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142 Polana
From Wikipedia, the free encyclopedia
| Discovery[1] and Designation | |
|---|---|
| Discovered by: | Johann Palisa |
| Discovery date: | January 28, 1875 |
| Alternative names: [2] | |
| Minor planet category: | Main belt |
| Orbital characteristics[3] | |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion distance: | 410.905 Gm (2.747 AU) |
| Perihelion distance: | 312.439 Gm (2.089 AU) |
| Semi-major axis: | 361.672 Gm (2.418 AU) |
| Eccentricity: | 0.136 |
| Orbital period: | 1373.038 d (3.76 a) |
| Avg. orbital speed: | 19.07 km/s |
| Mean anomaly: | 303.362° |
| Inclination: | 2.238° |
| Longitude of ascending node: | 291.352° |
| Argument of perihelion: | 292.205° |
| Physical characteristics | |
| Dimensions: | 55.3 km |
| Mass: | 1.8×1017 kg |
| Mean density: | 2.0 g/cm³ |
| Equatorial surface gravity: | 0.0155 m/s² |
| Equatorial Escape velocity: | 0.0292 km/s |
| Sidereal rotation period: | ? d |
| Axial tilt: | ?° |
| Pole ecliptic latitude: | ? |
| Pole ecliptic longitude: | ? |
| Geometric albedo: | 0.10 |
| Temperature: | ~179 K |
| Spectral type: | F |
| Absolute magnitude: | 10.27 |
142 Polana is a very dark Main belt asteroid. It is a primitive carbonaceous asteroid of type F (a subdivision of more common C-type).
It is a major member of the Polana family, which is a subgroup of the Nysa family.
It was discovered by Johann Palisa on January 28, 1875, and named after the city of Pola (now Pula, Croatia) where he made the discovery.
| Minor planets | ||
|---|---|---|
| Previous minor planet | 142 Polana | Next minor planet |
| List of asteroids | ||
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.