(9123) Yoshiko Main-belt Asteroid
Discovered on 24 March 1998 by T. Kagawa at Gekko.
Yoshiko Nakano (b. 1933), a director of the Gekko Observatory, received the Medal with a Blue Ribbon in 1997 from the Japanese Government for her contribution to astronomical activities and education.Naming citation (20070926/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Yoshiko is today
Seen from above the solar system on 2026-10-14: Yoshiko is 2.39 au from the Sun and 2.51 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 9123 |
| Provisional designation | 1998 FQ11 |
| Orbit class | Main-belt Asteroid |
| Diameter | 10.7 km (#4,745 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0350 |
| Rotation period | 3.36 hours |
| Absolute magnitude (H) | 13.76 |
| Orbital period | 4.17 years |
| Semi-major axis | 2.59 au |
| Perihelion – aphelion | 2.05 – 3.13 au |
| Eccentricity | 0.208 |
| Inclination | 11.9° |
| Closest distance between its orbit and Earth's (MOID) | 1.06 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.