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GW Librae B
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Star GW Librae B

Brown dwarf GW Librae B is located 369 light years away from the Sun. It is a single star, that has 5 % of solar mass. For now, there are no known exoplanets in this star system.
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Sun distance
369 light years
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GW Librae B

Brown dwarf

Location +

Distance iconDistance from the primary: 0.002667 AU

Basic characteristic

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Mass: 5 % M Sun
| 52 M Jupiter
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Star mass
Mass of the star GW Librae B is 0.05 solar masses (or 52.4 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

Photometry

Magnitude iconAbsolute magnitude (V): -5.3
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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GW Librae B system structure

 GW Librae A
GW Librae B 0.002667 AU

More about GW Librae B

       GW Librae 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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News from this star system

Massive brown dwarf HD 203771 b confirmed in eccentric orbit around orange dwarf
iconYesterday
Image: Massive brown dwarf HD 203771 b confirmed in eccentric orbit around orange dwarf
Massive brown dwarf HD 203771 b confirmed in an eccentric orbit around an orange dwarf star. New mass measurements place the companion at approximately 70 times the mass of Jupiter, revealing insights into how brown dwarfs migrate inward over time....
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HD 158485 revealed as a binary system containing two pulsating stars
iconYesterday
Image: HD 158485 revealed as a binary system containing two pulsating stars
HD 158485, a calibration star for the James Webb Space Telescope, is actually a binary system. Observations from TESS show two pulsating stars orbiting each other every 382.8 days, which helps refine absolute-flux measurements for astronomical data....
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Escaping atmosphere of the ultrahot Jupiter KELT-18 b reveals metastable helium
iconYesterday
Image: Escaping atmosphere of the ultrahot Jupiter KELT-18 b reveals metastable helium
Researchers have detected metastable helium escaping from the ultrahot Jupiter KELT-18 b. This confirms the massive gas giant is undergoing active atmospheric photoevaporation. KELT-18 b is now the most massive planet found with this specific helium signature....
Read article tag icon

Frequently Asked Questions

How far is the GW Librae B system from the Sun?

The GW Librae B system is 369 light years or 113.0 parsecs from the Sun.

What galaxy is the GW Librae B star in?

The GW Librae B is in the Milky Way galaxy just like the Sun.

How many stars are in the GW Librae B system?

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

What type of star is the GW Librae B?

The star GW Librae B is a Brown dwarf star.

What temperature is the GW Librae B?

The primary in the GW Librae B system has an effective temperature of K ( °C). 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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exoplanet iconAbout Stellar Catalog

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Working with real data
icon Data in Stellar Catalog come from trusted scientific sources. Primary source is Gaia space telescope mapping the stars in Milky Way. Other sources include research papers, Simbad catalog and Exoplanet.eu database.
Estimated values
icon Objects listed in the Stellar Catalog often have values that are estimates. These estimates are determined using their known characteristics, such as spectral type, brightness across different wavelengths, distance from a star, and other factors.
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icon Stellar Catalog is continuously updated with new information from research papers. Stellar and planetary data are validated by automatic processes as well as humans.
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Stellar Catalog brings the stars from our galaxy to you. Discover their position, physical properties and whether there are any exoplanets or disks orbiting them. The data in Stellar Catalog come from respectable sources like Gaia space telescope, or SIMBAD database.
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