(20380) Gregoirehenry Main-belt Asteroid
Discovered on 22 May 1998 by LINEAR at Socorro.
Grégoire Henry (b. 1997) is a French astrophysicist at the Royal Observatory of Belgium. His Ph.D. work focuses on the thermophysical modeling of binary asteroids in support of planetary defense missions such as DART, Hera and RAMSES, and on the operations and data processing of thermal imagers.Naming citation (WGSBN Bull. 6, #11, 15), IAU / Minor Planet Center, via NASA/JPL
Where Gregoirehenry is today
Seen from above the solar system on 2026-10-14: Gregoirehenry is 2.25 au from the Sun and 2.47 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 20380 |
| Provisional designation | 1998 KW47 |
| Orbit class | Main-belt Asteroid |
| Diameter | 5.67 km (#9,463 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.240 |
| Rotation period | 3.70 hours |
| Absolute magnitude (H) | 13.45 |
| Orbital period | 4.01 years |
| Semi-major axis | 2.52 au |
| Perihelion – aphelion | 2.16 – 2.88 au |
| Eccentricity | 0.142 |
| Inclination | 2.76° |
| Closest distance between its orbit and Earth's (MOID) | 1.15 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 22 May 1998
- (9466) Shishir
- (11187) Richoliver
- (11730) Yanhua
- (11735) Isabellecohen
- (12104) Chesley
- (12106) Menghuan
- (12107) Reneebarcia
- (12108) Jamesaustin
- (12529) Reighard
- (12530) Richardson
- (12860) Turney
- (12861) Wacker