(1646) Rosseland Main-belt Asteroid
Discovered on 19 January 1939 by Y. Vaisala at Turku.
Where Rosseland is today
Seen from above the solar system on 2026-10-14: Rosseland is 2.60 au from the Sun and 3.58 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 1646 |
| Provisional designation | 1939 BG |
| Orbit class | Main-belt Asteroid |
| Diameter | 12.8 km (#3,786 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.202 |
| Rotation period | 69.2 hours |
| Absolute magnitude (H) | 12.1 |
| Orbital period | 3.63 years |
| Semi-major axis | 2.36 au |
| Perihelion – aphelion | 2.08 – 2.64 au |
| Eccentricity | 0.119 |
| Inclination | 8.38° |
| Closest distance between its orbit and Earth's (MOID) | 1.11 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.