Icarus (astronomy)
In astronomy, Apollo asteroid 1.5 km/1 mi in diameter, discovered in 1949 by German-born US astronomer Walter Baade. It orbits the Sun every 409 days at a distance of 28–300 million km/18–186 million mi (0.19–2.0 astronomical units). It was the first asteroid known to approach the Sun closer than does the planet Mercury. In 1968 it passed within 6 million km/3.7 million mi of the Earth.
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