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As of 2021, 2021 PH 27 holds the record for the smallest semi-major axis (0.46 AU) and shortest orbital period (114 days) of any known asteroid, supplanting 2019 LF 6 and 594913 ꞌAylóꞌchaxnim (0.56 AU, 151 days). For comparison, Mercury has a semi-major axis of 0.39 AU and an orbital period of 88 days. [14]
The meteoroid entered at a record speed of 64,000 ± 1,600 mph (28.6 ± 0.7 km/s), the fastest fireball on record from which meteorites were later recovered. [9] It broke apart at an altitude of 157,000 ft (48 km), the highest breakup event on record resulting in meteorites on the ground.
First asteroid discovered from space; source of Geminids meteor shower. 3753 Cruithne: 5: October 10, 1986: Unusual Earth-associated orbit 4179 Toutatis: 4.5×2.4×1.9: January 4, 1989: Closely approached Earth on September 29, 2004 4769 Castalia: 1.8×0.8: August 9, 1989: First asteroid to be radar-imaged in sufficient detail for 3D modeling ...
It's an asteroid, first spotted by an observatory in White Sands, New Mexico. Astronomers estimate On Jan. 26, you might be able to see 2004 BL86 skim past Earth.
The size, trajectory, and speed of the asteroid immediately made it a cause of concern. ... Once 2024 YR4’s NEO status was established, ATLAS astronomers acted fast, ...
2014 RC is a sub-kilometer near-Earth object and Apollo asteroid.The exceptionally fast rotator passed within 0.000267 AU (39,900 km; 24,800 mi) (0.1 lunar distances) of Earth on 7 September 2014.
This is a list of fast rotators—"minor planets" (which includes asteroids) that have an exceptionally short rotation period, i.e. high rotation rate or spin rate. In some cases the rotation period is not constant because the object tumbles (see List of tumblers ).
An asteroid nearly the size of a football field now has roughly a 0.28% chance of hitting Earth in about eight years, NASA says — though at one point earlier its estimate reached as high as 3.1% ...