(22021) Andreariley Outer Main-belt Asteroid
Discovered on 4 December 1999 by CSS at Catalina.
Andrea Riley (b. 1979) has served as the Program Executive for several NASA planetary defense missions, including the agency’s NEOWISE, DART and NEO Surveyor. Prior to working with planetary defense, Riley worked on several of NASA’s human spaceflight programs, including Space Shuttle, Commercial Crew, and International Space Station.Naming citation (WGSBN Bull. 5, #1, 17), IAU / Minor Planet Center, via NASA/JPL
Where Andreariley is today
Seen from above the solar system on 2026-10-14: Andreariley is 3.28 au from the Sun and 3.06 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 22021 |
| Provisional designation | 1999 XQ108 |
| Orbit class | Outer Main-belt Asteroid |
| Diameter | 9.04 km (#5,725 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0780 |
| Absolute magnitude (H) | 13.9 |
| Orbital period | 5.73 years |
| Semi-major axis | 3.20 au |
| Perihelion – aphelion | 2.84 – 3.57 au |
| Eccentricity | 0.114 |
| Inclination | 2.04° |
| Closest distance between its orbit and Earth's (MOID) | 1.84 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Andrea
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- (29657) Andreali
All asteroids named after someone called Andrea
Also discovered on 4 December 1999
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