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Gliese 229 Bb
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Star Gliese 229 Bb

Brown dwarf Gliese 229 Bb is located 19 light years away from the Sun. It is a single flare star, that has 3 % 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 Bb

Brown dwarf, flare star

Basic characteristic

icon weight
Mass: 3.3 % M Sun
| 35 M Jupiter
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Star mass
Mass of the star Gliese 229 Bb is 0.033 solar masses (or 34.6 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
temperature icon
Temperature: 775 K | 0.13 T Sun
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Star temperature
Surface temperature of Gliese 229 Bb is 775 K, which is 13 % 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 Bb 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 Bb

and temperature on its surface is around 775 K (502 °C), which is about 13 % of Sun's temperature.
       Gliese 229 Bb 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

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....
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Orbital and atmospheric evolution of the mini-Neptune TOI-2257 b
iconToday
Image: Orbital and atmospheric evolution of the mini-Neptune TOI-2257 b
The exoplanet TOI-2257 b orbits its star once every 35 days with a high eccentricity. New models suggest its atmospheric and orbital fate depends on whether it is a gas-rich mini-Neptune or a rocky super-Earth. Higher eccentricity would confirm a gaseous nature....
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Frequently Asked Questions

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

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

What galaxy is the Gliese 229 Bb star in?

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

How many stars are in the Gliese 229 Bb system?

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

What type of star is the Gliese 229 Bb?

The star Gliese 229 Bb is a Brown dwarf star.

What temperature is star Gliese 229 Bb?

The star Gliese 229 Bb has an effective temperature of 775 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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