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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]
On Thursday, meanwhile, asteroid 2011 UL21 flew within 4 million miles. But the Saturday passage of 2024 MK — which scientists discovered only two weeks ago — coincides with a sobering ...
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.
Free live stream of the space rock is available to watch on Thursday evening
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.
The largest asteroid to pass within 1 LD of Earth in 2020 was 2020 LD with an estimated diameter of around 145 meters and an absolute magnitude of 22.4. The fastest asteroid to pass within 1 LD of Earth in 2020 was 2020 FD 2 that passed Earth with a velocity with respect to Earth of 33.4 km/s (75,000 mph). [2] [note 3]
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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.