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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, 13 April 2029.
Further observations eventually allowed astronomers in 2021 to rule out the possibility of an impact when Apophis makes the close flyby to Earth in April 2029. There's also no risk during another ...
These images represent radar observations of Apophis on March 8, 9 and 10, 2021, as it made its last close approach before its 2029 Earth encounter. The data ruled out any chance of Earth impact ...
But radar observations have suggested that Apophis is shaped roughly like a peanut – a relatively common shape among near-Earth asteroids larger than 660 feet in diameter, according to NASA. ...
One example of such a follow-up observation was for 3671 Dionysus by UKIRT, the world's largest infrared telescope at the time (1997). [64] 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]
Earth observation Third satellite ... Rendezvous with asteroid 99942 Apophis [21] Observation operations begin 8 April August 2029 Psyche: Arrival at asteroid 16 Psyche:
Observations of Apophis’ orbit around the sun in 2021 ruled out the risk of the space rock impacting Earth in 2068, according to NASA’s Center for Near-Earth Object Studies.
Before and after 2007 CA 19, 99942 Apophis was the object with the highest Palermo Scale rating. With an observation arc of 4.8 days, it had a Palermo Scale of −0.88. [2] 2007 CA 19 was discovered on February 11, 2007, by the Catalina Sky Survey at the University of University of Arizona.