NOTABLE ASTEROIDS & KBOS
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    Antiope (minor planet 90)

    90 Antiope, artist's rendering
    Artist's rendering of the binary asteroid 90 Antiope. Credit: European Southern Observatory
    The first asteroid shown to be a binary system (see binary asteroid); its two components, each about 85 km across, are separated by about 170 km, and appear to be rubble piles consisting of about 30 percent empty space (see rubble-pile asteroid). They complete an orbit around one another every 16.5 hours. Antiope was discovered in 1866 by the German astronomer R. Luther and is a member of the Themis family, located in the outer part of the main asteroid belt.


    spectral class C
    albedo 0.05
    semimajor axis 3.155 AU
    perihelion 2.665 AU
    aphelion 3.645 AU
    eccentricity 0.155
    inclination 2.2°
    period 5.60 years


    Related entry

       • Antiope in mythology (Encyclopedia of History)


    Related category

       • NOTABLE ASTEROIDS, CENTAURS, AND KUIPER BELT OBJECTS





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