Wikipedia definition
1. 1566 Icarus1566 Icarus is an Apollo asteroid (a sub-class of near-Earth asteroid) that at perihelion comes closer to the Sun than Mercury, i.e. it is a Mercury-crossing asteroid. It is also a Venus and Mars-crosser. It is named after Icarus of Greek mythology, who flew too close to the Sun. It was discovered in 1949 by Walter Baade. Icarus makes a close approach to Earth at gaps of 9, 19, or 38 years. Rarely, it comes as close as 6.4 Gm (16 lunar distances and 4 million miles), as it did on June 14, 1968.
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