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12 Boötis Ab
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Star 12 Boötis Ab

Subgiant 12 Boötis Ab is located 117 light years away from the Sun. It is a single star, that has 137 % of solar mass. For now, there are no known exoplanets in this star system.
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Sun distance
117 light years
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12 Boötis Ab

Subgiant

Basic characteristic

icon weight
Mass: 136.8 % M Sun
| 1433 M Jupiter
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Star mass
Mass of the star 12 Boötis Ab is 1.3677 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
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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
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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
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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
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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 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 Ab system structure

 12 Boötis Aa
12 Boötis Ab

More about 12 Boötis Ab

12 Boötis Ab is is approximately 90 % bigger than the Sun and temperature on its surface is around 6230 K (5957 °C), which is about 108 % of Sun's temperature.
       12 Boötis Ab can be found in northern celestial hemisphere.
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External sources
icon study
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Scientific study, Accepted: 29. 12. 2026
icon study
A Sample of Thick-Disk Stars Hosting Hot Jupiters
Scientific study, Accepted: 16. 10. 2026
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icon study
icon study
icon study
icon study
icon study
icon study
A Spatial Map of the Atmospheric Limb of a Hot Jupiter
Scientific study, Accepted: 14. 10. 2026
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News from this star system

WASP-33 b and other hot Jupiters identified as prime targets for structural studies
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Image: WASP-33 b and other hot Jupiters identified as prime targets for structural studies
WASP-33 b, WASP-76 b, and HAT-P-32 b are identified as the best candidates for studying how stellar gravity shapes exoplanet interiors. Measuring their physical deformation will help reveal their deep, internal density structures using JWST and Ariel data....
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Atmospheric structure of WASP-94 A b revealed through new limb asymmetry method
iconToday
Image: Atmospheric structure of WASP-94 A b revealed through new limb asymmetry method
A new analysis of WASP-94 A b reveals a 415 K temperature difference between its morning and evening sides. The evening atmosphere shows signs of H2O, CO2, CO, and H2S, while the morning side remains obscured by aerosols....
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Thick-disk stars identified as hosts to ancient hot jupiter planets
iconToday
Image: Thick-disk stars identified as hosts to ancient hot jupiter planets
New analysis of 268 stars identifies several hot Jupiters orbiting ancient stars in the Milky Way's thick disk. These systems, over 8 billion years old, show distinct differences in mass and orbital periods compared to younger thin-disk populations....
Read article tag icon

Frequently Asked Questions

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

The 12 Boötis Ab system is 117 light years or 35.8 parsecs from the Sun.

What galaxy is the 12 Boötis Ab star in?

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

How many stars are in the 12 Boötis Ab system?

The 12 Boötis Ab is a single star, there are no other known stars in the system.

What type of star is the 12 Boötis Ab?

The star 12 Boötis Ab is a Subgiant star.

What temperature is star 12 Boötis Ab?

The star 12 Boötis Ab has an effective temperature of 6230 K. Find out more about the temperature of stars in Stellar guide
Class of stars Subgiant
A subgiant is a term used to describe a luminous star that is typically running out of hydrogen for nuclear fusion and is thus departing from the main sequence. These stars are classified as Yerkes luminosity class IV.
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