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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]
Free live stream of the space rock is available to watch on Thursday evening
An asteroid the size of a football stadium will thread the needle between Earth and the moon Saturday morning — the second of two astronomical near misses in three days. Near miss, in this case ...
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This category includes near-Earth asteroids listed as potentially hazardous objects.. The asteroids are sorted numerically by 0-padding either their minor planet number to 6 digits, or, if absent, the year of discovery when using their provisional designation.
In March 2002, (163132) 2002 CU 11 became the first asteroid with a temporarily positive rating on the Torino Scale, with about a 1 in 9,300 chance of an impact in 2049. [17] Additional observations reduced the estimated risk to zero, and the asteroid was removed from the Sentry Risk Table in April 2002. [18]
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.
Watch live as a Nasa spacecraft returns to Earth with the largest asteroid sample in history on Sunday 24 September. After a seven-year, four-billion-mile journey across space, the ambitious NASA ...