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WASP-81
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Star WASP-81

Binary star WASP-81 is located 1313 light years away from the Sun. It consists of a yellow star and a brown dwarf. There is at least one exoplanet in this system.
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Sun distance
1313 light years
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WASP-81 A

Yellow star
Spectral class: G1

Location +

Ascension iconRight ascension: 20h 16m 49.927s
Declination iconDeclination: 3° 17' 38.209'' (equatorial region)
Parallax iconParallax: 2.484
Distance iconSun distance: 1,312.904 ly | 402.5 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: 108 % M Sun
| 1131 M Jupiter
+
Star mass
Mass of the star WASP-81 A is 1.08 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: 128 % R Sun
| 12.8 R Jupiter
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Star size
Radius of the star WASP-81 A is 1.283 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: 5974 K | 1.03 T Sun
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Star temperature
Surface temperature of WASP-81 A is 5974 K, which is 103 % 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

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

WASP-81 B

Brown dwarf

Basic characteristic

icon weight
Mass: 5.4 % M Sun
| 57 M Jupiter
+
Star mass
Mass of the star WASP-81 B is 1.08 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
temperature iconTemperature: 5900 K
 (estimate)
+
Star temperature
Surface temperature of WASP-81 B is estimated to be 5936 K, which is 102 % 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

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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WASP-81 system structure

 WASP-81 A
WASP-81 A b 0.04 AU 231.8 M⊕ 16 R⊕ 2.7 days
WASP-81 B

More about WASP-81

       WASP-81 can be found in northern celestial hemisphere, however it is too dim to be seen with the naked eye or even a small telescope.
Other designations of this star
TOI-5802, TIC 399402994, Gaia DR3 4244243354278985472
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External sources
icon study
A Sample of Thick-Disk Stars Hosting Hot Jupiters
Scientific study, Accepted: 15. 10. 2026

Frequently Asked Questions

How far is the WASP-81 system from the Sun?

The WASP-81 system is 1313 light years or 402.5 parsecs from the Sun.

What galaxy is the WASP-81 star in?

The WASP-81 is in the Milky Way galaxy just like the Sun.

How many stars are in the WASP-81 system?

The WASP-81 system contains 2 stars.

What type of star is the WASP-81?

The primary in the WASP-81 system is a Yellow star star.

What temperature is star WASP-81?

The primary in the WASP-81 system has a temperature of 5974 K. Find out more about the temperature of stars in Stellar guide
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