(9554) Dumont Inner Main-belt Asteroid
Discovered on 13 December 1985 by R. Chemin at Caussols.
Meudon mathematician and astronomer Simone Dumont (b. 1924) has studied T Tauri stars, active galaxies, radiative transfer and the history of astronomy. Modest and tactful, she was editor of L´Astronomie for several years. The citation was prepared by R. Chemin and C. Pollas.Naming citation (20000523/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Dumont is today
Seen from above the solar system on 2026-10-14: Dumont is 1.99 au from the Sun and 2.48 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 9554 |
| Provisional designation | 1985 XA |
| Orbit class | Inner Main-belt Asteroid |
| Diameter | 2.90 km (#15,449 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.365 |
| Rotation period | 28.7 hours |
| Absolute magnitude (H) | 14.76 |
| Orbital period | 2.63 years |
| Semi-major axis | 1.90 au |
| Perihelion – aphelion | 1.81 – 2.00 au |
| Eccentricity | 0.0504 |
| Inclination | 24.9° |
| Closest distance between its orbit and Earth's (MOID) | 0.840 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Simone
- (6950) Simonek
- (11385) Beauvoir
- (28817) Simoneflood
- (31957) Braunstein
- (32516) Simoneieva
- (34652) Simoneevans
- (37836) Simoneterreni
- (65357) Antoniucci
- (72543) Simonemarchi
- (317000) Simonepastore
All asteroids named after someone called Simone