Scattered Disc

The scattered disc (or scattered disk) is a distant region of the Solar System that is sparsely populated by icy minor planets, a subset of the broader family of trans-Neptunian objects. The scattered-disc objects (SDOs) have orbital eccentricities ranging as high as 0.8, inclinations as high as 40°, and perihelia greater than 30 astronomical units (4.5×109 km; 2.8×109 mi). These extreme orbits are believed to be the result of gravitational "scattering" by the gas giants, and the objects continue to be subject to perturbation by the planet Neptune. While the nearest distance to the Sun approached by scattered objects is about 30–35 AU, their orbits can extend well beyond 100 AU. This makes scattered objects "among the most distant and cold objects in the Solar System". The innermost portion of the scattered disc overlaps with a torus-shaped region of orbiting objects traditionally called the Kuiper belt, but its outer limits reach much farther away from the Sun and farther above and below the ecliptic than the belt proper.

Because of its unstable nature, astronomers now consider the scattered disc to be the place of origin for most periodic comets observed in the Solar System, with the centaurs, a population of icy bodies between Jupiter and Neptune, being the intermediate stage in an object's migration from the disc to the inner Solar System. Eventually, perturbations from the giant planets send such objects towards the Sun, transforming them into periodic comets. Many Oort-cloud objects are also believed to have originated in the scattered disc.

Read more about Scattered DiscDiscovery, Subdivisions of Trans-Neptunian Space, Orbits, Formation, Composition, Comets

Other articles related to "scattered disc, disc, scattered":

Hills Cloud
... The Kuiper belt and the scattered disc, the other two reservoirs of trans-Neptunian objects, are less than one thousandth of the Oort cloud's distance ... Oort cloud is thought to comprise two separate regions a spherical outer Oort cloud and a disc-shaped inner Oort cloud, or Hills cloud ... that the matter composing the Oort cloud formed closer to the Sun and was scattered far out into space by the gravitational effects of the giant planets early in the Solar System's ...
Detached Object - Classification
... belt objects (KBOs) Classical KBOs (Cubewanos) Resonant KBOs Plutinos (23 Resonance) Scattered disc objects (SDOs) Resonant SDOs Detached objects Oort cloud objects (OCOs ... However, there are no clear boundaries between the scattered and detached regions, since both can coexist as TNOs in an intermediate region with perihelion distance between 37 and 40 AU ... (more likely) transitional objects between the scattered disc and the inner Oort cloud ...
Scattered Disc - Comets
... and that these comets originate from the more dynamic scattered disc ... are believed to have originated from the scattered disc ... The centaurs are thought to be a dynamically intermediate stage between the scattered disc and the Jupiter family ...
Hills Cloud - Origin
... cloud is thought to be a remnant of the original protoplanetary disc that formed around the Sun approximately 4.6 billion years ago ... Models by Julio Ángel Fernández suggest that the scattered disc, which is the main source for periodic comets in the Solar System, might also be the primary source for Oort cloud objects ... According to the models, about half of the objects scattered travel outward towards the Oort cloud, while a quarter are shifted inward to Jupiter's orbit, and a quarter are ejected on hyperbolic orbits ...
Kuiper Belt
... dynamically stable, and that comets' true place of origin is the scattered disc, a dynamically active zone created by the outward motion of Neptune 4.5 billion ... The objects within the Kuiper belt, together with the members of the scattered disc and any potential Hills cloud or Oort cloud objects, are collectively referred to as trans-Neptunian objects (TNOs) ... member of the Kuiper belt, and the second largest known TNO, after the scattered-disc object Eris ...

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