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40 Eridani B
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Star 40 Eridani B

White dwarf 40 Eridani B is located 16 light years away from the Sun. It is a single flare star of spectral class DA4, that has 57 % of solar mass. For now, there are no known exoplanets in this star system.
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Sun distance
16 light years
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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
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Star mass
Mass of the star 40 Eridani B 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: 1.4 % R Sun
| 0.1 R Jupiter
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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)
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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
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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 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
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40 Eridani B system structure

 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 B

       40 Eridani B can be found in southern celestial hemisphere, you cannot see it with naked eye, but you can observe this star with basic telescope. The star is also observable from Northern America, Europe and Asia.
Other designations of this star
BD-07° 781, G 160-060, HD 26976, LHS 24, LTT 1908, SAO 131065, omi02 Eri B, Gaia EDR3 3195919254111315712
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External sources
icon study
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Scientific study, Accepted: 29. 12. 2026
icon study
icon study
icon study
icon study
icon study
A Spatial Map of the Atmospheric Limb of a Hot Jupiter
Scientific study, Accepted: 14. 10. 2026
icon study
icon study
icon study
icon study
Peering into the Midplane of the DM Tau Disk using N2H+ and DCO+
Scientific study, Accepted: 13. 10. 2026
gaia icon
Gaia database (Gaia EDR3 3195919254111315712)
Archive from the Gaia mission

News from this star system

Molecular emission in the disk around DM Tauri reveals complex chemical processes
iconYesterday
Image: Molecular emission in the disk around DM Tauri reveals complex chemical processes
Observations of the disk around DM Tauri reveal how N2H+ and DCO+ molecules are distributed. The data show that external UV radiation and cosmic rays influence the chemical makeup of the disk out to 400 astronomical units, impacting how planets may form....
Read article tag icon
Narrow ring of gas found near the young star HD 152384
iconYesterday
Image: Narrow ring of gas found near the young star HD 152384
A narrow ring of gas has been characterized around the young star HD 152384. Located at the dust sublimation radius, the ring likely formed from the collisions of rocky planetesimals, offering a new look at early planetary system evolution....
Read article tag icon
Atmospheric composition of hot Jupiter KELT-2A b reveals chemical history
iconYesterday
Image: Atmospheric composition of hot Jupiter KELT-2A b reveals chemical history
New observations of hot Jupiter KELT-2A b confirm water vapor in its atmosphere. The planet shows a carbon-to-oxygen ratio similar to its host star but with overall lower metallicity, suggesting a complex migration history from far out in its star system....
Read article tag icon

Frequently Asked Questions

How far is the 40 Eridani B system from the Sun?

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

What galaxy is the 40 Eridani B star in?

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

How many stars are in the 40 Eridani B system?

The 40 Eridani B is a single star, there are no other known stars in the system.

What type of star is the 40 Eridani B?

The star 40 Eridani B is a White dwarf star.

What temperature is the 40 Eridani B?

The primary in the 40 Eridani B system has an effective temperature of K ( °C). Find out more about the temperature of stars in Stellar guide
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