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In the main asteroid belt, there appear to be two primary populations of asteroid: a dark, volatile-rich population, consisting of the C-type and P-type asteroids, with albedos less than 0.10 and densities under 2.2 g/cm 3, and a dense, volatile-poor population, consisting of the S-type and M-type asteroids, with albedos over 0.15 and densities ...
2024 YR 4 is an asteroid between 40 and 100 metres (130 and 330 ft) in diameter, classified as an Apollo-type (Earth-crossing) near-Earth object.It was discovered by the Chilean station of the Asteroid Terrestrial-impact Last Alert System (ATLAS) on 27 December 2024.
First asteroid discovered from space; source of Geminids meteor shower. 3753 Cruithne: 5: October 10, 1986: Unusual Earth-associated orbit 4179 Toutatis: 4.5×2.4×1.9: January 4, 1989: Closely approached Earth on September 29, 2004 4769 Castalia: 1.8×0.8: August 9, 1989: First asteroid to be radar-imaged in sufficient detail for 3D modeling ...
Trajectory of 2004 FH in the Earth–Moon system Goldstone radar images of asteroid 2007 PA 8 's Earth flyby in 2012. This is a list of examples where an asteroid or meteoroid travels close to the Earth. Some are regarded as potentially hazardous objects if they are estimated to be large enough to cause regional devastation.
C. List of asteroid close approaches to Earth in 2011; List of asteroid close approaches to Earth in 2012; List of asteroid close approaches to Earth in 2013
An asteroid's observed albedo usually has a strong peak or opposition surge very close to the direction opposite of the Sun. [118] Different surfaces display different levels of phase darkening, and research showed that, on top of albedo bias, this favours the discovery of silicon-rich S-type asteroids over carbon-rich C types, for example. [118]
An asteroid family is a population of asteroids that share similar proper orbital elements, such as semimajor axis, eccentricity, and orbital inclination. The members of the families are thought to be fragments of past asteroid collisions .
Asteroid impact prediction is the prediction of the dates and times of asteroids impacting Earth, along with the locations and severities of the impacts. The process of impact prediction follows three major steps: Discovery of an asteroid and initial assessment of its orbit which is generally based on a short observation arc of less than 2 weeks.