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Zeta Herculis
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Star Zeta Herculis

Binary star Zeta Herculis is located 35 light years away from the Sun. It consists of a subgiant and a yellow star. For now, there are no known exoplanets in this star system.
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Sun distance
35 light years
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Zeta Herculis A

Subgiant, Spectroscopic binary
Spectral class: F9 IV

Location +

Ascension iconRight ascension: 16h 41m 17.161s
Declination iconDeclination: 31° 36' 9.787'' (northern hemisphere)
Parallax iconParallax: 93.320
Distance iconSun distance: 35.000 ly | 10.7 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: 145 % M Sun
| 1519 M Jupiter
+
Star mass
Mass of the star Zeta Herculis A is 1.45 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: 256 % R Sun
| 25.5 R Jupiter
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Star size
Radius of the star Zeta Herculis A is 2.56 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: 5759 K | 1 T Sun
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Star temperature
Surface temperature of Zeta Herculis A is 5759 K, which is 100 % 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: 6.2 billions years | 1.35 Sun
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Star age
Star Zeta Herculis A is 6.2 billion years old, which is about 1.35 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: 6.55 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): 2.8
Magnitude iconAbsolute magnitude (V): 2.7
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

Zeta Herculis B

Yellow star, , Spectroscopic binary
Spectral class: G7 V

Basic characteristic

icon weight
Mass: 98 % M Sun
| 1027 M Jupiter
+
Star mass
Mass of the star Zeta Herculis B is 1.45 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: 92 % R Sun
| 9.1 R Jupiter
+
Star size
Radius of the star Zeta Herculis B is 0.915 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: 5500 K
 (estimate)
+
Star temperature
Surface temperature of Zeta Herculis B is estimated to be 5473 K, which is 95 % 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: 6.2 billions years | 1.35 Sun
+
Star age
Star Zeta Herculis B is 6.2 billion years old, which is about 1.35 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: 0.62 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
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Zeta Herculis system structure

 Zeta Herculis A
Zeta Herculis B

More about Zeta Herculis

       Zeta Herculis 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
ζ Her, 40 Her, ADS 10157 AB, BD+31 2884, GJ 635, HD 150680, HIP 81693, HR 6212, LHS 3234, LTT 14952, SAO 65485, WDS J16413+3136AB, zet Her
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Frequently Asked Questions

How far is the Zeta Herculis system from the Sun?

The Zeta Herculis system is 35 light years or 10.7 parsecs from the Sun.

What galaxy is the Zeta Herculis star in?

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

How many stars are in the Zeta Herculis system?

The Zeta Herculis system contains 2 stars.

What type of star is the Zeta Herculis?

The primary in the Zeta Herculis system is a Subgiant star.

What temperature is star Zeta Herculis?

The primary in the Zeta Herculis system has a temperature of 5759 K. Find out more about the temperature of stars in Stellar guide
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30. 10. 2026
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The early architecture of planetary systems may be set at birth: a study of Sun-like stars found similar rates of star-planet misalignment across different stages of development. Other findings trace how water and carbon dioxide ice fade around young stars, why white-dwarf debris resists breaking into tiny pieces, and why a reported planet around Gliese 48 remains unconfirmed.
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