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The discovery of Apophis in 2004 is rather surprising because it is estimated that an asteroid as big or bigger coming so close to Earth happens only once in 800 years on average. [ 16 ] [ 14 ] Such an asteroid is expected to actually hit Earth once in about 80,000 years.
First "big four" asteroid visited by a spacecraft, largest asteroid visited by a spacecraft at the time ... 99942 Apophis: 0.3: June 19, 2004: First asteroid to rank ...
A menacing asteroid named Apophis is projected to have a close encounter with Earth in 2029, but scientists have long ruled it out as an impact risk. ... How big is the Apophis asteroid?
On December 24, 2004, 370 m (1,210 ft) asteroid 99942 Apophis (at the time yet unnamed and therefore known only by its provisional designation 2004 MN 4) was assigned a 4 on the Torino scale, the highest rating given to date, as the information available at the time translated to a 1.6% chance of Earth impact in April 2029. [91]
How big is asteroid 2008 OS7? ... First discovered in 2004, Asteroid 99942 Apophis measures across at 1,100 feet and is expected to make a very close brush with Earth in the next five years.
A space rock the size of a cruise liner will closely pass Earth in April 2029. While the asteroid Apophis won’t hit Earth, two spacecraft may tag along.
(99942) Apophis (a near-Earth asteroid 370 meters in diameter) became the first object rated level 2 on 23 December 2004, [88] and was subsequently upgraded to level 4 — the current record for highest Torino rating. [88] (It is now known Apophis will pass 38000 km from Earth on 13 April 2029.)
Images of the asteroid Apophis, captured in 2012, allowed scientists to determine that it will not strike Earth during a close flyby in 2036. ... An approach this close from an asteroid this big ...