(9920) Bagnulo Main-belt Asteroid
Discovered on 1 March 1981 by S. J. Bus at Siding Spring.
Stefano Bagnulo (b. 1965) is an astronomer at the Armagh Observatory and a specialist in polarimetry of early-type stars. He has extended his expertise to polarization measurements of solar system bodies, including transneptunian objects, Centaurs and cometary nuclei.Naming citation (MPC batch dated 2014-07-12), IAU / Minor Planet Center, via NASA/JPL
Where Bagnulo is today
Seen from above the solar system on 2026-10-14: Bagnulo is 2.90 au from the Sun and 3.12 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 9920 |
| Provisional designation | 1981 EZ10 |
| Orbit class | Main-belt Asteroid |
| Diameter | 12.9 km (#3,735 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0340 |
| Absolute magnitude (H) | 13.59 |
| Orbital period | 4.65 years |
| Semi-major axis | 2.78 au |
| Perihelion – aphelion | 2.67 – 2.90 au |
| Eccentricity | 0.0402 |
| Inclination | 3.26° |
| Closest distance between its orbit and Earth's (MOID) | 1.66 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Stefano
- (8943) Stefanozavka
- (9121) Stefanovalentini
- (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
Also discovered on 1 March 1981
- (2788) Andenne
- (3016) Meuse
- (3029) Sanders
- (3030) Vehrenberg
- (3042) Zelinsky
- (3058) Delmary
- (3075) Bornmann
- (3135) Lauer
- (3308) Ferreri
- (3472) Upgren
- (3498) Belton
- (3503) Brandt
More named asteroids discovered by S. J. Bus
- (2285) Ron Helin
- (2780) Monnig
- (2791) Paradise
- (2884) Reddish
- (2919) Dali
- (2980) Cameron
- (2981) Chagall
- (2990) Trimberger
- (3000) Leonardo
- (3029) Sanders
- (3030) Vehrenberg
- (3042) Zelinsky
← (9919) Undset · (9921) Rubincam →