Matches in DBpedia 2016-04 for { <http://wikidata.dbpedia.org/resource/Q20717849> ?p ?o }
- Q20717849 subject Q6422878.
- Q20717849 abstract "The following is a list of parabolic and hyperbolic comets in the Solar System. Many of these comets may come from the Oort cloud, or perhaps even have interstellar origin. Due to the Oort Cloud not being gravitationally attracted enough to the Sun to form into a fairly thin disk, like the inner Solar System, comets originating from it can come from roughly any orientation, and many even orbit retrograde. By definition, a hyperbolic orbit means that the comet will only travel through the Solar System once, with the Sun acting as a gravitational slingshot, sending the comet hurtling out of the Solar System entirely unless its eccentricity is otherwise changed. Comets orbiting in this way still originate from the Solar System, however. Typically comets in the Oort Cloud are thought to have roughly circular orbits around the Sun, but their orbital velocity is so slow that they are easily perturbed by passing stars and the galactic tide.Prior to finding a well-determined orbit for comets, the JPL Small-Body Database and the Minor Planet Center list comet orbits as having an assumed eccentricity of 1.0. In the list below, a number of comets discovered by the SOHO space telescope have eccentricities of exactly 1.0, because most orbits are based on only an observation arc of several hours or minutes. The SOHO satellite observes the corona of the Sun and the area around it, and as a result often observes sungrazing comets, including the Kreutz sungrazers. Although officially given an assumed eccentricity of 1.0, the Kreutz sungrazers have an orbital period of roughly 750 years, and originate from the progenitor of the Great Comet of 1106. Many of the Kreutz sungrazers additionally don't survive perihelion, as they are quite literally "sungrazers" – on average their perihelion distance is roughly 0.0050 astronomical unit (AU), and the radius of the Sun is 0.0046 AU.The Kreutz sungrazers have a perihelion distance of ~0.0050 AU, an inclination of 144 degrees, and an orbital period of roughly 750 years. Three other sungrazing groups, the Meyer, Marsden, and Kracht groups, have a perihelion distance of 0.035, 0.044, and 0.049 AU, an inclination of 72, 13, and 26 degrees, and a period of at least a decade, 5.6, and 3–4 years.Some comets in this list are designated with an X-designation. This is for comets whose orbits have not been calculated for various reasons, often that they were observed so long ago that nobody bothered writing down the location of them well enough for an orbit to be determined, or that they were observed in modern times over such a short period that their long-term orbit was too uncertain to calculate.".
- Q20717849 thumbnail Kuiper_oort-en.svg?width=300.
- Q20717849 wikiPageWikiLink Q1022612.
- Q20717849 wikiPageWikiLink Q1022613.
- Q20717849 wikiPageWikiLink Q1060455.
- Q20717849 wikiPageWikiLink Q1075600.
- Q20717849 wikiPageWikiLink Q112591.
- Q20717849 wikiPageWikiLink Q1140499.
- Q20717849 wikiPageWikiLink Q115612.
- Q20717849 wikiPageWikiLink Q1163286.
- Q20717849 wikiPageWikiLink Q1165635.
- Q20717849 wikiPageWikiLink Q1169750.
- Q20717849 wikiPageWikiLink Q11821.
- Q20717849 wikiPageWikiLink Q11833.
- Q20717849 wikiPageWikiLink Q1188874.
- Q20717849 wikiPageWikiLink Q1194959.
- Q20717849 wikiPageWikiLink Q1227921.
- Q20717849 wikiPageWikiLink Q123536.
- Q20717849 wikiPageWikiLink Q1247098.
- Q20717849 wikiPageWikiLink Q124960.
- Q20717849 wikiPageWikiLink Q1335309.
- Q20717849 wikiPageWikiLink Q1338357.
- Q20717849 wikiPageWikiLink Q1338777.
- Q20717849 wikiPageWikiLink Q1353961.
- Q20717849 wikiPageWikiLink Q1354016.
- Q20717849 wikiPageWikiLink Q1361158.
- Q20717849 wikiPageWikiLink Q1366848.
- Q20717849 wikiPageWikiLink Q1382003.
- Q20717849 wikiPageWikiLink Q1384353.
