(1100) Arnica Main-belt Asteroid
Discovered on 22 September 1928 by K. Reinmuth at Heidelberg.
Where Arnica is today
Seen from above the solar system on 2026-10-14: Arnica is 2.70 au from the Sun and 2.38 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 1100 |
| Provisional designation | 1928 SD |
| Orbit class | Main-belt Asteroid |
| Diameter | 16.9 km (#2,700 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.246 |
| Rotation period | 14.5 hours |
| Absolute magnitude (H) | 10.9 |
| Orbital period | 4.93 years |
| Semi-major axis | 2.90 au |
| Perihelion – aphelion | 2.70 – 3.10 au |
| Eccentricity | 0.0701 |
| Inclination | 1.03° |
| Closest distance between its orbit and Earth's (MOID) | 1.68 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.