142 Polana
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Discovery[1] and designation
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| Discovered by | Johann Palisa |
| Discovery date | January 28, 1875 |
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Designations
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| Minor planet category |
Main belt |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 410.905 Gm (2.747 AU) |
| Perihelion | 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) |
| Average orbital speed | 19.07 km/s |
| Mean anomaly | 303.362° |
| Inclination | 2.238° |
| Longitude of ascending node | 291.352° |
| Argument of perihelion | 292.205° |
| 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.
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