Scattered Disk Object
Scattered Disk Objects ( SDOs also Scattered Disc Objects , Scattered Kuiper Belt Objects , SKBOs, literally scattered Kuiper Belt Objects ) are trans-Neptunian objects in the Kuiper Belt with highly eccentric orbits . This means that their orbital radii run outside the orbit of the planet Neptune , and their orbits havea clearly to extremely elliptical shapewith a numerical eccentricity of about 0.3 to over 0.99. The name Scattered Objects ( German scattered objects ) refers to their presumed mode of creation.
Emergence
According to current models, like all Kuiper belt objects , scattered disk objects were created outside the orbit of Neptune in the planetary accretion disk of the solar system . At first they had more or less circular orbits, but over time they gradually became more eccentric under the influence of the gravitation of the gas giants ( Jupiter , Saturn , Uranus and Neptune ). Since this process depends on the respective planet / object constellations, it is accompanied by a scattered distribution of the object trajectories, which gives these objects their name.
Well-known representatives
The largest known SDO is the dwarf planet Eris . The object has a moon and is currently at a distance of 97 AU (14.6 billion km). Eris moves on a strongly eccentric and inclined path that takes her to an apheld distance of almost 100 AU.
In another representative of the SDOs, the asteroid (87269) 2000 OO 67 , the orbit is so eccentric that its perihelion is within the orbit of Neptune and its aphelion is more than 1,000 AU from the sun.
Other known SDOs:
literature
- Alessandro Morbidelli : Origin and Dynamical Evolution of Comets and their Reservoir. Lectures on comets dynamics and outer solar system formation . In: Astrophysics (astro-ph) . December 9, 2005, arxiv : astro-ph / 0512256 .