(10500) Nishi-koen Main-belt Asteroid
Discovered on 3 April 1987 by M. Koishikawa at Ayashi.
Nishi-koen park is the location of the Sendai Astronomical Observatory, which is celebrating its fiftieth anniversary on 2005 Feb. 1. The observatory will be moved to near the Ayashi Station in 2008.Naming citation (20050125/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Nishi-koen is today
Seen from above the solar system on 2026-10-14: Nishi-koen is 2.27 au from the Sun and 3.18 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 10500 |
| Provisional designation | 1987 GA |
| Orbit class | Main-belt Asteroid |
| Diameter | 7.54 km (#7,077 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.215 |
| Rotation period | 44.6 hours |
| Absolute magnitude (H) | 12.98 |
| Orbital period | 4.40 years |
| Semi-major axis | 2.68 au |
| Perihelion – aphelion | 2.16 – 3.21 au |
| Eccentricity | 0.195 |
| Inclination | 11.1° |
| Closest distance between its orbit and Earth's (MOID) | 1.15 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Sendai
All asteroids named after someone called Sendai