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12 Boötis Aa
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Star 12 Boötis Aa

Binary star 12 Boötis Aa is located 119 light years away from the Sun. It consists of 2 subgiant stars. For now, there are no known exoplanets in this star system.
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Sun distance
119 light years
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12 Boötis Aa

Subgiant, Spectroscopic binary
Spectral class: F9IVw

Location +

Ascension iconRight ascension: 14h 10m 23.910s
Declination iconDeclination: 25° 5' 29.080'' (northern hemisphere)
Parallax iconParallax: 27.484
Distance iconSun distance: 118.671 ly | 36.4 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: 141.1 % M Sun
| 1478 M Jupiter
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Star mass
Mass of the star 12 Boötis Aa is 1.4109 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: 290 % R Sun
| 28.9 R Jupiter
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Star size
Radius of the star 12 Boötis Aa is 2.9 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: 6130 K | 1.06 T Sun
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Star temperature
Surface temperature of 12 Boötis Aa is 6130 K, which is 106 % 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: 2.66 billions years | 0.58 Sun
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Star age
Star 12 Boötis Aa is 2.66 billion years old, which is about 0.58 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: 7.53 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): 4.8
Magnitude iconAbsolute magnitude (V): 2
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

12 Boötis Ab

Subgiant, , Spectroscopic binary

Basic characteristic

icon weight
Mass: 136.8 % M Sun
| 1433 M Jupiter
+
Star mass
Mass of the star 12 Boötis Ab is 1.4109 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: 190 % R Sun
| 18.9 R Jupiter
+
Star size
Radius of the star 12 Boötis Ab is 1.9 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: 6230 K | 1.08 T Sun
+
Star temperature
Surface temperature of 12 Boötis Ab is 6230 K, which is 108 % 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: 2.66 billions years | 0.58 Sun
+
Star age
Star 12 Boötis Ab is 2.66 billion years old, which is about 0.58 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: 4.69 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 iconAbsolute magnitude (V): -2.8
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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12 Boötis Aa system structure

 12 Boötis Aa
12 Boötis Ab

More about 12 Boötis Aa

       12 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.
Other designations of this star
d Boötis, 12 Boötis, FK5 522, GC 19127, HIP 69226, HR 5304, HD 123999, Gliese 9470, GJ 9470, BD+25°2737, SAO 83203, WDS J14104+2506AB, CCDM 14104+2505, Gaia DR3 1257529526205454336
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External sources
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Frequently Asked Questions

How far is the 12 Boötis Aa system from the Sun?

The 12 Boötis Aa system is 119 light years or 36.4 parsecs from the Sun.

What galaxy is the 12 Boötis Aa star in?

The 12 Boötis Aa is in the Milky Way galaxy just like the Sun.

How many stars are in the 12 Boötis Aa system?

The 12 Boötis Aa system contains 2 stars.

What type of star is the 12 Boötis Aa?

The primary in the 12 Boötis Aa system is a Subgiant star.

What temperature is star 12 Boötis Aa?

The primary in the 12 Boötis Aa system has a temperature of 6130 K. Find out more about the temperature of stars in Stellar guide
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