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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.
Yes, astronomers point to asteroid 99942 Apophis, 1,099 feet wide and first identified in 2004. According to NASA officials, at the time of its initial sighting, Apophis was one of the most ...
The term was coined by P. W. Chodas in 1999. It gained some public interest when it became clear, in January 2005, that the asteroid 99942 Apophis would miss the Earth in 2029 but may go through one or another keyhole leading to impacts in 2036 or 2037. Further research has since been done, however, which revealed the probability of Apophis ...
The asteroid, previously known as 99942, is estimated to be around 1,100 feet wide and was only discovered in 2004. At the time, Apophis was thought to be on a trajectory toward Earth.
The close approach of the asteroid Apophis to the Earth and Moon on Friday, April 13, 2029. Ramses, or Rapid Apophis Mission for Space Safety, is a proposed European Space Agency (ESA) mission to a near-Earth asteroid 99942 Apophis. If approved, it is expected to be launched in April 2028 and to arrive at Apophis in February 2029 before its ...
In a bit of ominous news befitting a Friday the 13th: It turns out that the asteroid Apophis could have a very small chance of colliding into Earth in five years, when it is expected to make a ...
99942 Apophis: 0.3: June 19, 2004: First asteroid to rank greater than one on the Torino Scale (it was ranked at 2, then 4; now down to 0). Previously better known by its provisional designation 2004 MN 4. 152830 Dinkinesh I Selam: 0.22: November 1, 2023: First satellite discovered to be a contact-binary (433953) 1997 XR 2: 0.23: December 4, 1997
A second example was the 2013 ESA Herschel Space Observatory follow-up observations of 99942 Apophis, which showed it was 20% larger and 75% more massive than previously estimated. [65] However such follow-ups are rare. The size estimates of most near-Earth asteroids are based on visible light only. [66]