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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.
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.
NASA's Center for Near-Earth Object Studies announces that the chances of asteroid 2024 YR4 impacting Earth on 22 December 2032 has increased to 3.1% (1-in-32) following further observations of its orbital trajectory. It has now surpassed the threat of 99942 Apophis which once had a 2.7% chance of hitting Earth during 2004 before later being ...
The only objects on the Torino scale that have ever ranked higher are asteroids 99942 Apophis, which had a rating of 4 for four days in late 2004, the highest recorded rating; (144898) 2004 VD 17, with a historical rating of 2 from February to May 2006; and 2024 YR 4, with a rating of 3 from January 27, 2025 to February 20, 2025.
Upon gathering further observational data and assessment, scientists ruled out the impact probability for Apophis, for now, with a small chance of impact in 2068 declared unlikely. As for 2024 YR4 ...
Astronomer Paul Wiegert had found a scenario in which Apophis could be sent careening into Earth in 2029. But we’d have to be extremely unlucky. Asteroid Apophis has the tiniest chance of ...
Ramses, or Rapid Apophis Mission for Space Safety, is a proposed ESA mission to a near-Earth asteroid 99942 Apophis.If approved, it is expected to be launched in April 2028, to arrive at Apophis in February 2029, before its closest approach to Earth.
In 2020, astronomers confirmed Yarkovsky acceleration of the asteroid 99942 Apophis. The findings are relevant to asteroid impact avoidance as 99942 Apophis was thought to have a very small chance of Earth impact in 2068, and the Yarkovsky effect was a significant source of prediction uncertainty.