普通天文 柯伊伯带Kuiper-belt.pdf

Kuiperbelt1

Kuiperbelt

TheKuiperbelt(pron.:/ˈkaɪpər/rhyming

withviper),sometimescalledthe

Edgeworth–Kuiperbelt,isaregionofthe

SolarSystembeyondtheplanets,extending

fromtheorbitofNeptune(at30AU)to

[1]

approximately50AUfromtheSun.Itis

similartotheasteroidbelt,butitisfar

larger—20timesaswideand20to200

[2][3]

timesasmassive.Liketheasteroidbelt,

itconsistsmainlyofsmallbodies,or

remnantsfromtheSolarSystemsformation.

Whilemostasteroidsarecomposed

primarilyofrockandmetal,mostKuiper

[nb2]

beltobjectsarecomposedlargelyof

frozenvolatiles(termedices),suchas

methane,ammoniaandwater.Theclassical

beltishometoatleastthreedwarfplanets:

Pluto,Haumea,andMakemake.Someofthe

SolarSystemsmoons,suchasNeptunesKnownobjectsintheKuiperbelt,derivedfromdatafromtheMinorPlanetCenter.

TritonandSaturnsPhoebe,arealsoObjectsinthemainbeltarecoloredgreen,whilescatteredobjectsarecolored

believedtohaveoriginatedintheorange.Thefourouterplanetsareblue.Neptunesfewknowntrojansareyellow,

[4][5]whileJupitersarepink.ThescatteredobjectsbetweenJupitersorbitandthe