Antiope

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Antiope
90 Antiope is a double asteroid in the outer asteroid belt. Since each component is about 86±1 km across, with their centers separated by only about 171 kilometers, the gap separating the two halves is about the same as the diameter of each component. As a result, the two bodies orbit around the common center of mass which lies in the space between them. Like most bodies in this region, the components of the Antiope system are of the dark C spectral type, indicating a carbonaceous composition. The low density (1.3±0.2 g/cm³) of its components suggests a significant porosity (>30%), indicating rubble-pile asteroids composed of debris that accumulated in the aftermath of a previous asteroid collision, possibly the one that formed the Themis family. 90 Antiope - Wikipedia, the free encyclopedia
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Short Description 90 Antiope is a double asteroid in the outer asteroid belt. Since each component is about 86±1 km across, with their centers separated by only about 171 kilometers, the gap separating the two halves is about the same as the diameter of each component. As a result, the two bodies orbit around the common center of mass which lies in the space between them. Like most bodies in this region, the components of the Antiope system are of the dark C spectral type, indicating a carbonaceous composition. The low density (1.3±0.2 g/cm³) of its components suggests a significant porosity (>30%), indicating rubble-pile asteroids composed of debris that accumulated in the aftermath of a previous asteroid collision, possibly the one that formed the Themis family. 90 Antiope - Wikipedia, the free encyclopedia
Discovered by Robert Luther
Discovery date October 1, 1866
Type Asteroid
AddInfo Themis family
Satellite of Sun
Minor planet number 90
Orbit Prograde
Satellites Has satellites
Apoapsis 09 545 940 000 km
Periapsis 09 398 020 000 km
Semi-major axis 09 471 190 000 km
Distance from Sun 01 3.155 au
Eccentricity 0.156 70
Orbital period 2046.9 days | 5.60 years
Orbital speed 02 16.66 km/s
Mean anomaly 304.12°
Inclination to the ecliptic 002.2195°
Longitude of the ascending node 070.21°
Argument of periapsis 242.96°
Diameter/Size 02 87.8 km
Dimensions 93.0×87.0×83.6 km
Mass 1017×4.2 kg
Density 01 1.25 ± 0.05 g/cm3
Surface gravity  0.03 − 0.04 m/s2
Escape velocity 02 35−40 m/s
Rotation period 0.687 day | 16.50 hours
Albedo geometric 0.060
Temperature mean 02 158 K | −115 C
Temperature max 02 244 K | −29°
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