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Gaia BH1
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Star Gaia BH1

Binary system Gaia BH1 consists of a black hole and a yellow Sun-like star. The stellar mass black hole is the closest one to the solar system.
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Sun distance
1561 light years
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Gaia BH1 A

Black hole

Location +

Ascension iconRight ascension: 17h 28m 41.097s
Declination iconDeclination: -0° 34' 51.931'' (equatorial region)
Parallax iconParallax: 2.090
Distance iconSun distance: 1,560.555 ly | 478.5 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: 962 % M Sun
| 10078 M Jupiter
+
Star mass
Mass of the star Gaia BH1 A is 9.62 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

Photometry

Magnitude iconAbsolute magnitude (V): -8.4
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

Gaia BH1 B

Yellow star

Location +

Distance iconDistance from the primary: 1.40 AU

Basic characteristic

icon weight
Mass: 93 % M Sun
| 974 M Jupiter
+
Star mass
Mass of the star Gaia BH1 B is 9.62 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: 99 % R Sun
| 9.9 R Jupiter
+
Star size
Radius of the star Gaia BH1 B is 0.99 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: 5850 K | 1.01 T Sun
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Star temperature
Surface temperature of Gaia BH1 B is 5850 K, which is 101 % 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: 1.06 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 iconAbsolute magnitude (V): -8.4
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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Gaia BH1 system structure

 Gaia BH1 A
Gaia BH1 B 1.40 AU

More about Gaia BH1

       Gaia BH1 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
Gaia DR3 4373465352415301632
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External sources
icon study
A Sun-like star orbiting a boson star
Scientific study, Accepted: 18. 04. 2023
icon study
A Sun-like star orbiting a black hole
Scientific study, 28. 10. 2022

Frequently Asked Questions

How far is the Gaia BH1 system from the Sun?

The Gaia BH1 system is 1561 light years or 478.5 parsecs from the Sun.

What galaxy is the Gaia BH1 star in?

The Gaia BH1 is in the Milky Way galaxy just like the Sun.

How many stars are in the Gaia BH1 system?

The Gaia BH1 system contains 2 stars.

What type of star is the Gaia BH1?

The primary in the Gaia BH1 system is a Black hole star.

What temperature is the Gaia BH1?

The primary in the Gaia BH1 system has an effective temperature of K ( °C). Find out more about the temperature of stars in Stellar guide

stellar brief logoStellar Brief

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6. 11. 2026
stellar brief logo
The spiral arms in the young star IM Lupi’s planet-forming disk appear to stand still, not orbit as earlier reports suggested, and a faint, larger spiral may reach farther out. New findings also link red dwarf chemistry to the makeup of rocky planets, test a faster way to read WASP-77 b’s atmosphere, forecast sharper searches for shrinking hot-Jupiter orbits, and track changing gas around the young binary DQ Tau.
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