(20626) Rider-Stokes Main-belt Asteroid
Discovered on 4 October 1999 by LINEAR at Socorro.
Ben Gabriel Rider-Stokes (b. 1997) is an English post-doctoral researcher at The Open University specializing in understanding the timing of magmatic differentiation and volatile accretion of achondrites. He evaluates the spectral characteristics of meteorites in the ultraviolet, visible, and near-infrared to identify meteoritic analogs for asteroids.Naming citation (WGSBN Bull. 6, #11, 31), IAU / Minor Planet Center, via NASA/JPL
Where Rider-Stokes is today
Seen from above the solar system on 2026-10-14: Rider-Stokes is 2.38 au from the Sun and 1.46 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 20626 |
| Provisional designation | 1999 TH21 |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.34 km (#14,364 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.309 |
| Absolute magnitude (H) | 14.43 |
| Orbital period | 3.35 years |
| Semi-major axis | 2.24 au |
| Perihelion – aphelion | 1.73 – 2.75 au |
| Eccentricity | 0.229 |
| Inclination | 5.97° |
| Closest distance between its orbit and Earth's (MOID) | 0.723 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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Also discovered on 4 October 1999
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← (20625) Noto · (20629) Robert →