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Capella Aa
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Star Capella Aa

Multiple star system Capella Aa is located 44 light years away from the Sun. It is a system with 4 stars. 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 Aa

Yellow giant, Spectroscopic binary
Spectral class: G3III:

Location +

Ascension iconRight ascension: 5h 17m 24.002s
Declination iconDeclination: 45° 50' 16.065'' (northern hemisphere)
Parallax iconParallax: 74.952
Distance iconSun distance: 43.515 ly | 13.3 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: 256.9 % M Sun
| 2691 M Jupiter
+
Star mass
Mass of the star Capella Aa is 2.5687 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: 1198 % R Sun
| 119.2 R Jupiter
+
Star size
Radius of the star Capella Aa is 11.98 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: 4970 K | 0.86 T Sun
+
Star temperature
Surface temperature of Capella Aa is 4970 K, which is 86 % 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: 78.7 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): 0.1
Magnitude iconAbsolute magnitude (V): -0.5
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

Capella Ab

Red giant, , Spectroscopic binary
Spectral class: K0III

Basic characteristic

icon weight
Mass: 248.3 % M Sun
| 2601 M Jupiter
+
Star mass
Mass of the star Capella Ab is 2.5687 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
+
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
+
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
+
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

Capella H

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

Basic characteristic

icon weight
Mass: 57 % M Sun
| 597 M Jupiter
+
Star mass
Mass of the star Capella H 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: 54 % R Sun
| 5.4 R Jupiter
+
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
+
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
+
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

Capella L

Red dwarf, High proper motion star
Spectral class: M4

Basic characteristic

icon weight
Mass: 53 % M Sun
| 555 M Jupiter
+
Star mass
Mass of the star Capella L 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: 60 % R Sun
| 5.9 R Jupiter
(estimate)
+
Star size
Radius of the star Capella L is not known. Its estimated value based on other similar stars is about 60 % 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 iconTemperature: 3300 K
 (estimate)
+
Star temperature
Surface temperature of Capella L is estimated to be 3300 K, which is 57 % 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

Magnitude iconApparent magnitude (V): 13.7
Magnitude iconAbsolute magnitude (V): 13.1
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 Aa system structure

 Capella Aa
Capella Ab
Capella H
Capella L

More about Capella Aa

       Capella 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
G 96-29, LTT 11622, NLTT 14788, PPM 47938, 2MASS J05172386+4550229, 13 Aur, ANJ 1, FRH 1A, ADS 3841 AP, CEL 586, 2E 1239, FK5 193, GJ 194, Gliese 194, HD 34029, HIC 24608, HIP 24608, HR 1708, JP11 1010, LSPM J0516+4559, LTT 11619, 2MASS J05164138+4559525, N30 1121, NLTT 14766, NSV 1897, SBC7 214, TIC 368326352, TYC 3358-3141-1, UBV 5009, VVO 236, YPAC 23, Alhajoth, Hokulei, α Aurigae, 13 Aurigae, Capella, Alpha Aurigae, Gaia EDR3 211810233512673792
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External sources
simbad icon
Simbad database (G 96-29B)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 211810233512673920)
Archive from the Gaia mission

Frequently Asked Questions

How far is the Capella Aa system from the Sun?

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

What galaxy is the Capella Aa star in?

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

How many stars are in the Capella Aa system?

The Capella Aa system contains 4 stars.

What type of star is the Capella Aa?

The primary in the Capella Aa system is a Yellow giant star.

What temperature is star Capella Aa?

The primary in the Capella Aa system has a temperature of 4970 K. Find out more about the temperature of stars in Stellar guide
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