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Delta Herculis Aa
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Star Delta Herculis Aa

Triple star system Delta Herculis Aa is located 77 light years away from the Sun. It is a system with 3 stars. For now, there are no known exoplanets in this star system.
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Sun distance
77 light years
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Delta Herculis Aa

White-Blue star, Spectroscopic binary
Spectral class: A1IVn

Location +

Ascension iconRight ascension: 17h 15m 1.886s
Declination iconDeclination: 24° 50' 18.623'' (northern hemisphere)
Parallax iconParallax: 42.481
Distance iconSun distance: 76.777 ly | 23.5 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: 240 % M Sun
| 2514 M Jupiter
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Star mass
Mass of the star Delta Herculis Aa is 2.4 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: 220 % R Sun
| 21.9 R Jupiter
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Star size
Radius of the star Delta Herculis Aa is 2.2 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: 9620 K | 1.66 T Sun
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Star temperature
Surface temperature of Delta Herculis Aa is 9620 K, which is 166 % 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: 0.370 billions years | 0.08 Sun
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Star age
Star Delta Herculis Aa is 0.370 billion years old, which is about 0.08 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: 38 L Sun
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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): 3.1
Magnitude iconAbsolute magnitude (V): 1.3
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

Delta Herculis Ab

Unknown star type, , Spectroscopic binary

Basic characteristic

temperature iconTemperature: 9300 K
 (estimate)
+
Star temperature
Surface temperature of Delta Herculis Ab is estimated to be 9335 K, which is 161 % 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

Delta Herculis B

Unknown star type, , , Spectroscopic binary

Basic characteristic

temperature iconTemperature: 9300 K
 (estimate)
+
Star temperature
Surface temperature of Delta Herculis B is estimated to be 9335 K, which is 161 % 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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Delta Herculis Aa system structure

 Delta Herculis Aa
Delta Herculis Ab
Delta Herculis B

More about Delta Herculis Aa

       Delta 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
Sarin, δ Her, 65 Her, BD 25° 3221, CCDM J17151+2451A, FK5 641, GC 23294, HD 156164, HIP 84379, HR 6410, SAO 84951, Gaia EDR3 4573412435280434560
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Frequently Asked Questions

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

The Delta Herculis Aa system is 77 light years or 23.5 parsecs from the Sun.

What galaxy is the Delta Herculis Aa star in?

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

How many stars are in the Delta Herculis Aa system?

The Delta Herculis Aa system contains 3 stars.

What type of star is the Delta Herculis Aa?

The primary in the Delta Herculis Aa system is a White-Blue star star.

What temperature is star Delta Herculis Aa?

The primary in the Delta Herculis Aa system has a temperature of 9620 K. Find out more about the temperature of stars in Stellar guide
Possible companions

 Sol
 1 M☉ 0 ly
Closest stars

 Alpha Centauri
 1.1 M☉ 4.4 ly

Barnard star
 0.14 M☉ 6 ly

Luhman 16
 0.03 M☉ 6.5 ly

WISE 0855-0714
 0.01 M☉ 7.3 ly

Wolf 359
 0.11 M☉ 7.9 ly
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exoplanet iconAbout Stellar Catalog

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Working with real data
icon Data in Stellar Catalog come from trusted scientific sources. Primary source is Gaia space telescope mapping the stars in Milky Way. Other sources include research papers, Simbad catalog and Exoplanet.eu database.
Estimated values
icon Objects listed in the Stellar Catalog often have values that are estimates. These estimates are determined using their known characteristics, such as spectral type, brightness across different wavelengths, distance from a star, and other factors.
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