Origin of asteroids
نویسندگان
چکیده
منابع مشابه
Origin and Evolution of Trojan Asteroids
The regions around the L4 and L5 Lagrangian points of Jupiter are populated by two large swarms of asteroids called the Trojans. They may be as numerous as the main-belt asteroids and their dynamics is peculiar, involving a 1:1 resonance with Jupiter. Their origin probably dates back to the formation of Jupiter: the Trojan precursors were planetesimals orbiting close to the growing planet. Diff...
متن کاملOrigin of the Spacewatch Small Earth-Approaching Asteroids
sions which reach Earth-crossing or near Earth-crossing orbits via a chaotic resonance zone (e.g., the 3 : 1 meanRecent discoveries of small Earth-approaching asteroids by the 0.9 m Spacewatch telescope (referred to here as S-SEAs) motion resonance with Jupiter, the n6 secular resonance). reveal 16 objects which have diameters p50 m or smaller. However, many factors complicate this scenario: (a...
متن کاملEURONEAR - Data Mining of Asteroids and Near Earth Asteroids
Besides new observations, mining old photographic plates and CCD image archives represents an opportunity to recover and secure newly discovered asteroids, also to improve the orbits of Near Earth Asteroids (NEAs), Potentially Hazardous Asteroids (PHAs) and Virtual Impactors (VIs). These are the main research aims of the EURONEAR network. As stated by the IAU, the vast collection of image archi...
متن کاملEarly Impact History and Dynamical Origin of Differentiated Meteorites and Asteroids
Laboratory studies of igneously formed meteorites suggest that numerous meteorite parent bodies were melted to form metallic cores and silicate mantles. Studies by the Dawn spacecraft confirm that (4) Vesta melted in this way (McSween et al., 2013; see the chapter by Russell et al. in this volume). In principle, one would think the origin of iron and stonyiron meteorites and achondrites would b...
متن کاملYarkovsky origin of the unstable asteroids in the 2/1 mean motion resonance with Jupiter
The 2/1 mean motion resonance with Jupiter, intersecting the main asteroid belt at ≈3.27 au, contains a small population of objects. Numerical investigations have classified three groups within this population: asteroids residing on stable orbits (i.e. Zhongguos), those on marginally stable orbits with dynamical lifetimes of the order of 100 Myr (i.e. Griquas), and those on unstable orbits. In ...
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ژورنال
عنوان ژورنال: Nature
سال: 1974
ISSN: 0028-0836,1476-4687
DOI: 10.1038/248550a0