(5500) Twilley Main-belt Asteroid
Discovered on 24 November 1981 by E. Bowell at Anderson Mesa.
Where Twilley is today
Seen from above the solar system on 2026-10-14: Twilley is 2.09 au from the Sun and 1.63 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 5500 |
| Provisional designation | 1981 WR |
| Orbit class | Main-belt Asteroid |
| Diameter | 4.48 km (#11,663 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.350 |
| Rotation period | 2.96 hours |
| Absolute magnitude (H) | 13.75 |
| Orbital period | 3.44 years |
| Semi-major axis | 2.28 au |
| Perihelion – aphelion | 2.08 – 2.48 au |
| Eccentricity | 0.0884 |
| Inclination | 4.40° |
| Closest distance between its orbit and Earth's (MOID) | 1.10 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 24 November 1981
- (2633) Bishop
- (2708) Burns
- (2813) Zappala
- (3172) Hirst
- (3173) McNaught
- (3454) Lieske
- (3853) Haas
- (3944) Halliday
- (4024) Ronan
- (4025) Ridley
- (6628) Dondelia
- (7738) Heyman