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The Oort cloud (/ ɔːr t, ʊər t /), [1] sometimes called the Öpik–Oort cloud, [2] is theorized to be a vast cloud of icy planetesimals surrounding the Sun at distances ranging from 2,000 to 200,000 AU (0.03 to 3.2 light-years). [3] [note 1] [4] The concept of such a cloud was proposed in 1950 by the Dutch astronomer Jan Oort, in whose ...
The Oort cloud (/ ɔːr t, ʊər t /), sometimes called the Öpik–Oort cloud, is theorized to be a vast cloud of icy planetesimals surrounding the Sun at distances ranging from 2,000 to 200,000 AU (0.03 to 3.2 light-years). The concept of such a cloud was proposed in 1950 by the Dutch astronomer Jan Oort, in whose honor the
The Kuiper belt, scattered disk, and Oort cloud are three conventional divisions of this volume of space. [1] [nb 1] As of February 2024, the catalog of minor planets contains 1060 numbered TNOs. In addition, there are more than 3,500 unnumbered TNOs, which have been observed since 1993. [3] [4] [5] [6]
Description 134340 Pluto: A dwarf planet, the first and largest trans-Neptunian object (TNO) discovered. It is the only TNO known to have an atmosphere. Hosts a system of five satellites and is the prototype plutino. 15760 Albion: The prototype classical Kuiper belt object (KBO), the first TNO discovered after Pluto (385185) 1993 RO
2012 VP 113 (possibly inner Oort cloud) Sedna, a dwarf planet (possibly inner Oort cloud) Oort cloud (hypothetical) Hills cloud/inner Oort cloud; Outer Oort cloud; The Solar System also contains: Comets. List of periodic comets; List of near-parabolic comets; Small objects, including: Meteoroids; Interplanetary dust. Helium focusing cone ...
Simulations indicate that it has most likely come from the Oort cloud, with a roughly equal probability of being an extinct comet and a rocky body that was originally scattered into the Oort cloud. The discovery of 1996 PW prompted theoretical research that suggests that roughly 1 to 2 percent of the Oort cloud objects are rocky. [2] [10]
Following the discovery of Leleākūhonua, Sheppard et al. concluded that it implies a population of about 2 million inner Oort cloud objects larger than 40 km (25 mi), with a combined total mass of 1 × 10 22 kg, about the mass of Pluto (a fraction the mass of Earth's moon but several times the mass of the asteroid belt). [5]
Figure 1: Geometry of the Oort constants derivation, with a field star close to the Sun in the midplane of the Galaxy. Consider a star in the midplane of the Galactic disk with Galactic longitude at a distance from the Sun. Assume that both the star and the Sun have circular orbits around the center of the Galaxy at radii of and from the Galactic Center and rotational velocities of and ...