(1200) Imperatrix Main-belt Asteroid
Discovered on 14 September 1931 by K. Reinmuth at Heidelberg.
Where Imperatrix is today
Seen from above the solar system on 2026-10-14: Imperatrix is 2.71 au from the Sun and 3.29 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 1200 |
| Provisional designation | 1931 RH |
| Orbit class | Main-belt Asteroid |
| Diameter | 42.0 km (#920 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0650 |
| Rotation period | 17.8 hours |
| Absolute magnitude (H) | 10.9 |
| Orbital period | 5.35 years |
| Semi-major axis | 3.06 au |
| Perihelion – aphelion | 2.71 – 3.40 au |
| Eccentricity | 0.113 |
| Inclination | 4.61° |
| Closest distance between its orbit and Earth's (MOID) | 1.70 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.