(142) Polana
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Asteroid (142) Polona |
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|---|---|
| Properties of the orbit ( animation ) | |
| Orbit type | Main belt |
| family | Polana / McCuskey / New Polana / Nysa / W-24 |
| Major semi-axis | 2.42 AU |
| eccentricity | 0.13 |
| Perihelion - aphelion | 2.09 AU - 2.74 AU |
| Inclination of the orbit plane | 2.24 ° |
| Length of the ascending node | 291.3 ° |
| Argument of the periapsis | 292.0 ° |
| Time of passage of the perihelion | February 8, 2015 |
| Sidereal period | 3.76 a |
| Mean orbital velocity | 19.1 km / s |
| Physical Properties | |
| Medium diameter | approx. 55 km |
| Albedo | 0.045 |
| Rotation period | 9 h 46 min |
| Absolute brightness | 10.3 mag |
| Spectral class |
Tholen: F SMASSII: Cb |
| history | |
| Explorer | Johann Palisa |
| Date of discovery | January 28, 1875 |
| Another name | 1954 BH, 1956 XZ, 1963 SA, A923 WA |
| 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. | |
(142) Polana is an asteroid of the main asteroid belt discovered by Johann Palisa on January 28, 1875 . Palisa discovered the asteroid at the naval observatory in Pula ( it. Pola ) and named it after this place.
Polana ranges from 2.09 ( perihelion ) astronomical units to 2.74 astronomical units ( aphelion ) in 3.76 years around the sun . The orbit is inclined 2.24 ° to the ecliptic , the orbital eccentricity is 0.13. (142) Polana is one of the relatively rare representatives of the F-type and is part of the Nysa-Polana complex.
Polana has a diameter of 55 km. It has a dark carbon-rich surface with an albedo of 0.045. It rotates on its own axis in around 9 hours and 46 minutes.