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158 Koronis ("kuh ROE niss") is a Main belt asteroid. It has a rather mundane size but very reflective surface. It is composed of silicate rock and metallic iron-nickel.
It was discovered by Viktor Knorre on January 4, 1876 from the Berlin observatory. It was first of his total of four asteroid discoveries.
The asteroid itself may not be spectacular, but the family of asteroids named after it is one of the most important. One member of the family, 243 Ida, has been visited by spacecraft, and gives some idea how the other asteroids in the family may look.
Based on a model constructed from the lightcurve, the shape of Koronis resembles that of Ida, although it is a bit larger. [1] (http://www.astro.helsinki.fi/~kaselain/asteroids.html)
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