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- Sednoid abstract "A sednoid is a trans-Neptunian object with a perihelion greater than 50 AU and a semi-major axis greater than 150 AU (The two known objects have perihelia greater than 75 AU). These objects lie outside an apparently nearly empty gap in the Solar System starting at about 50 AU, and have no significant interaction with the planets. Only two objects are known from this population, 90377 Sedna and 2012 VP113, but it is suspected that there are many more. They are included with the detached objects. Some astronomers, such as Scott Sheppard, consider the sednoids to be inner Oort cloud objects (OCOs), though the inner Oort cloud, or Hills cloud, was originally predicted to lie beyond 2,000 AU, several times as far as the aphelia of the two known sednoids. Sednoids are puzzling because their orbits cannot be explained by perturbations from the gas giant planets. If they formed in their current locations, their orbits must originally have been circular; otherwise accretion (the coalescence of smaller bodies into larger ones) would not have been possible because the large relative velocities between planetesimals would have been too disruptive. Their present-day elliptical orbits can be explained by a number of hypotheses: These objects could have had their orbits and perihelion distances "lifted" by the passage of a nearby star when the Sun was still embedded in its birth star cluster. Their orbits could have been disrupted by an as-yet-unknown planet-sized body within the Oort cloud. They could have been captured from around passing stars, most likely in the Sun's creche.Of these, the stellar disruption and "lift" hypothesis appears to agree most closely with observations.All of the more extreme detached objects, objects with semi-major axes > 150 AU and perihelia > 30 AU (the orbit of Neptune), have a similar orientations (argument of perihelion) of ≈ 0° (338°±38°). This is unexpected, and may have something to do with their origin. Twelve known objects have a semi-major axis > 150 AU, a perihelion beyond Neptune, and an argument of perihelion of 340 ± 55°.".
- Sednoid thumbnail Sedna-NASA.JPG?width=300.
- Sednoid wikiPageID "42520223".
- Sednoid wikiPageRevisionID "604766101".
- Sednoid subject Category:Oort_cloud.
- Sednoid subject Category:Scattered_disc_and_detached_objects.
- Sednoid comment "A sednoid is a trans-Neptunian object with a perihelion greater than 50 AU and a semi-major axis greater than 150 AU (The two known objects have perihelia greater than 75 AU). These objects lie outside an apparently nearly empty gap in the Solar System starting at about 50 AU, and have no significant interaction with the planets. Only two objects are known from this population, 90377 Sedna and 2012 VP113, but it is suspected that there are many more.".
- Sednoid label "Sednoid".
- Sednoid sameAs m.010f8ldp.
- Sednoid sameAs Q17148298.
- Sednoid sameAs Q17148298.
- Sednoid wasDerivedFrom Sednoid?oldid=604766101.
- Sednoid depiction Sedna-NASA.JPG.
- Sednoid isPrimaryTopicOf Sednoid.