(21362) Dickarmstrong Main-belt Asteroid
Discovered on 30 April 1997 by Spacewatch at Kitt Peak.
Richard Armstrong (1937-1991) studied radiogenic isotope geochemistry, geology of the American Cordillera, geochronology, and Earth's geochemical evolution. Name suggested by R. and P. Jedicke.Naming citation (MPC batch dated 2016-06-20), IAU / Minor Planet Center, via NASA/JPL
Where Dickarmstrong is today
Seen from above the solar system on 2026-10-14: Dickarmstrong is 2.82 au from the Sun and 3.79 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21362 |
| Provisional designation | 1997 HS3 |
| Orbit class | Main-belt Asteroid |
| Diameter | 4.14 km (#12,399 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0710 |
| Absolute magnitude (H) | 15.55 |
| Orbital period | 4.94 years |
| Semi-major axis | 2.90 au |
| Perihelion – aphelion | 2.63 – 3.17 au |
| Eccentricity | 0.0936 |
| Inclination | 3.37° |
| Closest distance between its orbit and Earth's (MOID) | 1.64 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Richard
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- (4252) Godwin
- (5391) Emmons
- (5567) Durisen
- (6368) Richardmenendez
- (6893) Sanderson
- (7392) Kowalski
- (7845) Mckim
- (7966) Richardbaum
- (8331) Dawkins
- (8717) Richviktorov
- (9725) Wainscoat
All asteroids named after someone called Richard