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K2-21
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Star K2-21

Orange star K2-21 is located 273 light years away from the Sun. It is a single star of spectral class K7, that has typically about 70 % of solar mass. There are multiple known exoplanets in this system.
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Sun distance
273 light years
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K2-21

Orange star
Spectral class: K7

Location +

Ascension iconRight ascension: 22h 41m 12.911s
Declination iconDeclination: -14° 29' 21.612'' (equatorial region)
Parallax iconParallax: 11.966
Distance iconSun distance: 272.564 ly | 83.6 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: 70 % M Sun
| 712.3 M Jupiter
 (estimate)
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Star mass
The mass of the star K2-21 is unknown. Based on its other characteristics, it is estimated to be about 70 % of the Sun's mass.

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: 58 % R Sun
| 5.7 R Jupiter
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Star size
Radius of the star K2-21 is 0.5762 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: 4243 K | 0.73 T Sun
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Star temperature
Surface temperature of K2-21 is 4243 K, which is 73 % 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): -4.6
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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K2-21 system structure

 K2-21
K2-21 b 0.07 AU 1.6 M⊕ 1.9 R⊕ 9.3 days
K2-21 c 0.1 AU 3.9 M⊕ 2.3 R⊕ 15.5 days

More about K2-21

Star K2-21 is approximately 60 % of the size of Sun and temperature on its surface is around 4243 K (3970 °C), which is about 73 % of Sun's temperature.
       K2-21 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
EPIC 206011691, Gaia DR3 2596888100773300224
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External sources
icon study
gaia icon
Gaia database (Gaia DR3 2596888100773300224)
Archive from the Gaia mission

Frequently Asked Questions

How far is the K2-21 system from the Sun?

The K2-21 system is 273 light years or 83.6 parsecs from the Sun.

What galaxy is the K2-21 star in?

The K2-21 is in the Milky Way galaxy just like the Sun.

How many stars are in the K2-21 system?

The K2-21 is a single star, there are no other known stars in the system.

What type of star is the K2-21?

The star K2-21 is a Orange star star.

What temperature is star K2-21?

The star K2-21 has an effective temperature of 4243 K. Find out more about the temperature of stars in Stellar guide
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exoplanet iconAbout Stellar Catalog

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Working with real data
icon Data in Stellar Catalog come from trusted scientific sources. Primary source is Gaia space telescope mapping the stars in Milky Way. Other sources include research papers, Simbad catalog and Exoplanet.eu database.
Estimated values
icon Objects listed in the Stellar Catalog often have values that are estimates. These estimates are determined using their known characteristics, such as spectral type, brightness across different wavelengths, distance from a star, and other factors.
Fresh and validated
icon Stellar Catalog is continuously updated with new information from research papers. Stellar and planetary data are validated by automatic processes as well as humans.
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