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Gliese 777
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Star Gliese 777

Binary star Gliese 777 is located 52 light years away from the Sun. It consists of a yellow star and a red dwarf. There are multiple known exoplanets in this system.
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Sun distance
52 light years
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Gliese 777 A

Yellow star, High proper motion star
Spectral class: G7IV-V C

Location +

Ascension iconRight ascension: 20h 3m 38.252s
Declination iconDeclination: 29° 53' 40.085'' (northern hemisphere)
Parallax iconParallax: 62.487
Distance iconSun distance: 52.196 ly | 16.0 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: 82 % M Sun
| 859 M Jupiter
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Star mass
Mass of the star Gliese 777 A is 0.82 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: 106 % R Sun
| 10.6 R Jupiter
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Star size
Radius of the star Gliese 777 A is 1.061 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: 5672 K | 0.98 T Sun
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Star temperature
Surface temperature of Gliese 777 A is 5672 K, which is 98 % 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: 6.7 billions years | 1.46 Sun
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Star age
Star Gliese 777 A is 6.7 billion years old, which is about 1.46 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: 1.127 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).
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 777 B

Red dwarf, High proper motion star
Spectral class: M4.5V

Location +

Distance iconDistance from the primary: 3000 AU

Basic characteristic

icon weight
Mass: 20 % M Sun
| 199 M Jupiter
 (estimate)
+
Star mass
The mass of the star Gliese 777 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 777 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 icon
Temperature: 3146 K | 0.54 T Sun
+
Star temperature
Surface temperature of Gliese 777 B is 3146 K, which is 54 % 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 777 system structure

 Gliese 777 A
Gliese 777 A c 0.13 AU 19.1 M⊕ 17.1 days
Gliese 777 A d 0.39 AU 11.5 M⊕ 2 R⊕ 88.7 days
Gliese 777 A b 4.01 AU 495.9 M⊕ 2915 days
Gliese 777 B 3000 AU

More about Gliese 777

       Gliese 777 can be found in northern celestial hemisphere, and it is possible to see it with naked eye. The star is easily observable from Northern America, Europe and Asia.
Other designations of this star
LHS 3509, G 186-9, LFT 1514, LTT 15865, NLTT 48646, TIC 239481097, WISEA J200327.13+295153.9, BD+29°3872, GJ 777, HD 190360, HIC 98767, HIP 98767, HR 7670, LHS 3510, GJ 9683, Gliese 9683, 2MASS J20033732+2953493, TIC 105999792, TYC 2153-2883-1, WISEA J200337.97+295343.4, Gaia EDR3 2029433521248546304
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External sources
icon study
icon study
simbad icon
Simbad database (G 125-55)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 2029432043779954432)
Archive from the Gaia mission

Frequently Asked Questions

How far is the Gliese 777 system from the Sun?

The Gliese 777 system is 52 light years or 16.0 parsecs from the Sun.

What galaxy is the Gliese 777 star in?

The Gliese 777 is in the Milky Way galaxy just like the Sun.

How many stars are in the Gliese 777 system?

The Gliese 777 system contains 2 stars.

What type of star is the Gliese 777?

The primary in the Gliese 777 system is a Yellow star star.

What temperature is star Gliese 777?

The primary in the Gliese 777 system has a temperature of 5672 K. Find out more about the temperature of stars in Stellar guide
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