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An asteroid is a minor planet—an object larger than a meteoroid that is neither a planet nor an identified comet—that orbits within the inner Solar System or is co-orbital with Jupiter (Trojan asteroids).
The asteroid's provisional designation as a minor planet, "2024 YR 4", was assigned by the Minor Planet Center when its discovery was announced on 27 December 2024. [2] The first letter, "Y", indicates that the asteroid was discovered in the second half-month of December (16 to 31 December), and "R 4" indicates that it was the 117th provisional designation to be assigned in that half-month.
2022 EB_5, Daniel W. E. Green, Central Bureau Electronic Telegram, Central Bureau for Astronomical Telegrams, 13 March 2022; 2022 EB5 at NeoDyS-2, Near Earth Objects—Dynamic Site
0.76 Space probe broke orbit on 5 September 2012 and headed to Ceres; first "big four" asteroid visited by a spacecraft, largest asteroid visited by a spacecraft at the time.
The number of bodies grows rapidly as the size decreases.Based on IRAS data there are about 140 main-belt asteroids with a diameter greater than 120 km, [6] which is approximately the transition point between surviving primordial asteroids and fragments thereof.
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.
(137108) 1999 AN 10 is a kilometer-length near-Earth asteroid and potentially hazardous asteroid of the Apollo group.It was discovered by LINEAR on 13 January 1999. [5]On 7 August 2027, this asteroid will pass at about 0.00261 AU (390,000 km; 243,000 mi; 1.02 LD) of the Earth's center.
16 Psyche (/ ˈ s aɪ k iː / SY-kee) is a large M-type asteroid, which was discovered by the Italian astronomer Annibale de Gasparis, on 17 March 1852 and named after the Greek goddess Psyche.