(5573) Hilarydownes Main-belt Asteroid
Discovered on 24 August 1981 by A. Mrkos at Klet.
Hilary Downes (b. 1954) is a planetary petrologist at Birkbeck College London. She is a terrestrial mantle expert, and her planetary science research seeks to understand the geological evolution of the ureilite meteorite parent body.Naming citation (MPC batch dated 2018-05-29), IAU / Minor Planet Center, via NASA/JPL
Where Hilarydownes is today
Seen from above the solar system on 2026-10-14: Hilarydownes is 2.13 au from the Sun and 3.11 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 5573 |
| Provisional designation | 1981 QX |
| Orbit class | Main-belt Asteroid |
| Diameter | 10.0 km (#5,089 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0970 |
| Rotation period | 10.7 hours |
| Absolute magnitude (H) | 13.95 |
| Orbital period | 4.17 years |
| Semi-major axis | 2.59 au |
| Perihelion – aphelion | 1.83 – 3.35 au |
| Eccentricity | 0.294 |
| Inclination | 11.2° |
| Closest distance between its orbit and Earth's (MOID) | 0.851 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Hilary
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