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Epsilon Eridani
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Star Epsilon Eridani

Epsilon Eridani is an orange dwarf star located approximately 10.5 light-years from the Sun. As a K2V-type star, it is slightly smaller and cooler than our Sun, with about 82 percent of the solar mass and 73.5 percent of the solar radius. Estimated to be 1.1 billion years old, the system is well-known for hosting a complex architecture of debris disks and at least one gas giant planet, Epsilon Eridani b, making it a primary target for studying planetary system formation and evolution.
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Sun distance
11 light years
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Epsilon Eridani

Orange star, BY Draconis variable
Spectral class: K2 V

Location +

Ascension iconRight ascension: 3h 32m 54.799s
Declination iconDeclination: -9° 27' 29.406'' (equatorial region)
Parallax iconParallax: 310.577
Distance iconSun distance: 10.502 ly | 3.2 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: 82 % M Sun
| 859 M Jupiter
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Star mass
Mass of the star Epsilon Eridani is 0.82 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: 74 % R Sun
| 7.3 R Jupiter
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Star size
Radius of the star Epsilon Eridani is 0.735 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: 5183 K | 0.9 T Sun
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Star temperature
Surface temperature of Epsilon Eridani is 5183 K, which is 90 % 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
time icon
Age: 1.1 billions years | 0.24 Sun
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Star age
Star Epsilon Eridani is 1.1 billion years old, which is about 0.24 of the Sun's age.

The age of a star tells us how long it has been shining since it formed. Knowing a star’s age helps astronomers understand its life stage, how it has changed over time, and what will happen to it in the future... icon More about Star age in StellarGuide
luminosity icon
Luminosity: 0.34 L Sun
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Star luminosity
Luminosity is the total amount of energy a star gives off every second. Think of it as the star’s true brightness — not just how bright it looks from Earth. This is important because some stars may appear dim simply because they are far away, not because they’re actually faint... icon More about Star luminosity in StellarGuide

Photometry

Magnitude iconApparent magnitude (V): 3.7
Magnitude iconAbsolute magnitude (V): 6.2
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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Epsilon Eridani system structure

 Epsilon Eridani
Epsilon Eridani asteroid belt 2 AU 1 R⊕ -
Epsilon Eridani b 3.48 AU 248 M⊕ 2775 days
Epsilon Eridani asteroid belt 14 AU 12 R⊕ -
Epsilon Eridani c
unconfirmed
 40 AU 31.8 M⊕ 102270 days
Epsilon Eridani Main belt 70 AU 10 R⊕ -

More about Epsilon Eridani

Nearby star Epsilon Eridani is a main sequence star that fuses hydrogen atoms into helium. It is approximately 70 % of the size of Sun and temperature on its surface is around 5183 K (4910 °C), which is about 90 % of Sun's temperature.
      a BY Draconis variable. Stars from this category exhibit periodic variations in their luminosity. The variability is caused by a rotation which shows and hides starspots on the surface. Epsilon Eridani can be found in southern celestial hemisphere, and it is possible to see it with naked eye. The star is also observable from Northern America, Europe and Asia. 

      Epsilon Eridani is a BY Draconis variable. Stars from this category exhibit periodic variations in their luminosity. The variability is caused by a rotation which shows and hides starspots on the surface.
Other designations of this star
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, Gaia EDR3 5164707970261890560
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External sources
icon study
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icon study
icon study
icon study
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icon study
SPHERE RefPlanets: Search for epsilon Eridani b and warm dust
Scientific study, Accepted: 30. 04. 2024
icon study
icon study
Debris disks around main-sequence stars
Scientific study, Accepted: 18. 03. 2024
icon study
simbad icon
Simbad database (* eps Eri)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 5164707970261890560)
Archive from the Gaia mission

Frequently Asked Questions

How far is the Epsilon Eridani system from the Sun?

The Epsilon Eridani system is 11 light years or 3.2 parsecs from the Sun.

What galaxy is the Epsilon Eridani star in?

The Epsilon Eridani is in the Milky Way galaxy just like the Sun.

How many stars are in the Epsilon Eridani system?

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

What type of star is the Epsilon Eridani?

The star Epsilon Eridani is a Orange star star.

What temperature is star Epsilon Eridani?

The star Epsilon Eridani has an effective temperature of 5183 K. Find out more about the temperature of stars in Stellar guide
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 0.78 M☉ 5.5 ly

Teegardens star
 0.1 M☉ 5.9 ly

40 Eridani
 0.84 M☉ 6.3 ly

Gliese 1061
 0.11 M☉ 6.9 ly
3D map of stellar neighborhood
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stellar brief logoStellar Brief

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3. 11. 2026
stellar brief logo
TOI-2298 b is about three times Earth’s size and circles its orange dwarf star inside the star’s conservative habitable zone, but uncertain orbits can make such labels misleading. New studies also examine the dust around HD 100546, a possible giant planet around HD 156295, a changing planetary orbit, and how computer models interpret exoplanet atmospheres.
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