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Gliese 229
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Star Gliese 229

Triple star system Gliese 229 is located 19 light years away from the Sun. It is a system with 3 stars. There are multiple known exoplanets in this system.
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Sun distance
19 light years
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Gliese 229 A

Red dwarf, flare star
Spectral class: M1.5 V

Location +

Ascension iconRight ascension: 6h 10m 34.464s
Declination iconDeclination: -21° 52' 4.163'' (southern hemisphere)
Parallax iconParallax: 173.574
Distance iconSun distance: 18.791 ly | 5.8 pc
Star position
The position of a star tells us where it appears in the sky, similar to how we use coordinates like latitude and longitude on Earth. In astronomy, the three main coordinates are right ascension, declination and distance. .. icon More about Star position in StellarGuide

Basic characteristic

icon weight
Mass: 58 % M Sun
| 608 M Jupiter
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Star mass
Mass of the star Gliese 229 A is 0.58 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
radius icon
Size: 69 % R Sun
| 6.9 R Jupiter
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Star size
Radius of the star Gliese 229 A is 0.69 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: 3837 K | 0.66 T Sun
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Star temperature
Surface temperature of Gliese 229 A is 3837 K, which is 66 % 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
luminosity icon
Luminosity: 0.0158 L Sun
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Star luminosity
Luminosity is the total amount of energy a star gives off every second. Think of it as the star’s true brightness — not just how bright it looks from Earth. This is important because some stars may appear dim simply because they are far away, not because they’re actually faint... icon More about Star luminosity in StellarGuide

Photometry

Magnitude iconApparent magnitude (V): 8.1
Magnitude iconAbsolute magnitude (V): 9.3
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

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 0.58 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
radius icon
Size: 4.7 % R Sun
| 0.5 R Jupiter
+
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

Gliese 229 Bb

Brown dwarf, flare star

Basic characteristic

icon weight
Mass: 3.3 % M Sun
| 35 M Jupiter
+
Star mass
Mass of the star Gliese 229 Bb 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
temperature icon
Temperature: 775 K | 0.13 T Sun
+
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 system structure

Stars B and C form a pair, which orbits the primary star A.
 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

       Gliese 229 can be found in southern celestial hemisphere, you cannot see it with naked eye, but you can observe this star with basic telescope. The star is also observable from Northern America, Europe and Asia.
Other designations of this star
HD 42581B, HD 42581, HIP 29295, LHS 1827, NSV 2863, SAO 171334, TYC 5945-765-1, WISE J061034.53-215200.3, GJ 229, Gaia EDR3 2940856402123426176
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External sources
icon study
icon study
The cool brown dwarf Gliese 229 B is a close binary
Scientific study, Accepted: 15. 10. 2024
icon study
Investigating Possible Binarity for GJ 229B
Scientific study, Accepted: 14. 06. 2023

Frequently Asked Questions

How far is the Gliese 229 system from the Sun?

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

What galaxy is the Gliese 229 star in?

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

How many stars are in the Gliese 229 system?

The Gliese 229 system contains 3 stars.

What type of star is the Gliese 229?

The primary in the Gliese 229 system is a Red dwarf star.

What temperature is star Gliese 229?

The primary in the Gliese 229 system has a temperature of 3837 K. Find out more about the temperature of stars in Stellar guide
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