- Q20717849 wikiPageWikiLink Q1398937.
- Q20717849 wikiPageWikiLink Q1410755.
- Q20717849 wikiPageWikiLink Q14278.
- Q20717849 wikiPageWikiLink Q142922.
- Q20717849 wikiPageWikiLink Q1441283.
- Q20717849 wikiPageWikiLink Q14524.
- Q20717849 wikiPageWikiLink Q1452552.
- Q20717849 wikiPageWikiLink Q1548760.
- Q20717849 wikiPageWikiLink Q155013.
- Q20717849 wikiPageWikiLink Q159653.
- Q20717849 wikiPageWikiLink Q16027002.
- Q20717849 wikiPageWikiLink Q16333724.
- Q20717849 wikiPageWikiLink Q165301.
- Q20717849 wikiPageWikiLink Q16745108.
- Q20717849 wikiPageWikiLink Q1699691.
- Q20717849 wikiPageWikiLink Q1700287.
- Q20717849 wikiPageWikiLink Q1749185.
- Q20717849 wikiPageWikiLink Q1774712.
- Q20717849 wikiPageWikiLink Q1811.
- Q20717849 wikiPageWikiLink Q182766.
- Q20717849 wikiPageWikiLink Q18379526.
- Q20717849 wikiPageWikiLink Q18379527.
- Q20717849 wikiPageWikiLink Q191684.
- Q20717849 wikiPageWikiLink Q1996384.
- Q20717849 wikiPageWikiLink Q2045745.
- Q20717849 wikiPageWikiLink Q2046694.
- Q20717849 wikiPageWikiLink Q204999.
- Q20717849 wikiPageWikiLink Q20717848.
- Q20717849 wikiPageWikiLink Q20717865.
- Q20717849 wikiPageWikiLink Q207247.
- Q20717849 wikiPageWikiLink Q208474.
- Q20717849 wikiPageWikiLink Q211221.
- Q20717849 wikiPageWikiLink Q213563.
- Q20717849 wikiPageWikiLink Q213664.
- Q20717849 wikiPageWikiLink Q2278700.
- Q20717849 wikiPageWikiLink Q231618.
- Q20717849 wikiPageWikiLink Q232856.
- Q20717849 wikiPageWikiLink Q2441216.
- Q20717849 wikiPageWikiLink Q2444771.
- Q20717849 wikiPageWikiLink Q2478454.
- Q20717849 wikiPageWikiLink Q2478467.
- Q20717849 wikiPageWikiLink Q252115.
- Q20717849 wikiPageWikiLink Q254405.
- Q20717849 wikiPageWikiLink Q2544094.
- Q20717849 wikiPageWikiLink Q2568729.
- Q20717849 wikiPageWikiLink Q2576640.
- Q20717849 wikiPageWikiLink Q27122.
- Q20717849 wikiPageWikiLink Q273159.
- Q20717849 wikiPageWikiLink Q279202.
- Q20717849 wikiPageWikiLink Q2855752.
- Q20717849 wikiPageWikiLink Q29061.
- Q20717849 wikiPageWikiLink Q2930508.
- Q20717849 wikiPageWikiLink Q2991512.
- Q20717849 wikiPageWikiLink Q301109.
- Q20717849 wikiPageWikiLink Q3036394.
- Q20717849 wikiPageWikiLink Q310479.
- Q20717849 wikiPageWikiLink Q311022.
- Q20717849 wikiPageWikiLink Q312021.
- Q20717849 wikiPageWikiLink Q312416.
- Q20717849 wikiPageWikiLink Q312448.
- Q20717849 wikiPageWikiLink Q313791.
- Q20717849 wikiPageWikiLink Q31428.
- Q20717849 wikiPageWikiLink Q314284.
- Q20717849 wikiPageWikiLink Q314299.
- Q20717849 wikiPageWikiLink Q314667.
- Q20717849 wikiPageWikiLink Q318601.
- Q20717849 wikiPageWikiLink Q319225.
- Q20717849 wikiPageWikiLink Q319289.
- Q20717849 wikiPageWikiLink Q3198754.
- Q20717849 wikiPageWikiLink Q320638.