140 Siwa
|
|
| Orbital characteristics 1 (ftp://ftp.lowell.edu/pub/elgb/astorb.html) | |
|---|---|
| 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 (http://nssdc.gsfc.nasa.gov/planetary/factsheet/asteroidfact.html) | 103 km |
| Mass 6 (http://nssdc.gsfc.nasa.gov/planetary/factsheet/asteroidfact.html) | 1.5 × 1018 kg |
| Rotation period | 18.5 hours |
| Spectral class 5 (http://spiff.rit.edu/richmond/parallax/phot/LCSUMPUB.TXT) | P (C 6 (http://nssdc.gsfc.nasa.gov/planetary/factsheet/asteroidfact.html)) |
| Abs. magnitude 1 (ftp://ftp.lowell.edu/pub/elgb/astorb.html) | 8.34 |
| Albedo 4 (http://dorothy.as.arizona.edu/DSN/IRAS/index_iras.html) | 0.067 |
| History 2 (http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html) | |
| 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.
... | Previous asteroid | 140 Siwa | Next asteroid | ...
| The minor planets |
| Vulcanoids | Main belt | Groups and families | Near-Earth objects | Jupiter Trojans |
| Centaurs | Trans-Neptunians | Damocloids | Comets | Kuiper belt | Oort cloud |
| (For other objects and regions, see: Binary asteroids, Asteroid moons and the Solar system) |
| (For a complete listing, see: List of asteroids. For pronunciation, see: Pronunciation of asteroid names.) |