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99 Herculis
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Star 99 Herculis

Binary star 99 Herculis is located 51 light years away from the Sun. It consists of a yellow-white star and a orange star. For now, there are no known exoplanets in this star system.
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Nearby stars catalogue
Sun distance
51 light years
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99 Herculis A

Yellow-White star, Spectroscopic binary
Spectral class: F7VgF7mF5

Location +

Ascension iconRight ascension: 18h 7m 1.467s
Declination iconDeclination: 30° 33' 44.449'' (northern hemisphere)
Parallax iconParallax: 63.394
Distance iconSun distance: 51.449 ly | 15.8 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: 94 % M Sun
| 985 M Jupiter
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Star mass
Mass of the star 99 Herculis A is 0.94 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: 110 % R Sun
| 10.9 R Jupiter
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Star size
Radius of the star 99 Herculis A is 1.1 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: 5938 K | 1.03 T Sun
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Star temperature
Surface temperature of 99 Herculis A is 5938 K, which is 103 % 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: 9.37 billions years | 2.04 Sun
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Star age
Star 99 Herculis A is 9.37 billion years old, which is about 2.04 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: 1.96 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): 4.1
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

99 Herculis B

Orange star, High proper motion star
Spectral class: K4V

Basic characteristic

icon weight
Mass: 46 % M Sun
| 482 M Jupiter
+
Star mass
Mass of the star 99 Herculis B is 0.94 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: 74 % R Sun
| 7.4 R Jupiter
+
Star size
Radius of the star 99 Herculis B is 0.74 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 99 Herculis B is estimated to be 4660 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
luminosity icon
Luminosity: 0.14 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): 9
Magnitude iconAbsolute magnitude (V): 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
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99 Herculis system structure

 99 Herculis A
99 Herculis A Dust disc 10 AU -
99 Herculis B

More about 99 Herculis

       99 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
b Her, 99 Her, BD+30°3128, GJ 704, HD 165908, HIP 88745, HR 6775, SAO 66648, Gaia EDR3 4590758227641991424
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External sources
icon study
icon study
icon study
simbad icon
Simbad database (* b Her B)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)

Frequently Asked Questions

How far is the 99 Herculis system from the Sun?

The 99 Herculis system is 51 light years or 15.8 parsecs from the Sun.

What galaxy is the 99 Herculis star in?

The 99 Herculis is in the Milky Way galaxy just like the Sun.

How many stars are in the 99 Herculis system?

The 99 Herculis system contains 2 stars.

What type of star is the 99 Herculis?

The primary in the 99 Herculis system is a Yellow-White star star.

What temperature is star 99 Herculis?

The primary in the 99 Herculis system has a temperature of 5938 K. Find out more about the temperature of stars in Stellar guide
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