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Wolf 940
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Star Wolf 940

Binary star Wolf 940 is located 40 light years away from the Sun. It consists of a red dwarf and a brown dwarf. For now, there are no known exoplanets in this star system.
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Sun distance
40 light years
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Wolf 940 A

Red dwarf, High proper motion star
Spectral class: dM4.0

Location +

Ascension iconRight ascension: 21h 46m 41.250s
Declination iconDeclination: -0° 10' 31.862'' (equatorial region)
Parallax iconParallax: 80.738
Distance iconSun distance: 40.397 ly | 12.4 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: 27 % M Sun
| 283 M Jupiter
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Star mass
Mass of the star Wolf 940 A is 0.27 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: 30 % R Sun
| 3 R Jupiter
(estimate)
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Star size
Radius of the star Wolf 940 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: 3352 K | 0.58 T Sun
+
Star temperature
Surface temperature of Wolf 940 A is 3352 K, which is 58 % 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 Wolf 940 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

Photometry

Magnitude iconApparent magnitude (V): 12.7
Magnitude iconAbsolute magnitude (V): 12.2
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

Wolf 940 B

Brown dwarf, , High proper motion star
Spectral class: T8+/Y?

Location +

Distance iconDistance from the primary: 400 AU

Basic characteristic

icon weight
Mass: 2.5 % M Sun
| 26 M Jupiter
+
Star mass
Mass of the star Wolf 940 B is 0.27 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: 9 % R Sun
| 0.9 R Jupiter
+
Star size
Radius of the star Wolf 940 B is 0.09 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: 605 K | 0.1 T Sun
+
Star temperature
Surface temperature of Wolf 940 B is 605 K, which is 10 % 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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Wolf 940 system structure

 Wolf 940 A
Wolf 940 B 400 AU

More about Wolf 940

       Wolf 940 can be found in southern celestial hemisphere, however it is too dim to be seen with the naked eye or even a small telescope.
Other designations of this star
2MASS J21464040-0010233, GJ 1263, Gliese 1263, LHS 3708, LTT 8692, LPM 797, LFT 1660, G 26-30, G 93-35, USNO 467, Gaia EDR3 2681122098893985408
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External sources
simbad icon
Simbad database (Wolf 940 B)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)

Frequently Asked Questions

How far is the Wolf 940 system from the Sun?

The Wolf 940 system is 40 light years or 12.4 parsecs from the Sun.

What galaxy is the Wolf 940 star in?

The Wolf 940 is in the Milky Way galaxy just like the Sun.

How many stars are in the Wolf 940 system?

The Wolf 940 system contains 2 stars.

What type of star is the Wolf 940?

The primary in the Wolf 940 system is a Red dwarf star.

What temperature is star Wolf 940?

The primary in the Wolf 940 system has a temperature of 3352 K. Find out more about the temperature of stars in Stellar guide
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