(21687) Filopanti Main-belt Asteroid
Discovered on 11 September 1999 by Osservatorio San Vittore at Bologna.
Quirico Filopanti was the pseudonym of Italian patriot Giuseppe Barilli (1812-1894), professor of mathematics at Bologna University. He was author of the books L´Universo and Lezioni di Astronomia.Naming citation (20030318/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Filopanti is today
Seen from above the solar system on 2026-10-14: Filopanti is 2.70 au from the Sun and 2.89 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21687 |
| Provisional designation | 1999 RB37 |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.96 km (#12,836 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.372 |
| Absolute magnitude (H) | 14.03 |
| Orbital period | 4.63 years |
| Semi-major axis | 2.78 au |
| Perihelion – aphelion | 2.56 – 2.99 au |
| Eccentricity | 0.0772 |
| Inclination | 5.72° |
| Closest distance between its orbit and Earth's (MOID) | 1.56 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 11 September 1999
- (12583) Buckjean
- (13396) Midavaine
- (16065) Borel
- (20517) Judycrystal
- (20597) Pickersgill
- (20613) Chibaken
- (21685) Francomallia
- (21686) Koschny
- (36061) Haldane
- (36169) Grosseteste
- (38270) Wettzell
- (40440) Dobrovsky