(308635) 2005 YU55
Asteroid
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(308635) 2005 YU₅₅, provisionally named 2005 YU₅₅, is a potentially hazardous asteroid 360±40 meters in diameter, as measured after its Earth flyby. Previously it was estimated to be 310 meters or about 400 m in diameter. It was discovered on 28... Wikipedia
Mass: 49.88 billion kg
Discovered: December 28, 2005
Orbital period: 455 days
Discoverer: Robert S. McMillan