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Alpha Mensae
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Star Alpha Mensae

Binary star Alpha Mensae is located 33 light years away from the Sun. It consists of a yellow star and a red dwarf. For now, there are no known exoplanets in this star system.
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Sun distance
33 light years
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Alpha Mensae

Yellow star, High proper motion star
Spectral class: G7 V

Location +

Ascension iconRight ascension: 6h 10m 14.968s
Declination iconDeclination: -74° 45' 14.357'' (southern hemisphere)
Parallax iconParallax: 97.916
Distance iconSun distance: 33.310 ly | 10.2 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: 110.3 % M Sun
| 1155 M Jupiter
+
Star mass
Mass of the star Alpha Mensae is 1.103 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: 99 % R Sun
| 9.9 R Jupiter
+
Star size
Radius of the star Alpha Mensae is 0.99 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: 5580 K | 0.97 T Sun
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Star temperature
Surface temperature of Alpha Mensae is 5580 K, which is 97 % 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: 5.4 billions years | 1.17 Sun
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Star age
Star Alpha Mensae is 5.4 billion years old, which is about 1.17 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: 0.819 L Sun
+
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

Magnitude iconApparent magnitude (V): 5.1
Magnitude iconAbsolute magnitude (V): 5
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

Gaia EDR3 5264749303457104384

Red dwarf, , High proper motion star

Basic characteristic

icon weight
Mass: 20 % M Sun
| 188.6 M Jupiter
 (estimate)
+
Star mass
The mass of the star Gaia EDR3 5264749303457104384 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
| 2.2 R Jupiter
(estimate)
+
Star size
Radius of the star Gaia EDR3 5264749303457104384 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 Gaia EDR3 5264749303457104384 is estimated to be 3207 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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Alpha Mensae system structure

 Alpha Mensae
Gaia EDR3 5264749303457104384

More about Alpha Mensae

       Alpha Mensae can be found in southern celestial hemisphere, and it is possible to see it with naked eye.
Other designations of this star
Alpha Mensae B, Alf Men, Alp Men, CD−74° 294, FK5 239, GJ 231, Gliese 231, HD 43834, HIP 29271, HR 2261, SAO 256274, LTT 2490, Gaia EDR3 5264749303462961280
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External sources
gaia icon
Gaia database (Gaia EDR3 5264749303457104384)
Archive from the Gaia mission

Frequently Asked Questions

How far is the Alpha Mensae system from the Sun?

The Alpha Mensae system is 33 light years or 10.2 parsecs from the Sun.

What galaxy is the Alpha Mensae star in?

The Alpha Mensae is in the Milky Way galaxy just like the Sun.

How many stars are in the Alpha Mensae system?

The Alpha Mensae system contains 2 stars.

What type of star is the Alpha Mensae?

The primary in the Alpha Mensae system is a Yellow star star.

What temperature is star Alpha Mensae?

The primary in the Alpha Mensae system has a temperature of 5580 K. Find out more about the temperature of stars in Stellar guide
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