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Gliese 3991 B
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Star Gliese 3991 B

White dwarf Gliese 3991 B is located 25 light years away from the Sun. It is a single star of spectral class D12, that has 50 % of solar mass. For now, there are no known exoplanets in this star system.
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Sun distance
25 light years
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Gliese 3991 B

White dwarf
Spectral class: D12

Basic characteristic

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Mass: 50 % M Sun
| 524 M Jupiter
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Star mass
Mass of the star Gliese 3991 B is 0.5 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
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Age: 6 billions years | 1.3 Sun
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Star age
Star Gliese 3991 B is 6 billion years old, which is about 1.3 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
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Gliese 3991 B system structure

 Gliese 3991 A
Gliese 3991 B

More about Gliese 3991 B

       Gliese 3991 B can be found in northern celestial hemisphere.
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External sources
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Scientific study, Accepted: 29. 12. 2026
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A Sample of Thick-Disk Stars Hosting Hot Jupiters
Scientific study, Accepted: 16. 10. 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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News from this star system

WASP-33 b and other hot Jupiters identified as prime targets for structural studies
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Image: WASP-33 b and other hot Jupiters identified as prime targets for structural studies
WASP-33 b, WASP-76 b, and HAT-P-32 b are identified as the best candidates for studying how stellar gravity shapes exoplanet interiors. Measuring their physical deformation will help reveal their deep, internal density structures using JWST and Ariel data....
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Atmospheric structure of WASP-94 A b revealed through new limb asymmetry method
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Image: Atmospheric structure of WASP-94 A b revealed through new limb asymmetry method
A new analysis of WASP-94 A b reveals a 415 K temperature difference between its morning and evening sides. The evening atmosphere shows signs of H2O, CO2, CO, and H2S, while the morning side remains obscured by aerosols....
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Thick-disk stars identified as hosts to ancient hot jupiter planets
iconToday
Image: Thick-disk stars identified as hosts to ancient hot jupiter planets
New analysis of 268 stars identifies several hot Jupiters orbiting ancient stars in the Milky Way's thick disk. These systems, over 8 billion years old, show distinct differences in mass and orbital periods compared to younger thin-disk populations....
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Frequently Asked Questions

How far is the Gliese 3991 B system from the Sun?

The Gliese 3991 B system is 25 light years or 7.6 parsecs from the Sun.

What galaxy is the Gliese 3991 B star in?

The Gliese 3991 B is in the Milky Way galaxy just like the Sun.

How many stars are in the Gliese 3991 B system?

The Gliese 3991 B is a single star, there are no other known stars in the system.

What type of star is the Gliese 3991 B?

The star Gliese 3991 B is a White dwarf star.

What temperature is the Gliese 3991 B?

The primary in the Gliese 3991 B system has an effective temperature of K ( °C). Find out more about the temperature of stars in Stellar guide
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