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Mu Herculis Aa
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Star Mu Herculis Aa

Multiple star system Mu Herculis Aa is located 27 light years away from the Sun. It is a system with 4 stars. For now, there are no known exoplanets in this star system.
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Sun distance
27 light years
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Mu Herculis Aa

Subgiant
Spectral class: G5 IV

Location +

Ascension iconRight ascension: 17h 46m 27.176s
Declination iconDeclination: 27° 43' 2.190'' (northern hemisphere)
Parallax iconParallax: 119.925
Distance iconSun distance: 27.197 ly | 8.3 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: 111 % M Sun
| 1163 M Jupiter
+
Star mass
Mass of the star Mu Herculis Aa is 1.11 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: 173 % R Sun
| 17.2 R Jupiter
+
Star size
Radius of the star Mu Herculis Aa is 1.73 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: 5560 K | 0.96 T Sun
+
Star temperature
Surface temperature of Mu Herculis Aa is 5560 K, which is 96 % 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: 7.8 billions years | 1.7 Sun
+
Star age
Star Mu Herculis Aa is 7.8 billion years old, which is about 1.7 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: 2.54 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): 3.4
Magnitude iconAbsolute magnitude (V): 3.8
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

Mu Herculis Ab

Red dwarf
Spectral class: M4 V

Basic characteristic

icon weight
Mass: 32 % M Sun
| 335 M Jupiter
+
Star mass
Mass of the star Mu Herculis Ab is 1.11 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: 40 % R Sun
| 3.6 R Jupiter
(estimate)
+
Star size
Radius of the star Mu Herculis Ab is not known. Its estimated value based on other similar stars is about 40 % 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: 3300 K
 (estimate)
+
Star temperature
Surface temperature of Mu Herculis Ab is estimated to be 3300 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

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

Mu Herculis B

Red dwarf
Spectral class: M3.5 V

Basic characteristic

icon weight
Mass: 44 % M Sun
| 461 M Jupiter
+
Star mass
Mass of the star Mu Herculis B is 0.32 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: 60 % R Sun
| 6 R Jupiter
+
Star size
Radius of the star Mu Herculis B is 0.6 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: 3386 K | 0.59 T Sun
+
Star temperature
Surface temperature of Mu Herculis B is 3386 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
luminosity icon
Luminosity: 0.087 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

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

Mu Herculis C

Red dwarf
Spectral class: M3.5 V

Basic characteristic

icon weight
Mass: 39 % M Sun
| 409 M Jupiter
+
Star mass
Mass of the star Mu Herculis C is 0.44 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: 40 % R Sun
| 4.4 R Jupiter
(estimate)
+
Star size
Radius of the star Mu Herculis C is not known. Its estimated value based on other similar stars is about 40 % 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: 3300 K
 (estimate)
+
Star temperature
Surface temperature of Mu Herculis C is estimated to be 3341 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

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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Mu Herculis Aa system structure

 Mu Herculis Aa
Mu Herculis Ab
Mu Herculis B
Mu Herculis C

More about Mu Herculis Aa

       Mu Herculis Aa 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
mu.02 Her, 86 Herculis, Gliese 695, GJ 695, HR 6623, BD+27° 2888, HD 161797, LHS 3326/3325, LTT 15266, SAO 85397, FK5 667, LFT 1374, GC 24138, ADS 10786, HIC 86974, HIP 86974, MU Her, * mu.01 Her, Gaia EDR3 4594497769766809216
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External sources
gaia icon
Gaia database (Gaia EDR3 4594497838483177984)
Archive from the Gaia mission

Frequently Asked Questions

How far is the Mu Herculis Aa system from the Sun?

The Mu Herculis Aa system is 27 light years or 8.3 parsecs from the Sun.

What galaxy is the Mu Herculis Aa star in?

The Mu Herculis Aa is in the Milky Way galaxy just like the Sun.

How many stars are in the Mu Herculis Aa system?

The Mu Herculis Aa system contains 4 stars.

What type of star is the Mu Herculis Aa?

The primary in the Mu Herculis Aa system is a Subgiant star.

What temperature is star Mu Herculis Aa?

The primary in the Mu Herculis Aa system has a temperature of 5560 K. Find out more about the temperature of stars in Stellar guide
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