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Gaia BH2 B
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Star Gaia BH2 B

Red giant Gaia BH2 B is located 4853 light years away from the Sun. It is a single star, that has 107 % of solar mass. For now, there are no known exoplanets in this star system.
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Sun distance
4853 light years
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Gaia BH2 B

Red giant

Location +

Distance iconDistance from the primary: 4.96 AU

Basic characteristic

icon weight
Mass: 107 % M Sun
| 1121 M Jupiter
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Star mass
Mass of the star Gaia BH2 B is 1.07 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: 788 % R Sun
| 78.4 R Jupiter
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Star size
Radius of the star Gaia BH2 B is 7.88 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: 4604 K | 0.8 T Sun
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Star temperature
Surface temperature of Gaia BH2 B is 4604 K, which is 80 % 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: 25 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

Absolute stellar magnitude in different parts of the electromagnetic spectrum from infrared (K band) to ultraviolet (U band).
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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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Gaia BH2 B system structure

 Gaia BH2 A
Gaia BH2 B 4.96 AU

More about Gaia BH2 B

Gaia BH2 B is is approximately 8 times bigger than the Sun and temperature on its surface is around 4604 K (4331 °C), which is about 80 % of Sun's temperature.
       Gaia BH2 B can be found in southern celestial hemisphere.
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External sources
icon study
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Scientific study, Accepted: 29. 12. 2026
icon study
A Sample of Thick-Disk Stars Hosting Hot Jupiters
Scientific study, Accepted: 16. 10. 2026
icon study
icon study
icon study
icon study
icon study
icon study
icon study
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
iconToday
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....
Read article tag icon
Atmospheric structure of WASP-94 A b revealed through new limb asymmetry method
iconToday
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....
Read article tag icon
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....
Read article tag icon

Frequently Asked Questions

How far is the Gaia BH2 B system from the Sun?

The Gaia BH2 B system is 4853 light years or 1,487.9 parsecs from the Sun.

What galaxy is the Gaia BH2 B star in?

The Gaia BH2 B is in the Milky Way galaxy just like the Sun.

How many stars are in the Gaia BH2 B system?

The Gaia BH2 B is a single star, there are no other known stars in the system.

What type of star is the Gaia BH2 B?

The star Gaia BH2 B is a Red giant star.

What temperature is star Gaia BH2 B?

The star Gaia BH2 B has an effective temperature of 4604 K. Find out more about the temperature of stars in Stellar guide
Class of stars Red giant
White dwarfs are the hot, extremely dense stellar remnants left behind by stars that originally had masses between about 0.5 and 8 times the mass of the Sun during their main sequence lifetimes. After exhausting their nuclear fuel, these stars shed their outer layers and leave behind a compact core. Although white dwarfs contain between roughly 0.2 and 1.44 solar masses, this mass is packed into a volume comparable to that of an Earth-sized planet, making them some of the densest objects in the Universe.
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