K
Spectraalklasse

K
Effectieve temperatuur
3,500–5,000 K
Zonneradius
0.7–0.96 R☉
Zonsmassa
0.45–0.8 M☉

Een oranje dwerg is een hoofdreeksster met spectraalklasse K en lichtkrachtklasse V. Op de hoofdreeks ligt een oranje dwerg tussen een rode en een gele dwerg. De effectieve temperatuur van een oranje dwerg is tussen 3.900 en 5.200 K. Oranje dwergen hebben een massa tussen 0,6 en 0,9 zonnemassa. Vanwege de rustige verbranding van waterstof en de normale temperatuur kan de levensduur van zo'n ster enkele tientallen miljarden jaren bedragen. Omdat het heelal nog maar zo'n 13,7 miljard jaar oud is, is het mogelijk dat nog geen enkele oranje dwerg is opgebrand. Een oranje dwerg zal aan het einde van zijn evolutie eerst een rode reus en daarna een witte dwerg worden, en vervolgens afkoelen tot een zwarte dwerg.

Uses material from the Wikipedia article "Oranje dwerg", which is released under the Creative Commons BY-SA 3.0.
Hemellichaam AfstandWiki
3 AndromedaeStar, Infra-Red source, High proper-motion StarK176[x]
36 OphiuchiStar, Double or multiple star, Infra-Red sourceK19[x]
54 PisciumStar, Infra-Red source, High proper-motion Star, Rotationally variable Star, Variable Star, X-ray sourceK36[x]
61 CygniStar, Double or multiple star, Infra-Red source, X-ray sourceK11[x]
70 OphiuchiStar, Double or multiple star, Variable of BY Dra type, Infra-Red source, High proper-motion Star, Dubbelster, UV-emission source, Variable Star, X-ray sourceK16[x]
98 AquariiStar, Infra-Red source, UV-emission sourceK164[x]
AlbireoStar, Double or multiple star, Star in double system, Infra-Red source, Variable StarK435[x]
AldebaranStar, Double or multiple star, Infra-Red source, Long Period Variable, High proper-motion Star, UV-emission source, Variable StarK67[x]
AlgiebaStar, Double or multiple star, Infra-Red sourceK130[x]
Alpha AntliaeStar, Infra-Red source, Variable StarK366[x]
Alpha HorologiiStar, Infra-Red source, High proper-motion Star, UV-emission sourceK115[x]
Alpha IndiStar, Double or multiple star, Infra-Red source, UV-emission sourceK98[x]
Alpha ScutiStar, Infra-Red source, High proper-motion Star, UV-emission source, Variable StarK199[x]
Alpha TucanaeStar, Double or multiple star, Infra-Red source, Dubbelster, UV-emission sourceK200[x]
Alpha VolantisStar, Double or multiple star, Infra-Red source, UV-emission source125[x]
AlphardStar, Double or multiple star, Infra-Red source, High proper-motion Star, UV-emission source, Variable StarK180[x]
AlsciaukatStar, Infra-Red source, Semi-regular pulsating Star, Variable StarK382[x]
AngetenarStar, Double or multiple star, Infra-Red source, UV-emission source, X-ray sourceK187[x]
AnkaaStar, Infra-Red source, High proper-motion Star, Dubbelster, UV-emission sourceK85[x]
ArcturusStar, Infra-Red source, High proper-motion Star, Rode reus, UV-emission source, Variable StarK37[x]
Asellus AustralisStar, Double or multiple star, Infra-Red source, High proper-motion Star, UV-emission sourceK131[x]
AzhaStar, Infra-Red source, High proper-motion Star, UV-emission source, Variable StarK136[x]
BD+75 58Star, Infra-Red sourceK55[x]
BoteinStar, Infra-Red source, High proper-motion Star, UV-emission source, Variable StarK169[x]
CebalraiStar, Infra-Red source, High proper-motion Star, UV-emission source, Variable StarK82[x]
DE BootisStar, Infra-Red source, High proper-motion Star, Variable of RS CVn type, Dubbelster, UV-emission source, Variable Star, X-ray sourceK38[x]
Delta AndromedaeStar, Double or multiple star, Infra-Red source, High proper-motion Star, Dubbelster, UV-emission source, Variable StarK105[x]
Delta AurigaeStar, Double or multiple star, Infra-Red source, High proper-motion Star, Dubbelster, UV-emission sourceK141[x]
Delta MuscaeStar, Infra-Red source, High proper-motion Star, DubbelsterK90[x]
