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(415029) 2011 UL 21, provisional designation 2011 UL 21, is an Apollo class potentially hazardous asteroid discovered on October 17, 2011, by the Catalina Sky Survey project. [1] The asteroid is estimated to have a diameter of 2.5 kilometres (1.6 mi). It was rated at Torino Scale 1 on October 27, 2011, with an observation arc of 9.6 days. [4]
The first space rock, asteroid 2011 UL21, passed by Earth on June 27 at a distance of 4.1 million miles (6.6 million kilometers), or 17 times the distance between Earth and the moon. Researchers ...
On Thursday, meanwhile, asteroid 2011… Near miss, in this case, is a relative term: Saturday’s asteroid, 2024 MK, will come within 180,000 miles of Earth. Stadium-sized asteroid to buzz by ...
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The Torino scale is a method for categorizing the impact hazard associated with near-Earth objects (NEOs) such as asteroids and comets.It is intended as a communication tool for astronomers and the public to assess the seriousness of collision predictions, by combining probability statistics and known kinetic damage potentials into a single threat value.
A list of known near-Earth asteroid close approaches less than 1 lunar distance (384,400 km or 0.00257 AU) from Earth in 2011. [note 1] Rows highlighted red indicate objects which were not discovered until after closest approach
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Articles about astronomical objects discovered in 2011 in the parent category should be moved to this subcategory. This category is for astronomical objects discovered in 2011 . See parent category for proper sortkey usage instructions.