Binary asteroid

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Binary asteroid 243 Ida with its small minor-planet moon, Dactyl, as seen by Galileo

A binary asteroid is a system of two asteroids orbiting their common barycenter. The binary nature of 243 Ida was discovered when the Galileo spacecraft flew by the asteroid in 1993. Since then numerous binary asteroids and several triple asteroids have been detected.[1]

The mass ratio of the two components of a binary system is an important characteristic. Most binary asteroids have a large mass ratio, i.e. a relatively small satellite in orbit around the main component. Systems with a small satellite, or "moon", include 87 Sylvia, 107 Camilla, 45 Eugenia, 121 Hermione, 130 Elektra, 22 Kalliope, 283 Emma, 379 Huenna and 243 Ida (in order of decreasing primary size). Some binary systems have a mass ratio near unity, i.e., two components of similar mass. They include 90 Antiope, 2006 VW139, 2017 YE5 and 69230 Hermes, with average component diameters of 86, 1.8, 0.9 and 0.3 km, respectively.

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Several theories have been posited to explain the formation of binary-asteroid systems. Many systems have significant macro-porosity (a "rubble-pile" interior). The satellites orbiting large main-belt asteroids such as 22 Kalliope, 45 Eugenia or 87 Sylvia may have formed by disruption of a parent body after impact or fission after an oblique impact. Trans-Neptunian binaries may have formed during the formation of the Solar System by mutual capture or three-body interaction. Near-Earth asteroids, which orbit in the inner part of the Solar System, most likely form by spin-up and mass shedding,[2] likely as a result of the YORP effect. Numerical simulations suggest that when solar energy spins a “rubble pile” asteroid to a sufficiently fast rate by the YORP effect, material is thrown from the asteroid's equator.[3] This process also exposes fresh material at the poles of the asteroid.[3][4]

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References[edit]

  1. ^ Margot, Jean-Luc; Pravec, Petr; Taylor, Patrick; Carry, Benoît; Jacobson, Seth (2015). "Asteroid Systems: Binaries, Triples, and Pairs". In Michel, Patrick; DeMeo, Francesca E.; Bottke, William F. Asteroids IV. p. 355. arXiv:1504.00034. Bibcode:2015aste.book..355M. doi:10.2458/azu_uapress_9780816532131-ch019. ISBN 9780816532131.
  2. ^ Margot, Jean-Luc; et al. (2002). "Binary Asteroids in the Near-Earth Object Population". Science. 296 (5572): 1445–1448. Bibcode:2002Sci...296.1445M. doi:10.1126/science.1072094. PMID 11951001.
  3. ^ a b Walsh, Kevin J.; Richardson, DC; Michel, P (June 2008). "Rotational breakup as the origin of small binary asteroids". Nature. 454 (7201): 188–191. Bibcode:2008Natur.454..188W. doi:10.1038/nature07078. PMID 18615078.
  4. ^ Study Puts Solar Spin on Asteroids, their Moons & Earth Impacts Newswise, Retrieved 14 July 2008.
  5. ^ "Hubble discovers a unique type of object in the Solar System". www.spacetelescope.org. Retrieved 21 September 2017.