(20003) Andorfer Main-belt Asteroid
Discovered on 11 March 1991 by H. Debehogne at La Silla.
Gregory P. Andorfer (1951–2020) was an American science communicator who was Series Producer for Carl Sagan's Cosmos TV series. Later Executive Director and CEO for the Maryland Science Center, he designed a capital campaign to renew and add new exhibits. Andorfer received an honorary Ph.D.for his science popularization.Naming citation (WGSBN Bull. 3, #17, 5), IAU / Minor Planet Center, via NASA/JPL
Where Andorfer is today
Seen from above the solar system on 2026-10-14: Andorfer is 2.27 au from the Sun and 1.93 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 20003 |
| Provisional designation | 1991 EX2 |
| Orbit class | Main-belt Asteroid |
| Absolute magnitude (H) | 14.75 |
| Orbital period | 3.41 years |
| Semi-major axis | 2.26 au |
| Perihelion – aphelion | 2.25 – 2.28 au |
| Eccentricity | 0.00469 |
| Inclination | 8.04° |
| Closest distance between its orbit and Earth's (MOID) | 1.26 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Gregory
- (12083) Darone
- (12192) Gregbollendonk
- (13857) Stafford
- (18020) Amend
- (18862) Warot
- (21915) Lavins
- (22913) Brockman
- (27291) Greghansen
- (30365) Gregduran
- (53435) Leonard
- (85878) Guzik
- (154378) Hennessy
All asteroids named after someone called Gregory