(3944) Halliday Main-belt Asteroid
Discovered on 24 November 1981 by E. Bowell at Anderson Mesa.
Where Halliday is today
Seen from above the solar system on 2026-10-14: Halliday is 2.73 au from the Sun and 3.65 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 3944 |
| Provisional designation | 1981 WP1 |
| Orbit class | Main-belt Asteroid |
| Diameter | 5.87 km (#9,119 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.295 |
| Rotation period | 5.57 hours |
| Absolute magnitude (H) | 13.39 |
| Orbital period | 3.65 years |
| Semi-major axis | 2.37 au |
| Perihelion – aphelion | 2.01 – 2.73 au |
| Eccentricity | 0.151 |
| Inclination | 7.54° |
| Closest distance between its orbit and Earth's (MOID) | 1.02 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
- (4024) Ronan
- (4025) Ridley
- (5500) Twilley
- (6628) Dondelia
- (7738) Heyman