Oranžový trpaslík

Hvězdy typu K představují střední váhu galaxie, přesně mezi malými červenými trpaslíky a hvězdami jako naše Slunce. Mají hmotnost mezi 60 % a 90 % Slunce a své palivo spalují pomalu a stabilně. Pokud by Slunce bylo táborákem, který dohoří za 10 miliard let, oranžový trpaslík je pomalu žhnoucí poleno svítící až 70 miliard let. Protože vyzařují méně škodlivé radiace než červení trpaslíci a žijí déle než žlutá slunce, jsou jejich planetární systémy považovány za ideální místa pro hledání mimozemského života.

Percentage of Oranžový trpaslík within 98.5 světelné roky: 10.82 % (1030 from 9520 stars)
Average hmotnost of Oranžový trpaslík: 50-80% solar mass
Average radius of Oranžový trpaslík: 60-90% solar radius
Average teplota of Oranžový trpaslík: 3900-5200 K

	Hmotnost	Vzdálenost
Alpha Centauri B Toliman, α2 Centauri, HR 5460, HD 128621, LHS 51, HIP 71681, alf Cen B	K1V	0.91 M☉	4.3 ly
Epsilon Eridani Ran, Gliese 144, 18 Eridani, BD -09°697, GCTP 742.00, HD 22049, HIP 16537, HR 1084, LHS 1557, SAO 130564, WDS 03330-0928, eps Eri	K2 V	0.82 M☉	10.5 ly
61 Cygni B HD 201092, HIP 104217, HR 8086, BD+38°4344, LHS 63	K7 V	0.63 M☉	11.4 ly
61 Cygni Gliese 820 A/B, Struve 2758, ADS 14636, V1803 Cygni, GCTP 5077.00, V1803 Cygni, HD 201091, HIP 104214, HR 8085, BD+38°4343, LHS 62, SAO 7091, 61 Cyg	K5 V	0.7 M☉	11.4 ly
Epsilon Indi Gliese 845, GJ 845, CD−57°8464, CP(D)−57°10015, GCTP 5314.00, HD 209100, HIP 108870, HR 8387, LHS 67, SAO 247287, FK5 825, UGP 544, eps Ind, ε Ind	K5 V	0.78 M☉	11.9 ly

Název hvězdy

Hmotnost

Vzdálenost

Alpha Centauri B

Toliman, α2 Centauri, HR 5460, HD 128621, LHS 51, HIP 71681, alf Cen B

K1V

0.91 M☉

4.3 ly

Epsilon Eridani

Ran, Gliese 144, 18 Eridani, BD -09°697, GCTP 742.00, HD 22049, HIP 16537, HR 1084, LHS 1557, SAO 130564, WDS 03330-0928, eps Eri

K2 V

0.82 M☉

10.5 ly

61 Cygni B

HD 201092, HIP 104217, HR 8086, BD+38°4344, LHS 63

K7 V

0.63 M☉

11.4 ly

61 Cygni

Gliese 820 A/B, Struve 2758, ADS 14636, V1803 Cygni, GCTP 5077.00, V1803 Cygni, HD 201091, HIP 104214, HR 8085, BD+38°4343, LHS 62, SAO 7091, 61 Cyg

K5 V

0.7 M☉

11.4 ly

Epsilon Indi

Gliese 845, GJ 845, CD−57°8464, CP(D)−57°10015, GCTP 5314.00, HD 209100, HIP 108870, HR 8387, LHS 67, SAO 247287, FK5 825, UGP 544, eps Ind, ε Ind

K5 V

0.78 M☉

11.9 ly

Latest news from Oranžový trpaslík

Massive brown dwarf HD 203771 b confirmed in eccentric orbit around orange dwarf

14. 10. 2026

Hvězdy | Exoplanety | Oranžový trpaslík | Hnědí trpaslíci

Image: Massive brown dwarf HD 203771 b confirmed in eccentric orbit around orange dwarf

The massive brown dwarf known as HD 203771 b has been characterized as orbiting its host orange dwarf star once every 1140 days. Brown dwarfs are often called failed stars because they are more massive than planets but not heavy enough to sustain the nuclear fusion that powers stars. This particular companion follows an eccentric, or elongated, path that is inclined at an angle of approximately 130 degrees relative to its host. The host star itself has a mass estimated at 0.79 times that of the ...

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Revised properties of orange dwarf HD 219134 provide new insights into planetary evolution

12. 10. 2026

Hvězdy | Exoplanety | Oranžový trpaslík

Image: Revised properties of orange dwarf HD 219134 provide new insights into planetary evolution

New measurements for the orange dwarf HD 219134 refine its age to 8.92 billion years. Asteroseismic analysis settles past debates on its radius and reveals how the star's radiation history influenced the atmospheres of its companion planets....

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Masses and atmospheric evolution of planets in the young K2-233 system

9. 10. 2026

Hvězdy | Exoplanety | Oranžový trpaslík | Superzemě | Atmosféry plane

Image: Masses and atmospheric evolution of planets in the young K2-233 system

New study characterizes the three-planet system K2-233. The 400 million year old orange dwarf hosts inner iron-rich planets and an outer planet, K2-233 d, that is actively losing its atmosphere. Over time, K2-233 d will likely become a sub-Neptune or super-Earth....

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Low density super earth TOI-2211 b characterized as a potential hot water world

9. 10. 2026

Image: Low density super earth TOI-2211 b characterized as a potential hot water world

TOI-2211 b is identified as a potential hot water world. Observations of this super-Earth, which orbits its orange dwarf star every 3.09 days, reveal a mass of 2.69 Earth masses and a radius of 1.457 Earth radii. A second planetary candidate was also detected....

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Oxygen signatures in the rock vapor outflow of planet BD+05 4868 b

6. 10. 2026

Hvězdy | Exoplanety | Oranžový trpaslík

Image: Oxygen signatures in the rock vapor outflow of planet BD+05 4868 b

Observations of the disintegrating planet BD+05 4868 b suggest the presence of an escaping rock-vapor outflow. The detected oxygen signatures provide a unique look at how intense radiation strips material from the surfaces of rocky exoplanets....

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Projděte si nejnovější vědecké studie o hvězdách a exoplanetách v naší galaxii. Objevte nejnovější výzkumy astrofyziky a hvězdné astronomie.

Aktuální výzkum

	HD 203771 184 ly			An Intermediate-orbit Brown Dwarf Confirmed with Astrometry+Radial Velocity Joint Analysis, and the Eccentricity Distribution of Brown Dwarfs Across Different Locations 14. 10. 2026
	Gliese 892 21.3 ly			Detailed study of HD 219134: a benchmark K-dwarf with a compact planetary system 12. 10. 2026
	K2 233 221 ly			The GAPS Programme at TNG. LXXX. Characterisation of the 400 Myr old multi-planet system K2-233 9. 10. 2026
	TOI-2211 230 ly			Searching for hot water world candidates with CHEOPS: II. A low-density super-Earth orbiting the K dwarf TOI-2211 9. 10. 2026
	BD+05 4868 142 ly			Candidate O I 7774 Å Absorption from an Escaping Rock-Vapor Outflow of BD+05 4868 Ab 6. 10. 2026

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