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Wolf 940 B
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Star Wolf 940 B

Brown dwarf Wolf 940 B is located 41 light years away from the Sun. It is a single star of spectral class T8+/Y?, that has 3 % of solar mass. For now, there are no known exoplanets in this star system.
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Sun distance
41 light years
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Wolf 940 B

Brown dwarf
Spectral class: T8+/Y?

Location +

Distance iconDistance from the primary: 400 AU

Basic characteristic

icon weight
Mass: 2.5 % M Sun
| 26 M Jupiter
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Star mass
Mass of the star Wolf 940 B is 0.025 solar masses (or 26.2 Jupiter 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: 9 % R Sun
| 0.9 R Jupiter
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Star size
Radius of the star Wolf 940 B is 0.09 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: 605 K | 0.1 T Sun
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Star temperature
Surface temperature of Wolf 940 B is 605 K, which is 10 % 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

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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Wolf 940 B system structure

 Wolf 940 A
Wolf 940 B 400 AU

More about Wolf 940 B

Wolf 940 B is is is much smaller than the Sun and temperature on its surface is around 605 K (332 °C), which is about 10 % of Sun's temperature.
       Wolf 940 B can be found in southern celestial hemisphere, however it is too dim to be seen with the naked eye or even a small telescope.
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External sources
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Scientific study, Accepted: 29. 12. 2026
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A Spatial Map of the Atmospheric Limb of a Hot Jupiter
Scientific study, Accepted: 14. 10. 2026
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simbad icon
Simbad database (Wolf 940 B)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)

News from this star system

Narrow ring of gas found near the young star HD 152384
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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....
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Atmospheric composition of hot Jupiter KELT-2A b reveals chemical history
iconToday
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....
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Periodic transit timing variations measured for Neptune-like planet HAT-P-18 b
iconToday
Image: Periodic transit timing variations measured for Neptune-like planet HAT-P-18 b
New observations from the James Webb Space Telescope show periodic transit timing variations in the Neptune-like planet HAT-P-18 b. The data indicates an orbital timing shift of 92.9 seconds, providing fresh insights into the dynamics of this distant system....
Read article tag icon

Frequently Asked Questions

How far is the Wolf 940 B system from the Sun?

The Wolf 940 B system is 41 light years or 12.5 parsecs from the Sun.

What galaxy is the Wolf 940 B star in?

The Wolf 940 B is in the Milky Way galaxy just like the Sun.

How many stars are in the Wolf 940 B system?

The Wolf 940 B is a single star, there are no other known stars in the system.

What type of star is the Wolf 940 B?

The star Wolf 940 B is a Brown dwarf star.

What temperature is star Wolf 940 B?

The star Wolf 940 B has an effective temperature of 605 K. Find out more about the temperature of stars in Stellar guide
Class of stars Brown dwarf
Brown dwarfs are not really stars, because there is no thermonuclear fusion in their core. These objects are smaller and cooler than stars, but too massive to be considered planets
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