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WASP-77
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Star WASP-77

Binary star WASP-77 is located 344 light years away from the Sun. It consists of a yellow star and a orange star. There is at least one exoplanet in this system.
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Nearby stars catalogue
Sun distance
344 light years
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WASP-77 A

Yellow star
Spectral class: G8 D

Location +

Ascension iconRight ascension: 2h 28m 37.234s
Declination iconDeclination: -7° 3' 38.379'' (equatorial region)
Parallax iconParallax: 9.482
Distance iconSun distance: 343.981 ly | 105.5 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: 100.2 % M Sun
| 1050 M Jupiter
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Star mass
Mass of the star WASP-77 A is 1.002 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: 96 % R Sun
| 9.5 R Jupiter
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Star size
Radius of the star WASP-77 A is 0.955 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: 5500 K | 0.95 T Sun
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Star temperature
Surface temperature of WASP-77 A is 5500 K, which is 95 % 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
time icon
Age: 5 billions years | 1.09 Sun
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Star age
Star WASP-77 A is 5 billion years old, which is about 1.09 of the Sun's age.

The age of a star tells us how long it has been shining since it formed. Knowing a star’s age helps astronomers understand its life stage, how it has changed over time, and what will happen to it in the future... icon More about Star age in StellarGuide
luminosity icon
Luminosity: 0.743 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): 10.3
Magnitude iconAbsolute magnitude (V): 5.2
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

WASP-77 B

Orange star
Spectral class: K5 D

Basic characteristic

icon weight
Mass: 71 % M Sun
| 744 M Jupiter
+
Star mass
Mass of the star WASP-77 B is 1.002 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
+
Star size
Radius of the star WASP-77 B 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: 5570 K | 0.96 T Sun
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Star temperature
Surface temperature of WASP-77 B is 5570 K, which is 96 % 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
time icon
Age: 9 billions years | 1.96 Sun
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Star age
Star WASP-77 B is 9 billion years old, which is about 1.96 of the Sun's age.

The age of a star tells us how long it has been shining since it formed. Knowing a star’s age helps astronomers understand its life stage, how it has changed over time, and what will happen to it in the future... icon More about Star age in StellarGuide

Photometry

Magnitude iconAbsolute magnitude (V): -5.1
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-77 system structure

 WASP-77 A
WASP-77 A b 0.02 AU 559.5 M⊕ 13.6 R⊕ 1.4 days
WASP-77 B

More about WASP-77

       WASP-77 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
TIC 632613066, BD-07 436B, SDSS J022837.37-070341.4, BD-07 436A, A 447A, SDSS J022837.27-070338.3, TOI-398, TYC 4697-201-1, WDS J02286-0704A, 2MASS J02283722-0703384
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External sources
icon study
An Analysis of Spitzer Phase Curves for WASP-121b and WASP-77Ab
Scientific study, Accepted: 16. 03. 2025
icon study
icon study
icon study
icon study
icon study
Stellar obliquity measurements of six gas giants
Scientific study, Accepted: 22. 03. 2024
icon study
icon study
Retrieving planet formation parameters of WASP-77Ab using SimAb
Scientific study, Accepted: 27. 11. 2023
icon study

Frequently Asked Questions

How far is the WASP-77 system from the Sun?

The WASP-77 system is 344 light years or 105.5 parsecs from the Sun.

What galaxy is the WASP-77 star in?

The WASP-77 is in the Milky Way galaxy just like the Sun.

How many stars are in the WASP-77 system?

The WASP-77 system contains 2 stars.

What type of star is the WASP-77?

The primary in the WASP-77 system is a Yellow star star.

What temperature is star WASP-77?

The primary in the WASP-77 system has a temperature of 5500 K. Find out more about the temperature of stars in Stellar guide
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