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First asteroid discovered by means of astrophotography rather than visual observation 433 Eros: 13×13×33: August 13, 1898: First near-Earth asteroid discovered and the second largest; first asteroid to be detected by radar; first asteroid orbited and landed upon 482 Petrina: 23.3: March 3, 1902: First asteroid named after dog 490 Veritas: 115 ...
It was once expected that any icy body larger than approximately 200 km in radius was likely to be in hydrostatic equilibrium (HE). [7] However, Ceres (r = 470 km) is the smallest body for which detailed measurements are consistent with hydrostatic equilibrium, [ 8 ] whereas Iapetus (r = 735 km) is the largest icy body that has been found to ...
The asteroid’s massive size makes it 99 per cent larger than any other near-Earth objects, but will not pass close enough to see without a telescope. ... moon” as it is pulled into orbit ...
2005 ED 224 is an asteroid with an estimated diameter of 54 meters. It had the soonest virtual impactor of an asteroid larger than 50 meters in diameter with a better than 1:1,000,000 chance of impacting Earth. On 11 March 2023, the line of variations (LOV) showed a 1-in-500,000 chance of impact. [2] It has a short observation arc of 3 days.
"An object larger than about 150 meters that can approach the Earth to within this distance is termed a potentially hazardous object." The asteroid first passed by Earth in 2013, ...
99942 Apophis (provisional designation 2004 MN 4) is a near-Earth asteroid and a potentially hazardous object, 450 metres (1,480 ft) by 170 metres (560 ft) in size, [3] that caused a brief period of concern in December 2004 when initial observations indicated a probability of 2.7% that it would hit Earth on Friday, April 13, 2029.
The asteroid's path drastically will be altered by Earth's gravity once it zips by. Instead of circling the sun every 359 days, it will move into an oval orbit lasting 425 days, according to NASA.
It is a Mercury-, Venus-, Earth-and Mars-crossing asteroid. With an observation arc of 14 years, it has a well determined orbit and was last observed in 2016. [3] It is classified as an Apollo asteroid [3] because it is a near-Earth asteroid with a semi-major axis larger than Earth's.