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AC Herculis
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Star AC Herculis

Binary star AC Herculis is located 5540 light years away from the Sun. It consists of a red supergiant and a subgiant. For now, there are no known exoplanets in this star system.
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Sun distance
5540 light years
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AC Herculis A

Red supergiant
Spectral class: F2pIb

Location +

Ascension iconRight ascension: 18h 30m 16.239s
Declination iconDeclination: 21° 52' 0.586'' (northern hemisphere)
Parallax iconParallax: 0.589
Distance iconSun distance: 5,540.190 ly | 1,698.6 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: 60 % M Sun
| 629 M Jupiter
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Star mass
Mass of the star AC Herculis A is 0.6 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: 4710 % R Sun
| 468.7 R Jupiter
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Star size
Radius of the star AC Herculis A is 47.1 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: 5900 K | 1.02 T Sun
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Star temperature
Surface temperature of AC Herculis A is 5900 K, which is 102 % 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: 2475 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

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

AC Herculis B

Subgiant
Spectral class: K4e

Basic characteristic

icon weight
Mass: 120 % M Sun
| 1257 M Jupiter
+
Star mass
Mass of the star AC Herculis B is 0.6 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: 80 % R Sun
| 8.3 R Jupiter
(estimate)
+
Star size
Radius of the star AC Herculis B is not known. Its estimated value based on other similar stars is about 80 % 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: 4700 K
 (estimate)
+
Star temperature
Surface temperature of AC Herculis B is estimated to be 4664 K, which is 81 % 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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AC Herculis system structure

 AC Herculis A
AC Herculis B

More about AC Herculis

       AC Herculis can be found in northern celestial hemisphere, you cannot see it with naked eye, but you can observe this star with basic telescope. The star is easily observable from Northern America, Europe and Asia.
Other designations of this star
AC Her, GSC 01581-01726, HD 170756, HIP 90697, BD+21°3459, 2MASS J18301623+2152007, IRAS 18281+2149, AAVSO 1826+21
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External sources
icon study
AC Her: Evidence of the first polar circumbinary planet
Scientific study, Accepted: 30. 10. 2023
icon study

Frequently Asked Questions

How far is the AC Herculis system from the Sun?

The AC Herculis system is 5540 light years or 1,698.6 parsecs from the Sun.

What galaxy is the AC Herculis star in?

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

How many stars are in the AC Herculis system?

The AC Herculis system contains 2 stars.

What type of star is the AC Herculis?

The primary in the AC Herculis system is a Red supergiant star.

What temperature is star AC Herculis?

The primary in the AC Herculis system has a temperature of 5900 K. Find out more about the temperature of stars in Stellar guide
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