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Gliese 669
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Star Gliese 669

Binary star Gliese 669 is located 35 light years away from the Sun. It consists of 2 red dwarf stars. For now, there are no known exoplanets in this star system.
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Sun distance
35 light years
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Gliese 669 B

Red dwarf, flare star
Spectral class: M4.5V

Basic characteristic

icon weight
Mass: 20 % M Sun
| 199 M Jupiter
 (estimate)
+
Star mass
The mass of the star Gliese 669 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 669 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: 3426 K | 0.59 T Sun
+
Star temperature
Surface temperature of Gliese 669 B is 3426 K, which is 59 % 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

Gliese 669 A

Red dwarf, flare star
Spectral class: M3.5V

Location +

Ascension iconRight ascension: 17h 19m 53.960s
Declination iconDeclination: 26° 30' 8.683'' (northern hemisphere)
Parallax iconParallax: 92.986
Distance iconSun distance: 35.076 ly | 10.8 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: 30 % M Sun
| 303.8 M Jupiter
 (estimate)
+
Star mass
The mass of the star Gliese 669 A is unknown. Based on its other characteristics, it is estimated to be about 30 % 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: 30 % R Sun
| 3.3 R Jupiter
(estimate)
+
Star size
Radius of the star Gliese 669 A is not known. Its estimated value based on other similar stars is about 30 % 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: 3162 K | 0.55 T Sun
+
Star temperature
Surface temperature of Gliese 669 A is 3162 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

Magnitude iconApparent magnitude (V): 11.3
Magnitude iconAbsolute magnitude (V): 11.2
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
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Gliese 669 system structure

 Gliese 669 B
Gliese 669 A

More about Gliese 669

Nearby star Gliese 669 is a main sequence star that fuses hydrogen atoms into helium. 
       Gliese 669 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
Ross 867, GJ 669 B, WISE J171952.80+263006.3, 2MASS J17195298+2630026, GJ 669 A, Gliese 669, G 170-35, HIC 84794, HIP 84794, LTT 15139, NLTT 44616, 2MASS J17195422+2630030, RBS 1637, SDSS J171954.30+262957.9, TIC 257798327, TYC 2082-2076-1, V* V647 Her, WISEA J171954.02+263006.7, Ross 868, Gaia EDR3 4574048021719710848
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External sources
simbad icon
Simbad database (Ross 868)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 4574048021719710848)
Archive from the Gaia mission

Frequently Asked Questions

How far is the Gliese 669 system from the Sun?

The Gliese 669 system is 35 light years or 10.8 parsecs from the Sun.

What galaxy is the Gliese 669 star in?

The Gliese 669 is in the Milky Way galaxy just like the Sun.

How many stars are in the Gliese 669 system?

The Gliese 669 system contains 2 stars.

What type of star is the Gliese 669?

The primary in the Gliese 669 system is a Red dwarf star.

What temperature is star Gliese 669?

The primary in the Gliese 669 system has a temperature of 3162 K. Find out more about the temperature of stars in Stellar guide
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LP 388-55
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Zeta Herculis
 1.5 M☉ 6 ly
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