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Gliese 3991
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Star Gliese 3991

Binary star Gliese 3991 is located 25 light years away from the Sun. It consists of a red dwarf and a white dwarf. For now, there are no known exoplanets in this star system.
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Sun distance
25 light years
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Gliese 3991 A

Red dwarf, Spectroscopic binary
Spectral class: M3.5V

Location +

Ascension iconRight ascension: 17h 9m 32.038s
Declination iconDeclination: 43° 40' 48.381'' (northern hemisphere)
Parallax iconParallax: 131.600
Distance iconSun distance: 24.784 ly | 7.6 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: 20 % M Sun
| 210 M Jupiter
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Star mass
Mass of the star Gliese 3991 A is 0.2 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: 10 % R Sun
| 1 R Jupiter
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Star size
Radius of the star Gliese 3991 A is 0.1 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: 3284 K | 0.57 T Sun
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Star temperature
Surface temperature of Gliese 3991 A is 3284 K, which is 57 % 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 billions years | 1.3 Sun
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Star age
Star Gliese 3991 A is 6 billion years old, which is about 1.3 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 iconApparent magnitude (V): 13.7
Magnitude iconAbsolute magnitude (V): 14.3
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 3991 B

White dwarf, , Spectroscopic binary
Spectral class: D12

Basic characteristic

icon weight
Mass: 50 % M Sun
| 524 M Jupiter
+
Star mass
Mass of the star Gliese 3991 B is 0.2 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
time icon
Age: 6 billions years | 1.3 Sun
+
Star age
Star Gliese 3991 B is 6 billion years old, which is about 1.3 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

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 3991 system structure

 Gliese 3991 A
Gliese 3991 B

More about Gliese 3991

       Gliese 3991 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
G 203-47, HIP 83945, USNO 752, Gaia EDR3 1355264565043431040
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Frequently Asked Questions

How far is the Gliese 3991 system from the Sun?

The Gliese 3991 system is 25 light years or 7.6 parsecs from the Sun.

What galaxy is the Gliese 3991 star in?

The Gliese 3991 is in the Milky Way galaxy just like the Sun.

How many stars are in the Gliese 3991 system?

The Gliese 3991 system contains 2 stars.

What type of star is the Gliese 3991?

The primary in the Gliese 3991 system is a Red dwarf star.

What temperature is star Gliese 3991?

The primary in the Gliese 3991 system has a temperature of 3284 K. Find out more about the temperature of stars in Stellar guide
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