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Inicialmente recibió la designación provisional 2004 MN 4. Cuando su órbita pudo ser calculada con suficiente exactitud, recibió el número permanente 99942 (el 24 de junio de 2005), convirtiéndose en el primer asteroide numerado con probabilidades de colisión con la Tierra.
99942 Apophis (provisional designation 2004 MN 4) is a near-Earth asteroid and a potentially hazardous object with a diameter of 370 metres (1,210 feet) that caused a brief period of concern in December 2004 when initial observations indicated a probability up to 2.7% that it would hit Earth on April 13, 2029.
There are no observational indications of non-gravitational forces acting on Apophis over 2004-2013. The new radar data, along with new optical astrometry, permits refinement of the 2036 Earth encounter, now nominally predicted to occur at a distant 0.388 au (about 150 lunar distances).
23 de dic. de 2004 · Near-Earth Asteroid 2004 MN4 Reaches Highest Score To Date On Hazard Scale. Dec 23, 2004 • Don Yeomans, Steve Chesley and Paul Chodas • Center for NEO Studies. A recently rediscovered 400-meter Near-Earth Asteroid (NEA) is predicted to pass near the Earth on 13 April 2029.
9 de ene. de 2013 · Catalogued as asteroid (99942) Apophis (previously 2004 MN4), it is often nicknamed ‘the doomsday asteroid’ in popular media, after initial observations made after its discovery in 2004 gave it a 2.7% chance of striking Earth in April 2029.
13 de abr. de 2023 · El 13 de abril de 2029 el asteroide 2004 MN4 se aproximará a solo 30 mil kilómetros de nuestro planeta. La distancia que hay de la Tierra a la Luna es de 380 mil km. La relación entre el tamaño y...
99942 Apophis (2004 MN4) is one of the most important near-Earth asteroids ever discovered. It will make a very close Earth approach on Friday, April 13, 2029 when it will pass within 0.1 lunar distances, which is only a few Earth radii above Earth's surface.
