(65635) Hirayamashin Main-belt Asteroid
Discovered on 12 March 1977 by Kosai, H., Hurukawa, K. at Kiso.
Shin Hirayama (1867–1945) was a Japanese astrophysicist, and became the second director of Tokyo Astronomical Observatory in 1920. Because he found two new asteroids in 1900, later identified as prediscovery observations of (498) and (727), he is regarded as the Japanese pioneer in asteroid astronomy.Naming citation (WGSBN Bull. 5, #20, 6), IAU / Minor Planet Center, via NASA/JPL
Where Hirayamashin is today
Seen from above the solar system on 2026-10-14: Hirayamashin is 2.43 au from the Sun and 3.42 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 65635 |
| Provisional designation | 1977 EA8 |
| Orbit class | Main-belt Asteroid |
| Diameter | 2.95 km (#15,344 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.294 |
| Rotation period | 221 hours |
| Absolute magnitude (H) | 14.87 |
| Orbital period | 4.12 years |
| Semi-major axis | 2.57 au |
| Perihelion – aphelion | 2.43 – 2.70 au |
| Eccentricity | 0.0525 |
| Inclination | 15.1° |
| Closest distance between its orbit and Earth's (MOID) | 1.44 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Shin
All asteroids named after someone called Shin
Also discovered on 12 March 1977
- (3319) Kibi
- (4272) Entsuji
- (5454) Kojiki
- (6218) Mizushima
- (10009) Hirosetanso
- (12186) Mitukurigen
- (14315) Ogawamachi
- (14316) Higashichichibu
- (14795) Syoyou
- (15202) Yamada-Houkoku
- (15671) Suzannedebarbat
- (15672) Sato-Norio