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Asteroid 5, the fifth asteroid to be discovered, by the German amateur astronomer Karl Ludwig Hencke (1793–1866) in 1845. Astraea is an S-class asteroid of diameter 120 km. Its orbit has a semimajor axis of 2.577 AU, period 4.14 years, perihelion 2.09 AU, aphelion 3.07 AU, and inclination 5°.4.

Subjects: Astronomy and Astrophysics.

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