(8927) Ryojiro Main-belt Asteroid
Discovered on 20 December 1996 by T. Kobayashi at Oizumi.
Ryojiro Akiba (b. 1930), professor of astronautics and former director-general of the Institute of Space and Astronautical Science, is a pioneer in the Japanese space program. His achievements include the first Japanese satellite, Ohsumi, and the interplanetary probes Suisei and Sakigake that went to Comet 1P/Halley.Naming citation (20031110/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Ryojiro is today
Seen from above the solar system on 2026-10-14: Ryojiro is 2.82 au from the Sun and 2.86 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 8927 |
| Provisional designation | 1996 YT |
| Orbit class | Main-belt Asteroid |
| Diameter | 9.10 km (#5,685 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0260 |
| Rotation period | 7.99 hours |
| Absolute magnitude (H) | 14.37 |
| Orbital period | 3.73 years |
| Semi-major axis | 2.41 au |
| Perihelion – aphelion | 1.99 – 2.82 au |
| Eccentricity | 0.173 |
| Inclination | 3.48° |
| Closest distance between its orbit and Earth's (MOID) | 0.977 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.