(989) Schwassmannia Main-belt Asteroid
Discovered on 18 November 1922 by A. Schwassmann at Bergedorf.
Where Schwassmannia is today
Seen from above the solar system on 2026-10-14: Schwassmannia is 2.05 au from the Sun and 1.08 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 989 |
| Provisional designation | A922 WD |
| Orbit class | Main-belt Asteroid |
| Diameter | 12.6 km (#3,856 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.306 |
| Rotation period | 108 hours |
| Absolute magnitude (H) | 11.81 |
| Orbital period | 4.34 years |
| Semi-major axis | 2.66 au |
| Perihelion – aphelion | 2.00 – 3.32 au |
| Eccentricity | 0.249 |
| Inclination | 14.7° |
| Closest distance between its orbit and Earth's (MOID) | 1.01 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
More named asteroids discovered by A. Schwassmann
- (454) Mathesis
- (905) Universitas
- (906) Repsolda
- (912) Maritima
- (947) Monterosa
- (1192) Prisma
- (1303) Luthera
- (1310) Villigera
← (988) Appella · (990) Yerkes →