(21128) Chapuis Outer Main-belt Asteroid
Discovered on 27 January 1993 by E. W. Elst at Caussols.
Grégoire Chapuis (1761-1794) was a surgeon dedicated to educating the poor by establishing evening classes. As mayor of the city of Verviers, he promoted civil weddings. He was therefore accused of blasphemy by the prince-archbishop of Liège and put to death by beheading.Naming citation (20041126/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Chapuis is today
Seen from above the solar system on 2026-10-14: Chapuis is 3.54 au from the Sun and 4.37 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21128 |
| Provisional designation | 1993 BJ5 |
| Orbit class | Outer Main-belt Asteroid |
| Diameter | 18.4 km (#2,433 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0740 |
| Absolute magnitude (H) | 12.16 |
| Orbital period | 7.88 years |
| Semi-major axis | 3.96 au |
| Perihelion – aphelion | 3.53 – 4.38 au |
| Eccentricity | 0.107 |
| Inclination | 7.92° |
| Closest distance between its orbit and Earth's (MOID) | 2.54 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Gregoire
All asteroids named after someone called Gregoire
Also discovered on 27 January 1993
- (8386) Vanvinckenroye
- (9614) Cuvier
- (10121) Arzamas
- (10122) Froding
- (10354) Guillaumebude
- (11302) Rubicon
- (11552) Boucolion
- (11553) Scheria
- (12341) Calevoet
- (13096) Tigris
- (17521) Kiek