orbit and Earth's (MOID) | 2.02 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 14 August 1977
- (2294) Andronikov
- (2477) Biryukov
- (2497) Kulikovskij
- (2579) Spartacus
- (2670) Chuvashia
- (4982) Bartini
- (10670) Seminozhenko
- (24607) Sevnatu