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K2 138
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Star K2 138

Orange star K2 138 is located 660 light years away from the Sun. It is a single star, that has 93 % of solar mass. There are multiple known exoplanets in this system.
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Sun distance
660 light years
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K2 138

Orange star

Location +

Ascension iconRight ascension: 23h 15m 47.775s
Declination iconDeclination: -10° 50' 59.066'' (equatorial region)
Parallax iconParallax: 4.944
Distance iconSun distance: 659.739 ly | 202.3 pc
Star position
The position of a star tells us where it appears in the sky, similar to how we use coordinates like latitude and longitude on Earth. In astronomy, the three main coordinates are right ascension, declination and distance. .. icon More about Star position in StellarGuide

Basic characteristic

icon weight
Mass: 93 % M Sun
| 974 M Jupiter
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Star mass
Mass of the star K2 138 is 0.93 solar masses.

The mass of a star is the total amount of matter it contains. It is one of the most important properties of a star, as it determines almost everything about how the star lives, changes, and dies. In astronomy, star mass is usually measured in solar masses (M☉) — where 1 solar mass is equal to the mass of our Sun... icon More about Star mass in StellarGuide
radius icon
Size: 86 % R Sun
| 8.6 R Jupiter
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Star size
Radius of the star K2 138 is 0.86 solar radii.

The size of a star refers to its radius — the distance from its center to its surface. Star size is usually measured in solar radii (R☉), where 1 solar radius equals approximately 696,000 kilometers. Depending on their type and life stage, stars can be much smaller or larger than the Sun... icon More about Star size in StellarGuide
temperature iconTemperature: 5300 K
 (estimate)
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Star temperature
Surface temperature of K2 138 is estimated to be 5257 K, which is 92 % of the temperature on the surface of the Sun.

The temperature of a star refers to the temperature at its surface, also called the photosphere. It is measured in kelvins (K), the standard unit for temperature in astronomy. A star’s temperature tells us a lot about its physical properties and where it stands in its evolutionary stage... icon More about Star temperature in StellarGuide

Photometry

Absolute stellar magnitude in different parts of the electromagnetic spectrum from infrared (K band) to ultraviolet (U band).
5
10
15
20
25
30
35
K
2.1
H
1.6
J
1.2
Grp
0.8
I
0.8
G
0.6
V
0.5
Gbp
0.5
B
0.4
U
0.3
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K2 138 system structure

 K2 138
K2 138 b 0.03 AU 3.1 M⊕ 1.5 R⊕ 2.4 days
K2 138 c 0.04 AU 6.3 M⊕ 2.3 R⊕ 3.6 days
K2 138 d 0.06 AU 7.9 M⊕ 2.4 R⊕ 5.4 days
K2 138 e 0.08 AU 13 M⊕ 3.4 R⊕ 8.3 days
K2 138 f 0.1 AU 8.7 M⊕ 2.9 R⊕ 12.8 days
K2 138 g 0.23 AU 25.5 M⊕ 3 R⊕ 42 days

More about K2 138

       K2 138 can be found in southern celestial hemisphere, however it is too dim to be seen with the naked eye or even a small telescope.
Other designations of this star
Gaia DR3 2413596935442139520
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External sources
icon study
icon study
A Six-Planet Resonance Chain in K2-138?
Scientific study, Accepted: 18. 08. 2023
gaia icon
Gaia database (Gaia DR3 2413596935442139520)
Archive from the Gaia mission

Frequently Asked Questions

How far is the K2 138 system from the Sun?

The K2 138 system is 660 light years or 202.3 parsecs from the Sun.

What galaxy is the K2 138 star in?

The K2 138 is in the Milky Way galaxy just like the Sun.

How many stars are in the K2 138 system?

The K2 138 is a single star, there are no other known stars in the system.

What type of star is the K2 138?

The star K2 138 is a Orange star star.

What temperature is the K2 138?

The primary in the K2 138 system has an effective temperature of K ( °C). Find out more about the temperature of stars in Stellar guide

stellar brief logoStellar Brief

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24. 10. 2026
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A planet’s helium atmosphere streams ahead of its orbit, while infrared observations reveal the hidden rhythms of its star. New work also shows how neutron-star tilt can reshape X-ray light, traces the past of massive blue supergiants, and maps cloudy and clear zones on the hot Jupiter WASP-43 b.
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