140 Siwa
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| Orbital characteristics 1 | |
|---|---|
| Orbit type | Main belt |
| Semimajor axis | 2.732 AU |
| Perihelion distance | 2.143 AU |
| Aphelion distance | 3.322 AU |
| Orbital period | 4.52 years |
| Inclination | 3.19° |
| Eccentricity | 0.216 |
| Physical characteristics | |
| Diameter 6 | 103 km |
| Mass 6 | 1.5 × 1018 kg |
| Rotation period | 18.5 hours |
| Spectral class 5 | P (C 6) |
| Abs. magnitude 1 | 8.34 |
| Albedo 4 | 0.067 |
| History 2 | |
| Discoverer | J. Palisa, 1874 |
140 Siwa is a large and dark main belt asteroid. It has a composition of a P (or possibly C-type) asteroid.
It was discovered by J. Palisa on October 13, 1874 and named after Siwa, the Slavic goddess of fertility.
Siwa has a very flat lightcurve, indicating a spherical body.
The Rosetta comet probe was to visit Siwa on its way to comet 46P/Wirtanen in July, 2008. However, the mission was rerouted to comet 67P/Churyumov-Gerasimenko and the flyby had to be abandoned.
| Minor planets | ||
|---|---|---|
| Previous minor planet | 140 Siwa | Next minor planet |
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| Vulcanoids | Near-Earth asteroids | Main belt | Jupiter Trojans | Centaurs | Damocloids | Comets | Trans-Neptunians (Kuiper belt · Scattered disc · Oort cloud) |
| For other objects and regions, see: asteroid groups and families, binary asteroids, asteroid moons and the Solar system For a complete listing, see: List of asteroids. See also Pronunciation of asteroid names and Meanings of asteroid names. |
