(1999) Hirayama Main-belt Asteroid
Discovered on 27 February 1973 by L. Kohoutek at Bergedorf.
Where Hirayama is today
Seen from above the solar system on 2026-10-14: Hirayama is 3.11 au from the Sun and 2.29 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 1999 |
| Provisional designation | 1973 DR |
| Orbit class | Main-belt Asteroid |
| Diameter | 38.3 km (#1,023 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0530 |
| Rotation period | 15.6 hours |
| Absolute magnitude (H) | 11.1 |
| Orbital period | 5.49 years |
| Semi-major axis | 3.11 au |
| Perihelion – aphelion | 2.74 – 3.48 au |
| Eccentricity | 0.119 |
| Inclination | 12.5° |
| Closest distance between its orbit and Earth's (MOID) | 1.75 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 27 February 1973
More named asteroids discovered by L. Kohoutek
- (1834) Palach
- (1840) Hus
- (1841) Masaryk
- (1842) Hynek
- (1843) Jarmila
- (1861) Komensky
- (1865) Cerberus
- (1875) Neruda
- (1894) Haffner
- (1895) Larink
- (1896) Beer
- (1897) Hind
← (1998) Titius · (2000) Herschel →