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Star Capella H

Red dwarf Capella H is located 44 light years away from the Sun. It is a single star of spectral class M2.5 V, that has 57 % of solar mass. For now, there are no known exoplanets in this star system.
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Sun distance
44 light years

Capella H

Red dwarf, High proper motion star
Spectral class: M2.5 V

Basic characteristic

icon weight
Mass: 57 % M Sun
| 597 M Jupiter
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Star mass
Mass of the star Capella H is 0.57 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: 54 % R Sun
| 5.4 R Jupiter
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Star size
Radius of the star Capella H is 0.54 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: 3700 K | 0.64 T Sun
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Star temperature
Surface temperature of Capella H is 3700 K, which is 64 % 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: 0.05 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

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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Capella H system structure

Capella Aa
Capella Ab
Capella H
Capella L

More about Capella H

Capella H is approximately 50 % of the size of Sun and temperature on its surface is around 3700 K (3427 °C), which is about 64 % of Sun's temperature.
       Capella H can be found in northern celestial hemisphere. 
Other designations of this star
G 96-29, LTT 11622, NLTT 14788, PPM 47938, 2MASS J05172386+4550229
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External sources
icon study
_empty
Scientific study, Accepted: 29. 12. 2026
icon study
A Spatial Map of the Atmospheric Limb of a Hot Jupiter
Scientific study, Accepted: 14. 10. 2026
simbad icon
Simbad database (G 96-29)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)

Frequently Asked Questions

How far is the Capella H system from the Sun?

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

What galaxy is the Capella H star in?

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

How many stars are in the Capella H system?

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

What type of star is the Capella H?

The star Capella H is a Red dwarf star.

What temperature is star Capella H?

The star Capella H has an effective temperature of 3700 K. Find out more about the temperature of stars in Stellar guide
Class of stars Red dwarf
Red dwarfs are small, cool stars with surface temperatures of about 2,000–3,800 K, much cooler than the Sun. They usually have 8–50% of the Sun’s mass and shine very faintly, sometimes at just a tiny fraction of the Sun’s brightness. Classified mainly as spectral type M, they are the most common stars in the Milky Way, making up roughly 70–75% of its stellar population.

They fuse hydrogen slowly through the proton–proton chain and are fully convective, which allows them to use their fuel very efficiently. As a result, red dwarfs can live for tens of billions to trillions of years—far longer than the Sun. Many exoplanets orbit red dwarfs, including some in close habitable zones, though strong stellar activity can affect planetary environments.
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