(21887) Dipippo Main-belt Asteroid
Discovered on 20 October 1999 by LONEOS at Anderson Mesa.
Simonetta Di Pippo (b. 1959) works on solar-system exploration at the Italian Space Agency. She has coordinated the Italian contribution to missions such as Cassini-Huygens, Rosetta, Mars Express, Mars Reconnaissance Orbiter, Venus Express, Dawn and BepiColombo.Naming citation (20080718/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Dipippo is today
Seen from above the solar system on 2026-10-14: Dipippo is 2.77 au from the Sun and 3.53 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21887 |
| Provisional designation | 1999 UH42 |
| Orbit class | Main-belt Asteroid |
| Diameter | 7.64 km (#6,950 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.145 |
| Absolute magnitude (H) | 13.71 |
| Orbital period | 5.14 years |
| Semi-major axis | 2.98 au |
| Perihelion – aphelion | 2.76 – 3.20 au |
| Eccentricity | 0.0731 |
| Inclination | 9.69° |
| Closest distance between its orbit and Earth's (MOID) | 1.79 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.