Deneb AlgediStar, Double or multiple star, Eclipsing binary of Algol type (detached), Infra-Red source, High proper-motion Star, Dubbelster, UV-emission source, Variable Star, X-ray source39[x]
DiphdaStar, Infra-Red source, High proper-motion Star, UV-emission source, Variable Star, X-ray sourceK96[x]
EnifStar, Double or multiple star, Infra-Red source, Long-period variable star, Peculiar star, UV-emission source, Variable StarK690[x]
EP EridaniStar, Double or multiple star, Vlamster, Infra-Red source, High proper-motion Star, Rotationally variable Star, Variable of RS CVn type, UV-emission source, Variable Star, X-ray sourceK34[x]
Epsilon CrucisStar, Infra-Red source, High proper-motion Star, Variable StarK230[x]
Epsilon CygniStar, Double or multiple star, Infra-Red source, High proper-motion Star, UV-emission sourceK72[x]
Epsilon EridaniStar, Double or multiple star, Variable of BY Dra type, Infra-Red source, High proper-motion Star, Rotationally variable Star, UV-emission source, Variable Star, X-ray sourceK11[x]
Epsilon IndiStar, Double or multiple star, Infra-Red source, High proper-motion Star, Pre-main sequence Star, UV-emission source, X-ray sourceK12[x]
Epsilon ScorpiiStar, Infra-Red source, High proper-motion Star, UV-emission source, Variable Star, X-ray sourceK64[x]
Eta CepheiStar, Double or multiple star, Infra-Red source, High proper-motion Star, UV-emission sourceK46[x]
Eta SerpentisStar, Double or multiple star, Infra-Red source, High proper-motion Star, UV-emission source, Variable StarK61[x]
EtaminStar, Double or multiple star, Infra-Red source, UV-emission sourceK154[x]
G ScorpiiStar, Double or multiple star, Infra-Red source, UV-emission source, Variable StarK126[x]
Gliese 2084Star, Double or multiple star, Infra-Red source, Peculiar star, High proper-motion Star, Variable of RS CVn type, sub-millimetric source, UV-emission source, Variable Star, X-ray sourceK146[x]
Gliese 868Star, Infra-Red source, High proper-motion StarK44[x]
Gorgonea QuartaStar, Double or multiple star, Infra-Red source, UV-emission sourceK288[x]
Groombridge 1618Star, Double or multiple star, Vlamster, Infra-Red source, High proper-motion Star, Variable Star, X-ray sourceK16[x]
GrumiumStar, Double or multiple star, Infra-Red source, High proper-motion Star, UV-emission sourceK112[x]
HamalStar, Infra-Red source, High proper-motion Star, UV-emission source, Variable StarK66[x]
HIP 98001Star, Double or multiple star, Infra-Red source, High proper-motion Star, DubbelsterK151[x]
Iota CentauriStar, Infra-Red source, High proper-motion Star59[x]
Kappa OphiuchiStar, Infra-Red source, Long Period Variable, High proper-motion Star, UV-emission source, Variable StarK91[x]
Kaus BorealisStar, Double or multiple star, Infra-Red source, UV-emission sourceK78[x]
KX LibraeStar, Double or multiple star, Variable of BY Dra type, Infra-Red source, High proper-motion Star, Variable StarK19[x]
LHS 1875Star, Double or multiple star, Infra-Red source, High proper-motion Star, UV-emission source, X-ray sourceK28[x]
LHS 200Star, Infra-Red source, High proper-motion Star, Rotationally variable Star, Variable StarK29[x]
LHS 71Star, Double or multiple star, Vlamster, Infra-Red source, High proper-motion Star, Variable StarK21[x]
LTT 2151Star, Double or multiple star, Infra-Red source, High proper-motion Star, X-ray sourceK28[x]
MenkentStar, Double or multiple star, Infra-Red source, High proper-motion Star, UV-emission sourceK59[x]
MesarthimStar, Double or multiple star, Variable Star of alpha2 CVn type, Infra-Red source, UV-emission source, Variable Star204[x]
NashiraStar, Variable Star of alpha2 CVn type, Infra-Red source, UV-emission source, Variable Star157[x]
OU GeminorumStar, Double or multiple star, Variable of BY Dra type, Vlamster, Infra-Red source, High proper-motion Star, Dubbelster, UV-emission source, Variable Star, X-ray sourceK47[x]
