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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).
(436724) 2011 UW 158, provisionally known as 2011 UW 158, is a stony, walnut-shaped asteroid and fast rotator, classified as near-Earth object and potentially hazardous asteroid of the Apollo group, approximately 300 meters in diameter.
More than one asteroid per year may be listed if its geocentric distance [note 1] is within a tenth of the lunar distance, or 0.10 LD. For comparison, since a satellite in a geostationary orbit has an altitude of about 36,000 km (22,000 mi), then its geocentric distance is 0.11 LD (approximately three times the width of the Earth).
Goldstone radar images of asteroid 99942 Apophis on 8–10 March 2021 Goldstone radar images of asteroid 2001 FO 32 during closest approach on 21 March 2021. Below is an example list of near-Earth asteroids that passed or will pass more than 1 lunar distance (384,400 km or 0.00256 AU) from Earth in 2021.
3200 Phaethon (/ ˈ f eɪ. ə ˌ θ ɒ n /; previously sometimes spelled Phæton), provisionally designated 1983 TB, is an active [8] Apollo asteroid with an orbit that brings it closer to the Sun than any other named asteroid (though there are numerous unnamed asteroids with smaller perihelia, such as (137924) 2000 BD 19). [9]
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Amid growing anxieties surrounding reported drone sightings, the FBI has issued a warning against a new trend of pointing lasers at aircrafts.
Trajectory of asteroid 2005 YU 55 compared with the orbits of Earth and the Moon on 8–9 November 2011. Apparent trajectory on 8–9 November 2011. In February 2010, (308635) 2005 YU 55 was rated 1 on the Torino Scale for a potential pass near Earth on 10 November 2103, [12] that posed no unusual level of danger.