(4085) Weir Main-belt Asteroid
Discovered on 13 May 1985 by C. S. Shoemaker at Palomar.
Where Weir is today
Seen from above the solar system on 2026-10-14: Weir is 2.40 au from the Sun and 3.19 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 4085 |
| Provisional designation | 1985 JR |
| Orbit class | Main-belt Asteroid |
| Diameter | 9.22 km (#5,605 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.273 |
| Rotation period | 14.6 hours |
| Absolute magnitude (H) | 12.49 |
| Orbital period | 4.21 years |
| Semi-major axis | 2.61 au |
| Perihelion – aphelion | 2.33 – 2.88 au |
| Eccentricity | 0.106 |
| Inclination | 14.2° |
| Closest distance between its orbit and Earth's (MOID) | 1.35 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.