(1866) Sisyphus
|
Asteroid (1866) Sisyphus |
|
|---|---|
| Properties of the orbit ( animation ) | |
| Orbit type | Apollo type |
| Major semi-axis | 1.8934 AU |
| eccentricity | 0.5386 |
| Perihelion - aphelion | 0.8737 AU - 2.9131 AU |
| Inclination of the orbit plane | 41.202 ° |
| Length of the ascending node | 63.498 ° |
| Argument of the periapsis | 293.094 ° |
| Sidereal period | 2.61 a |
| Mean orbital velocity | 21.64 km / s |
| Physical Properties | |
| Medium diameter | 8.48 km |
| Albedo | 0.15 |
| Rotation period | 2.4 h |
| Absolute brightness | 12.4 mag |
| Spectral class | S type |
| history | |
| Explorer | Paul Wild |
| Date of discovery | 5th December 1972 |
| Another name | 1972 XA |
| 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. | |
(1866) Sisyphus is a near-Earth asteroid (planetoid) of the Apollo type .
The asteroid was discovered on December 5, 1972 by Paul Wild at the Swiss Zimmerwald observatory and is named after Sisyphus , a well-known figure in Greek mythology .
On November 25, 1972, the asteroid was photographed by Diethart Ruhnow and the then 15-year-old Stephan Petermann at the Rodewisch school observatory in what was then the GDR . This pre-discovery photograph was only seen after the discovery.
Sisyphus moves between 0.8737 AU ( perihelion ) and 2.9131 AU ( aphelion ) around the sun in around 2.6 years . The orbital eccentricity is 0.5386, the orbit is unusually steeply inclined towards the ecliptic at 41.2 ° .
Sisyphus is an S-type asteroid with an albedo of about 0.15. It rotates on its own axis in just 2.4 hours and consequently has an exceptionally fast rotation. With a diameter of just under 8.5 km, Sisyphus is the largest known Apollo asteroid.
exploration
A small natural satellite 0.8 km in diameter accompanying Sisyphus was discovered on radar images from the Arecibo Observatory in 1985 .
See also
Individual evidence
- ↑ Asteroid Sisyphus - LUA ASTROLOGY. Retrieved June 27, 2017 .
- ^ Curtis Peebles: Asteroid: A History. 2000, accessed July 15, 2017 .
- ↑ (1866) Sisyphus. Retrieved June 28, 2017 .