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40 Eridani
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Star 40 Eridani

Triple star system 40 Eridani is located 16 light years away from the Sun. It is a system with 3 stars. There is at least one exoplanet in this system.
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Sun distance
16 light years
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40 Eridani A

Orange star, flare star
Spectral class: K0V

Location +

Ascension iconRight ascension: 4h 15m 13.911s
Declination iconDeclination: -7° 40' 5.080'' (equatorial region)
Parallax iconParallax: 199.608
Distance iconSun distance: 16.340 ly | 5.0 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: 84 % M Sun
| 880 M Jupiter
+
Star mass
Mass of the star 40 Eridani A is 0.84 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: 81 % R Sun
| 8.1 R Jupiter
+
Star size
Radius of the star 40 Eridani A is 0.81 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: 5202 K | 0.9 T Sun
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Star temperature
Surface temperature of 40 Eridani A is 5202 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: 6.9 billions years | 1.5 Sun
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Star age
Star 40 Eridani A is 6.9 billion years old, which is about 1.5 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: 0.457 L Sun
+
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): 4.4
Magnitude iconAbsolute magnitude (V): 5.9
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

40 Eridani B

White dwarf, flare star
Spectral class: DA4

Location +

Distance iconDistance from the primary: 400 AU

Basic characteristic

icon weight
Mass: 57.3 % M Sun
| 600 M Jupiter
+
Star mass
Mass of the star 40 Eridani B is 0.84 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: 1.4 % R Sun
| 0.1 R Jupiter
+
Star size
Radius of the star 40 Eridani B is 0.014 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: 12500 K
 (estimate)
+
Star temperature
Surface temperature of 40 Eridani B is estimated to be 12470 K, which is 216 % 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
luminosity icon
Luminosity: 0.13 L Sun
+
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 iconAbsolute magnitude (V): 1.5
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

40 Eridani C

Red dwarf, flare star
Spectral class: M4.5 V

Location +

Distance iconDistance from the primary: 400 AU

Basic characteristic

icon weight
Mass: 20.4 % M Sun
| 213 M Jupiter
+
Star mass
Mass of the star 40 Eridani C is 0.573 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: 31 % R Sun
| 3.1 R Jupiter
+
Star size
Radius of the star 40 Eridani C is 0.31 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: 3167 K | 0.55 T Sun
+
Star temperature
Surface temperature of 40 Eridani C is 3167 K, which is 55 % 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: 5.6 billions years | 1.22 Sun
+
Star age
Star 40 Eridani C is 5.6 billion years old, which is about 1.22 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: 0.008 L Sun
+
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): 11.2
Magnitude iconAbsolute magnitude (V): 12.7
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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40 Eridani system structure

Stars B and C form a pair, which orbits the primary star A.
 40 Eridani A
40 Eridani A b
unconfirmed
 0.22 AU 8.5 M⊕ 42 days
40 Eridani B 400 AU
40 Eridani C 400 AU

More about 40 Eridani

       40 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.
Other designations of this star
DY Eri, BD-07°781 C, LHS 25, LTT 1909, omi02 Eri C, BD-07° 781, G 160-060, HD 26976, LHS 24, LTT 1908, SAO 131065, omi02 Eri B, Keid, Omicron² Eridani, 40 Eri, Gliese 166, HD 26965, HIP 19849, HR 1325, LHS 23, LTT 1907, SAO 131063, BD-07° 780, omi02 Eri, Gaia EDR3 3195919528989223040
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External sources
icon study
icon study
icon study
simbad icon
Simbad database (* omi02 Eri C)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 3195919254111314816)
Archive from the Gaia mission

Frequently Asked Questions

How far is the 40 Eridani system from the Sun?

The 40 Eridani system is 16 light years or 5.0 parsecs from the Sun.

What galaxy is the 40 Eridani star in?

The 40 Eridani is in the Milky Way galaxy just like the Sun.

How many stars are in the 40 Eridani system?

The 40 Eridani system contains 3 stars.

What type of star is the 40 Eridani?

The primary in the 40 Eridani system is a Orange star star.

What temperature is star 40 Eridani?

The primary in the 40 Eridani system has a temperature of 5202 K. Find out more about the temperature of stars in Stellar guide
Closest stars

 2MASS 0415-0935
 0.04 M☉ 2.4 ly

Gliese 3323
 0.16 M☉ 3.6 ly

Gliese 205
 0.56 M☉ 6.3 ly

Epsilon Eridani
 0.82 M☉ 6.3 ly

2MASS J0254+0223
 0.06 M☉ 6.8 ly
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