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Gliese 577
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Star Gliese 577

Binary star Gliese 577 is located 150 light years away from the Sun. It consists of a yellow star and a red dwarf. There is at least one exoplanet in this system.
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Sun distance
150 light years
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Gliese 577 A

Yellow star
Spectral class: G5V

Location +

Ascension iconRight ascension: 15h 5m 50.000s
Declination iconDeclination: 64° 2' 50.000'' (northern hemisphere)
Parallax iconParallax: 21.780
Distance iconSun distance: 149.750 ly | 45.9 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: 99 % M Sun
| 1037 M Jupiter
+
Star mass
Mass of the star Gliese 577 A is 0.99 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: 94 % R Sun
| 9.4 R Jupiter
+
Star size
Radius of the star Gliese 577 A is 0.94 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: 5752 K | 1 T Sun
+
Star temperature
Surface temperature of Gliese 577 A is 5752 K, which is 100 % 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 iconApparent magnitude (V): 8.4
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

Gliese 577 B

Red dwarf
Spectral class: M4.5V

Basic characteristic

icon weight
Mass: 20 % M Sun
| 199 M Jupiter
 (estimate)
+
Star mass
The mass of the star Gliese 577 B is unknown. Based on its other characteristics, it is estimated to be about 20 % of the Sun's mass.

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: 20 % R Sun
| 2.4 R Jupiter
(estimate)
+
Star size
Radius of the star Gliese 577 B is not known. Its estimated value based on other similar stars is about 20 % 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 iconTemperature: 3200 K
 (estimate)
+
Star temperature
Surface temperature of Gliese 577 B is estimated to be 3221 K, which is 55 % 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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Gliese 577 system structure

 Gliese 577 A
Gliese 577 A b 0.02 AU 2.2 M⊕ 1.3 R⊕ 1.1 days
Gliese 577 B

More about Gliese 577

       Gliese 577 can be found in northern celestial hemisphere, you cannot see it with naked eye, but you can observe this star with basic telescope. The star is easily observable from Northern America, Europe and Asia.
Other designations of this star
GJ 577A, HIP 73869, HD 134319, TYC-4183-491-1, BD+64 1046, TOI 1860
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External sources
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Frequently Asked Questions

How far is the Gliese 577 system from the Sun?

The Gliese 577 system is 150 light years or 45.9 parsecs from the Sun.

What galaxy is the Gliese 577 star in?

The Gliese 577 is in the Milky Way galaxy just like the Sun.

How many stars are in the Gliese 577 system?

The Gliese 577 system contains 2 stars.

What type of star is the Gliese 577?

The primary in the Gliese 577 system is a Yellow star star.

What temperature is star Gliese 577?

The primary in the Gliese 577 system has a temperature of 5752 K. Find out more about the temperature of stars in Stellar guide
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