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There are 1888 near-Earth asteroids listed in the risk table and 41,848 virtual impact dates, so for each asteroid in the risk table, there is an average of about 22 virtual impact dates. Only about 21 objects in the table are large enough, with a diameter greater than about 140 meters, to be considered potentially hazardous objects .
Such events occur on average between once a century and once per 10,000 years. 9: A collision is certain, capable of causing unprecedented regional devastation for a land impact or the threat of a major tsunami for an ocean impact. Such events occur on average between once per 10,000 years and once per few hundred thousand years. 10
This sub-section visualises the warning times of the close approaches listed in the table of confirmed close approaches, depending on the size of the asteroid. The sizes of the charts show the relative sizes of the asteroids to scale. For comparison, the approximate size of a person is also shown.
The third-largest asteroid with an accurately measured mass, because it has moons, is 87 Sylvia at (14.76 ± 0.06) × 10 18 kg. Other large asteroids with masses measured from their moons are 107 Camilla and 130 Elektra. [3] [13] [1] For a more complete list, see List of Solar System objects by size.
The Caribbean Astronomy Society (SAC) said the "impressive" asteroid was visible across the entire Caribbean region at 7:05 p.m. local time Saturday. After hitting Earth's atmosphere, the space ...
Smallest Perihelion: 2004 FN 8 Smallest Semi-Major Axis: (164207) 2004 GU 9 Smallest Aphelion: 1991 VG Largest Perihelion: (399457) 2002 PD 43 Largest Semi-Major Axis: 1999 XS 35
An asteroid the size of a house sped past Earth at 2,000mph (7200km/h) on Sunday, June 25. The Virtual Telescope Project by Gianluca Masi in Italy recorded footage showing the near-Earth object ...
NASA has identified multiple asteroids expected to pass near Earth in the next two days, including one that is the size of a football stadium. NASA reports 'potentially hazardous' stadium-size ...