(140) Siwa Main-belt Asteroid
Discovered on 13 October 1874 by J. Palisa at Pola.
Where Siwa is today
Seen from above the solar system on 2026-10-14: Siwa is 2.62 au from the Sun and 3.60 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 140 |
| Provisional designation | A874 TB |
| Orbit class | Main-belt Asteroid |
| Diameter | 110 km (#198 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0676 |
| Rotation period | 34.4 hours |
| Spectral type | P |
| Absolute magnitude (H) | 8.45 |
| Orbital period | 4.51 years |
| Semi-major axis | 2.73 au |
| Perihelion – aphelion | 2.13 – 3.33 au |
| Eccentricity | 0.218 |
| Inclination | 3.19° |
| Closest distance between its orbit and Earth's (MOID) | 1.12 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
More named asteroids discovered by J. Palisa
- (136) Austria
- (137) Meliboea
- (142) Polana
- (143) Adria
- (151) Abundantia
- (153) Hilda
- (155) Scylla
- (156) Xanthippe
- (178) Belisana
- (182) Elsa
- (183) Istria
- (184) Dejopeja
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