(13553) Masaakikoyama Amor
Discovered on 2 May 1992 by T. Seki at Geisei.
Masaaki Koyama (b. 1934), Japanese baseball player, was known for his superb ball control and was called “a precision throwing machine”. Since retiring, he has been active as a coach, baseball commentator and critic. He was inducted into Japan's Baseball Hall of Fame in 2001.Naming citation (20120207/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Masaakikoyama is today
Seen from above the solar system on 2026-10-14: Masaakikoyama is 3.19 au from the Sun and 3.64 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 13553 |
| Provisional designation | 1992 JE |
| Orbit class | Amor · near-Earth |
| Rotation period | 58.0 hours |
| Absolute magnitude (H) | 16.54 |
| Orbital period | 3.24 years |
| Semi-major axis | 2.19 au |
| Perihelion – aphelion | 1.18 – 3.21 au |
| Eccentricity | 0.463 |
| Inclination | 5.87° |
| Closest distance between its orbit and Earth's (MOID) | 0.191 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Masaaki
All asteroids named after someone called Masaaki