(308635) 2005 YU55 provisionally known as 2005 YU55 is a potentially hazardous asteroid 360±40 meters in diameter as measured after its Earth flyby. Previously it was estimated at 310 meters or about 400 m (1300 feet) in diameter. It was discovered on 28 December 2005 by Robert S. McMillan at Steward Observatory Kitt Peak. On 8 November 2011 it passed 0.85 lunar distances (324900 kilometers; 201900 miles) from Earth.
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apoapsis (km)
2.44278e+11
orbital period (μ)
3.85003e+07
periapsis (km)
9.75991e+10
absolute magnitude
21.3
albedo
0.042
discovery date
2005-12-28
discoverer
Robert S. McMillan (astronomer), List of observatory codes
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