(8939) Onodajunjiro Main-belt Asteroid
Discovered on 29 January 1997 by T. Kobayashi at Oizumi.
Junjiro Onoda (b. 1946) is director of the Mu-series satellite launcher program of the Institute of Space and Astronautical Science. He also led the mechanical and structural development of many Japanese scientific satellites.Naming citation (20031110/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Onodajunjiro is today
Seen from above the solar system on 2026-10-14: Onodajunjiro is 2.69 au from the Sun and 2.88 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 8939 |
| Provisional designation | 1997 BU1 |
| Orbit class | Main-belt Asteroid |
| Diameter | 6.28 km (#8,528 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.214 |
| Absolute magnitude (H) | 13.65 |
| Orbital period | 4.99 years |
| Semi-major axis | 2.92 au |
| Perihelion – aphelion | 2.69 – 3.15 au |
| Eccentricity | 0.0788 |
| Inclination | 1.76° |
| Closest distance between its orbit and Earth's (MOID) | 1.71 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.