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Capella Ab
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Star Capella Ab

Red giant Capella Ab is located 44 light years away from the Sun. It is a single star of spectral class K0III, that has 248 % of solar mass. For now, there are no known exoplanets in this star system.
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Sun distance
44 light years
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Capella Ab

Red giant
Spectral class: K0III

Basic characteristic

icon weight
Mass: 248.3 % M Sun
| 2601 M Jupiter
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Star mass
Mass of the star Capella Ab is 2.4828 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: 883 % R Sun
| 87.9 R Jupiter
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Star size
Radius of the star Capella Ab is 8.83 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: 5730 K | 0.99 T Sun
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Star temperature
Surface temperature of Capella Ab is 5730 K, which is 99 % 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: 72.7 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
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Capella Ab system structure

 Capella Aa
Capella Ab
Capella H
Capella L

More about Capella Ab

Capella Ab is is approximately 9 times bigger than the Sun and temperature on its surface is around 5730 K (5457 °C), which is about 99 % of Sun's temperature.
       Capella Ab can be found in northern celestial hemisphere.
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External sources
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Scientific study, Accepted: 29. 12. 2026
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A Spatial Map of the Atmospheric Limb of a Hot Jupiter
Scientific study, Accepted: 14. 10. 2026
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icon study
icon study
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Peering into the Midplane of the DM Tau Disk using N2H+ and DCO+
Scientific study, Accepted: 13. 10. 2026

News from this star system

Molecular emission in the disk around DM Tauri reveals complex chemical processes
iconToday
Image: Molecular emission in the disk around DM Tauri reveals complex chemical processes
Observations of the disk around DM Tauri reveal how N2H+ and DCO+ molecules are distributed. The data show that external UV radiation and cosmic rays influence the chemical makeup of the disk out to 400 astronomical units, impacting how planets may form....
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Narrow ring of gas found near the young star HD 152384
iconToday
Image: Narrow ring of gas found near the young star HD 152384
A narrow ring of gas has been characterized around the young star HD 152384. Located at the dust sublimation radius, the ring likely formed from the collisions of rocky planetesimals, offering a new look at early planetary system evolution....
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Atmospheric composition of hot Jupiter KELT-2A b reveals chemical history
iconToday
Image: Atmospheric composition of hot Jupiter KELT-2A b reveals chemical history
New observations of hot Jupiter KELT-2A b confirm water vapor in its atmosphere. The planet shows a carbon-to-oxygen ratio similar to its host star but with overall lower metallicity, suggesting a complex migration history from far out in its star system....
Read article tag icon

Frequently Asked Questions

How far is the Capella Ab system from the Sun?

The Capella Ab system is 44 light years or 13.3 parsecs from the Sun.

What galaxy is the Capella Ab star in?

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

How many stars are in the Capella Ab system?

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

What type of star is the Capella Ab?

The star Capella Ab is a Red giant star.

What temperature is star Capella Ab?

The star Capella Ab has an effective temperature of 5730 K. Find out more about the temperature of stars in Stellar guide
Class of stars Red giant
White dwarfs are the hot, extremely dense stellar remnants left behind by stars that originally had masses between about 0.5 and 8 times the mass of the Sun during their main sequence lifetimes. After exhausting their nuclear fuel, these stars shed their outer layers and leave behind a compact core. Although white dwarfs contain between roughly 0.2 and 1.44 solar masses, this mass is packed into a volume comparable to that of an Earth-sized planet, making them some of the densest objects in the Universe.
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