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Gamma Boötis Aa
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Star Gamma Boötis Aa

Binary star Gamma Boötis Aa is located 86 light years away from the Sun. It consists of a subgiant and a . For now, there are no known exoplanets in this star system.
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Sun distance
86 light years
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Gamma Boötis Aa

Subgiant, Delta Scuti variable
Spectral class: A7IV+(n)

Location +

Ascension iconRight ascension: 14h 32m 4.517s
Declination iconDeclination: 38° 18' 32.122'' (northern hemisphere)
Parallax iconParallax: 37.913
Distance iconSun distance: 86.029 ly | 26.4 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: 210 % M Sun
| 2200 M Jupiter
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Star mass
Mass of the star Gamma Boötis Aa is 2.10 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: 465 % R Sun
| 46.3 R Jupiter
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Star size
Radius of the star Gamma Boötis Aa is 4.65 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: 7800 K | 1.35 T Sun
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Star temperature
Surface temperature of Gamma Boötis Aa is 7800 K, which is 135 % 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: 1 billions years | 0.22 Sun
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Star age
Star Gamma Boötis Aa is 1 billion years old, which is about 0.22 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: 33.4 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
Magnitude iconAbsolute magnitude (V): 0.9
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

Gamma Boötis Ab

Unknown star type, , Delta Scuti variable

Basic characteristic

temperature iconTemperature: 8100 K
 (estimate)
+
Star temperature
Surface temperature of Gamma Boötis Ab is estimated to be 8113 K, which is 140 % 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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Gamma Boötis Aa system structure

 Gamma Boötis Aa
Gamma Boötis Ab

More about Gamma Boötis Aa

      a pulsating star belonging to the Delta Scuti category. These stars expand and contract with a period in mere hours.  Gamma Boötis 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. 

      Gamma Boötis Aa is a pulsating star belonging to the Delta Scuti category. These stars expand and contract with a period in mere hours.
Other designations of this star
Seginus, Haris, Ceginus, Segin, Gam Boo, 27 Boötis, BD+38°2565, FK5 535, HD 127762, HIP 71075, HR 5435, SAO 64203, WDS J14321+3818A, BU 616, gam Boo, Gaia DR3 1487434040320076800
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Frequently Asked Questions

How far is the Gamma Boötis Aa system from the Sun?

The Gamma Boötis Aa system is 86 light years or 26.4 parsecs from the Sun.

What galaxy is the Gamma Boötis Aa star in?

The Gamma Boötis Aa is in the Milky Way galaxy just like the Sun.

How many stars are in the Gamma Boötis Aa system?

The Gamma Boötis Aa system contains 2 stars.

What type of star is the Gamma Boötis Aa?

The primary in the Gamma Boötis Aa system is a Subgiant star.

What temperature is star Gamma Boötis Aa?

The primary in the Gamma Boötis Aa system has a temperature of 7800 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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