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Kepler 138
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Star Kepler 138

Red dwarf Kepler 138 is located 219 light years away from the Sun. It is a single star of spectral class M1V C, that has 52 % of solar mass. There are multiple known exoplanets in this system.
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Sun distance
219 light years
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Kepler 138

Red dwarf
Spectral class: M1V C

Location +

Ascension iconRight ascension: 19h 21m 31.573s
Declination iconDeclination: 43° 17' 34.681'' (northern hemisphere)
Parallax iconParallax: 14.902
Distance iconSun distance: 218.869 ly | 67.1 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: 52 % M Sun
| 545 M Jupiter
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Star mass
Mass of the star Kepler 138 is 0.52 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: 44 % R Sun
| 4.4 R Jupiter
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Star size
Radius of the star Kepler 138 is 0.44 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 icon
Temperature: 3841.0 K | 0.66 T Sun
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Star temperature
Surface temperature of Kepler 138 is 3841.0 K, which is 66 % 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

Magnitude iconAbsolute magnitude (V): -4.1
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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Kepler 138 system structure

 Kepler 138
Kepler 138 b 0.08 AU 0.1 M⊕ 0.6 R⊕ 10.3 days
Kepler 138 c 0.09 AU 2.3 M⊕ 1.5 R⊕ 13.8 days
Kepler 138 d 0.13 AU 2.1 M⊕ 1.5 R⊕ 23.1 days
Kepler 138 e 0.18 AU 0.4 M⊕ 38.2 days

More about Kepler 138

Star Kepler 138 is a main sequence star that fuses hydrogen atoms into helium. It is approximately 40 % of the size of Sun and temperature on its surface is around 3841.0 K (3568 °C), which is about 66 % of Sun's temperature.
       Kepler 138 can be found in northern celestial hemisphere.
Other designations of this star
KOI-314, 2MASS J19213157+4317347, KIC 7603200, WISE J192131.55+431734.9
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External sources
icon study
Evidence for the volatile-rich composition of a 1.5-R⊕ planet
Scientific study, Accepted: 14. 12. 2022

Frequently Asked Questions

How far is the Kepler 138 system from the Sun?

The Kepler 138 system is 219 light years or 67.1 parsecs from the Sun.

What galaxy is the Kepler 138 star in?

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

How many stars are in the Kepler 138 system?

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

What type of star is the Kepler 138?

The star Kepler 138 is a Red dwarf star.

What temperature is star Kepler 138?

The star Kepler 138 has an effective temperature of 3841.0 K. Find out more about the temperature of stars in Stellar guide
Class of stars Red dwarf
Red dwarfs are small, cool stars with surface temperatures of about 2,000–3,800 K, much cooler than the Sun. They usually have 8–50% of the Sun’s mass and shine very faintly, sometimes at just a tiny fraction of the Sun’s brightness. Classified mainly as spectral type M, they are the most common stars in the Milky Way, making up roughly 70–75% of its stellar population.

They fuse hydrogen slowly through the proton–proton chain and are fully convective, which allows them to use their fuel very efficiently. As a result, red dwarfs can live for tens of billions to trillions of years—far longer than the Sun. Many exoplanets orbit red dwarfs, including some in close habitable zones, though strong stellar activity can affect planetary environments.
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