(22489) Yanaka Main-belt Asteroid
Discovered on 7 April 1997 by A. Nakamura at Kuma Kogen.
Tetsuo Yanaka (b. 1954) is a post office clerk and amateur astronomer in Japan. He started his visual search for comets in 1970, and after sweeping for 1068 hours, he independently discovered C/1988 P1. Five months later, he discovered two more comets, C/1988 Y1 and C/1989 A1, only three days apart.Naming citation (20020724/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Yanaka is today
Seen from above the solar system on 2026-10-14: Yanaka is 3.20 au from the Sun and 3.69 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 22489 |
| Provisional designation | 1997 GR24 |
| Orbit class | Main-belt Asteroid |
| Diameter | 5.68 km (#9,441 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.165 |
| Absolute magnitude (H) | 13.77 |
| Orbital period | 4.42 years |
| Semi-major axis | 2.69 au |
| Perihelion – aphelion | 2.18 – 3.21 au |
| Eccentricity | 0.191 |
| Inclination | 12.2° |
| Closest distance between its orbit and Earth's (MOID) | 1.19 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Tetsuo
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