(12104) Chesley Main-belt Asteroid
Discovered on 22 May 1998 by LONEOS at Anderson Mesa.
Steven R. Chesley (b. 1965), of the Solar System Dynamics Group at the Jet Propulsion Laboratory, is an expert in determination of the orbits of minor planets and application to the study of earth-impact probability. He was also a member of the NEAR spacecraft navigation team.Naming citation (20020724/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Chesley is today
Seen from above the solar system on 2026-10-14: Chesley is 3.07 au from the Sun and 2.12 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 12104 |
| Provisional designation | 1998 KO6 |
| Orbit class | Main-belt Asteroid |
| Diameter | 11.1 km (#4,507 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.157 |
| Rotation period | 3.95 hours |
| Absolute magnitude (H) | 12.7 |
| Orbital period | 5.22 years |
| Semi-major axis | 3.01 au |
| Perihelion – aphelion | 2.94 – 3.09 au |
| Eccentricity | 0.0247 |
| Inclination | 11.1° |
| Closest distance between its orbit and Earth's (MOID) | 1.92 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Steven
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- (13415) Stevenbland
- (14438) MacLean
- (15941) Stevegauthier
- (16236) Stebrehmer
All asteroids named after someone called Steven
Also discovered on 22 May 1998
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- (11730) Yanhua
- (11735) Isabellecohen
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- (12107) Reneebarcia
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- (12529) Reighard
- (12530) Richardson
- (12860) Turney
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- (12863) Whitfield