(140) Siwa
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Asteroid (140) Siwa |
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| Properties of the orbit ( animation ) | |
| Orbit type | Main belt asteroid |
| Major semi-axis | 2.731 AU |
| eccentricity | 0.217 |
| Perihelion - aphelion | 2.138 AU - 3.324 AU |
| Inclination of the orbit plane | 3.2 ° |
| Length of the ascending node | 107.3 ° |
| Argument of the periapsis | 197 ° |
| Time of passage of the perihelion | July 21, 2009 |
| Sidereal period | 4 a 188 d |
| Mean orbital velocity | 17.8 km / s |
| Physical Properties | |
| Medium diameter | 110 km |
| Albedo | 0.07 |
| Absolute brightness | 8.3 mag |
| Spectral class | P |
| history | |
| Explorer | Johann Palisa |
| Date of discovery | October 13, 1874 |
| Another name | 1948 AL |
| Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items. | |
(140) Siwa is an asteroid of the main asteroid belt discovered by Johann Palisa on October 13, 1874 . The name is derived from the Slavic goddess Siwa .
Siwa moves between 2.1 ( perihelion ) astronomical units to 3.3 astronomical units ( aphelion ) around the sun in 4.5 years . The orbit is inclined 3.2 ° to the ecliptic , the orbital eccentricity is 0.22.
Siwa has a diameter of 110 km. It has a dark carbon-rich surface with an albedo of 0.07. The exact period of rotation of the asteroid is not yet known.