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Gliese 229 Ba
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Star Gliese 229 Ba

Brown dwarf Gliese 229 Ba is located 19 light years away from the Sun. It is a single flare star of spectral class T6.5 V, that has 4 % of solar mass. For now, there are no known exoplanets in this star system.
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Sun distance
19 light years
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Gliese 229 Ba

Brown dwarf, flare star
Spectral class: T6.5 V

Basic characteristic

icon weight
Mass: 3.6 % M Sun
| 38 M Jupiter
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Star mass
Mass of the star Gliese 229 Ba is 0.036 solar masses (or 37.7 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: 4.7 % R Sun
| 0.5 R Jupiter
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Star size
Radius of the star Gliese 229 Ba is 0.047 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: 900 K | 0.16 T Sun
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Star temperature
Surface temperature of Gliese 229 Ba is 900 K, which is 16 % 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

Magnitude iconAbsolute magnitude (V): 1.2
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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Gliese 229 Ba system structure

 Gliese 229 A
Gliese 229 A c 0.34 AU 7.9 M⊕ 122 days
Gliese 229 A b 0.9 AU 10.2 M⊕ -
Gliese 229 Ba
Gliese 229 Bb

More about Gliese 229 Ba

Gliese 229 Ba is is is much smaller than the Sun and temperature on its surface is around 900 K (627 °C), which is about 16 % of Sun's temperature.
       Gliese 229 Ba can be found in southern celestial hemisphere, however it is too dim to be seen with the naked eye or even a small telescope.
Other designations of this star
HD 42581B
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External sources
icon study
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Scientific study, Accepted: 29. 12. 2026
icon study
A Headwind-like Helium Outflow from TOI-3884b
Scientific study, Accepted: 23. 10. 2026
icon study
icon study
icon study
icon study
icon study
icon study
icon study
Predictions for an unseen third planet in the WISPIT 2 system
Scientific study, Accepted: 21. 10. 2026
icon study
simbad icon
Simbad database (HD 42581B)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)

News from this star system

Tilted rotation axes in weakly magnetized neutron stars change X-ray polarization signals
iconYesterday
Image: Tilted rotation axes in weakly magnetized neutron stars change X-ray polarization signals
A new model reveals that the tilt of a neutron star's rotation axis significantly alters its X-ray polarization. This insight helps explain data from the IXPE telescope, proving that the orientation of these objects is key to understanding their light....
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Evolutionary stages of blue supergiant star HD 74371 revealed by light patterns
iconYesterday
Image: Evolutionary stages of blue supergiant star HD 74371 revealed by light patterns
Analysis of light patterns from the blue supergiant HD 74371 reveals it is currently evolving blue-ward after a previous red supergiant phase. This study uses asteroseismology to better understand the life cycles of massive stars....
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Infrared observations of WASP 121 reveal stellar oscillations and surface granulation
icon23. 10. 2026
Image: Infrared observations of WASP 121 reveal stellar oscillations and surface granulation
Infrared observations from the James Webb Space Telescope have revealed stellar oscillations and granulation on WASP 121. This first-of-its-kind detection in infrared light refines our understanding of stellar convection and improves future exoplanet modeling....
Read article tag icon

Frequently Asked Questions

How far is the Gliese 229 Ba system from the Sun?

The Gliese 229 Ba system is 19 light years or 5.8 parsecs from the Sun.

What galaxy is the Gliese 229 Ba star in?

The Gliese 229 Ba is in the Milky Way galaxy just like the Sun.

How many stars are in the Gliese 229 Ba system?

The Gliese 229 Ba is a single star, there are no other known stars in the system.

What type of star is the Gliese 229 Ba?

The star Gliese 229 Ba is a Brown dwarf star.

What temperature is star Gliese 229 Ba?

The star Gliese 229 Ba has an effective temperature of 900 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

stellar brief logoStellar Brief

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24. 10. 2026
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A planet’s helium atmosphere streams ahead of its orbit, while infrared observations reveal the hidden rhythms of its star. New work also shows how neutron-star tilt can reshape X-ray light, traces the past of massive blue supergiants, and maps cloudy and clear zones on the hot Jupiter WASP-43 b.
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