(9121) Stefanovalentini Outer Main-belt Asteroid
Discovered on 24 February 1998 by V. S. Casulli at Colleverde.
Stefano Valentini (b. 1955) is an Italian amateur astronomer and able computer programmer well known for his software WinAstrometry, used at many Italian amateur observatories for the calculation of astrometric positions from CCD images. Since 1993 he has collaborated with the observatory where this discovery was made.Naming citation (20000726/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Stefanovalentini is today
Seen from above the solar system on 2026-10-14: Stefanovalentini is 3.97 au from the Sun and 3.52 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 9121 |
| Provisional designation | 1998 DJ11 |
| Orbit class | Outer Main-belt Asteroid |
| Rotation period | 11.8 hours |
| Absolute magnitude (H) | 11.36 |
| Orbital period | 7.63 years |
| Semi-major axis | 3.88 au |
| Perihelion – aphelion | 3.72 – 4.03 au |
| Eccentricity | 0.0408 |
| Inclination | 4.65° |
| Closest distance between its orbit and Earth's (MOID) | 2.70 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Stefano
- (8943) Stefanozavka
- (9920) Bagnulo
- (11476) Stefanosimoni
- (19331) Stefanovitale
- (22354) Sposetti
- (35324) Orlandi
- (66250) Giovanardi
- (66939) Franscini
- (73872) Stefanoragazzi
- (78124) Cicalo
- (97069) Stek
- (113623) Stefanovoglino
All asteroids named after someone called Stefano