P EridaniStar, Double or multiple star, Infra-Red source, UV-emission source, X-ray sourceK27[x]
Pi HydraeStar, Infra-Red source, UV-emission sourceK101[x]
Pi PuppisStar, Double or multiple star, Star in Cluster, Infra-Red source, Semi-regular pulsating Star, Variable StarK807[x]
PolluxStar, Double or multiple star, Infra-Red source, High proper-motion Star, UV-emission source, Variable Star, X-ray sourceK34[x]
PraecipuaStar, Infra-Red source, High proper-motion Star, UV-emission source, Variable StarK95[x]
RanaStar, Infra-Red source, High proper-motion Star, Rotationally variable Star, Variable of RS CVn type, UV-emission source, Variable StarK30[x]
SceptrumStar, Double or multiple star, Infra-Red source, UV-emission sourceK110[x]
SchedarStar, Double or multiple star, Infra-Red source, High proper-motion Star, UV-emission source, Variable StarK229[x]
SheratanStar, Double or multiple star, Infra-Red source, Dubbelster, UV-emission source, Variable Star58[x]
Sigma PuppisStar, Double or multiple star, Ellipsoidal variable Star, Infra-Red source, High proper-motion Star, Dubbelster, UV-emission source, Variable StarK184[x]
Tau PuppisStar, Infra-Red source, Dubbelster, UV-emission sourceK182[x]
Tau SagittariiStar, Infra-Red source, High proper-motion Star, Dubbelster, UV-emission sourceK121[x]
UnukalhaiStar, Double or multiple star, Infra-Red source, UV-emission source, Variable Star, X-ray sourceK74[x]
V2689 OrionisStar, Infra-Red source, High proper-motion Star, Variable of RS CVn type, UV-emission source, Variable Star, X-ray sourceK37[x]
V439 AndromedaeStar, Double or multiple star, Variable of BY Dra type, Infra-Red source, High proper-motion Star, UV-emission source, Variable Star, X-ray sourceK45[x]
V538 AurigaeStar, Double or multiple star, Variable of BY Dra type, Vlamster, Infra-Red source, High proper-motion Star, Rotationally variable Star, UV-emission source, Variable Star, X-ray sourceK40[x]
Wolf 25Star, Double or multiple star, Infra-Red source, High proper-motion Star, Rotationally variable Star, UV-emission sourceK24[x]
ZibalStar, Double or multiple star, Infra-Red source, Dubbelster, UV-emission source, Variable Star110[x]
1 AurigaeStar, Infra-Red sourceK504
1 PegasiStar, Double or multiple star, Infra-Red source, Dubbelster, UV-emission sourceK156
105 PisciumStar, Infra-Red sourceK392
109 HerculisStar, Double or multiple star, Infra-Red source, High proper-motion Star, UV-emission source, Variable StarK119
11 CepheiStar, Infra-Red source, High proper-motion Star, UV-emission sourceK182
12 AquariiStar, Double or multiple starK106
12 TauriStar, Infra-Red source, UV-emission sourceK372
12 VirginisStar, Infra-Red source, High proper-motion Star, UV-emission source164
14 HerculisStar, Double or multiple star, Infra-Red source, High proper-motion StarK58
15 EridaniStar, Double or multiple star, Infra-Red source, UV-emission sourceK255
15 GeminorumStar, Double or multiple star, Infra-Red sourceK58
18 LibraeStar, Double or multiple star, Infra-Red sourceK310
2 LibraeStar, Infra-Red sourceK334
20 CepheiStar, Infra-Red source, Variable StarK303
21 EridaniStar, Infra-Red source, High proper-motion Star, UV-emission sourceK110
24 Ursae MinorisStar, Infra-Red source, High proper-motion Star, UV-emission source153
25 ScorpiiStar, Infra-Red sourceK706
2MASS J03285930+3115485Double or multiple star, Infra-Red source, X-ray source, Jong stellair objectK1398
2MASS J04295914+3518482Star, Emission-line Star, Infra-Red source, Near-IR source (? < 10 ?m), Jong stellair objectK2564
2MASS J04295977+3513341Infra-Red source, X-ray source, Jong stellair objectK2570
2MASS J04300985+3514164Star, Emission-line Star, Infra-Red source, Near-IR source (? < 10 ?m), Jong stellair objectK2559