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142 Polana - Simple English Wikipedia, the free encyclopedia

142 Polana

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142 Polana
Discovery[1] and Designation
Discovered by: Johann Palisa
Discovery date: January 28, 1875
Orbital characteristics[2]
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)
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 made of carbonates and is an F-type asteroid (a part of the more common C-type).

It is a major member of the Polana family, which is a part of the Nysa family.

It was found by Johann Palisa on January 28, 1875, and named after the city of Pola (now Pula, Croatia) where he found the asteroid.

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