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AB Aurigae
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Star AB Aurigae

Protostar AB Aurigae is located 509 light years away from the Sun. It is a single star of spectral class A0Ve, that has 240 % of solar mass. There is at least one exoplanet in this system.
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Sun distance
509 light years
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AB Aurigae

Protostar
Spectral class: A0Ve

Location +

Ascension iconRight ascension: 4h 55m 45.858s
Declination iconDeclination: 30° 33' 3.908'' (northern hemisphere)
Parallax iconParallax: 6.413
Distance iconSun distance: 508.609 ly | 155.9 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: 240 % M Sun
| 2514 M Jupiter
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Star mass
Mass of the star AB Aurigae is 2.4 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: 250 % R Sun
| 24.9 R Jupiter
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Star size
Radius of the star AB Aurigae is 2.5 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: 9772 K | 1.69 T Sun
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Star temperature
Surface temperature of AB Aurigae is 9772 K, which is 169 % 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: 38 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 iconApparent magnitude (V): 7.1
Magnitude iconAbsolute magnitude (V): 1.1
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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AB Aurigae system structure

 AB Aurigae
AB Aurigae b 93 AU 3179.1 M⊕ 30.8 R⊕ -

More about AB Aurigae

Star AB Aurigae is a main sequence star that fuses hydrogen atoms into helium. It is is approximately 3 times bigger than the Sun and temperature on its surface is around 9772 K (9499 °C), which is about 169 % of Sun's temperature.
       AB Aurigae can be found in northern celestial hemisphere, you cannot see it with naked eye, but you can observe this star with basic telescope. The star is easily observable from Northern America, Europe and Asia.
Other designations of this star
AB Aur, BD+30° 741, HD 31293, HIP 22910, SAO 57506, Gaia DR3 156917493449670656
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External sources
icon study
Azimuthal molecular variations in the AB Aur planet-forming disk
Scientific study, Accepted: 21. 07. 2026
icon study
Destructuring the disk of AB Aurigae: Dynamics and accretion
Scientific study, Accepted: 26. 05. 2026
icon study
icon study
icon study
icon study
icon study
icon study
SO as shock tracer in protoplanetary disks: the AB Aurigae case
Scientific study, Accepted: 26. 08. 2024
icon study
icon study
gaia icon
Gaia database (Gaia DR3 156917493449670656)
Archive from the Gaia mission

News from this star system

Chemical map of AB Aurigae reveals how planet formation alters surrounding material
icon1. 8. 2026
Image: Chemical map of AB Aurigae reveals how planet formation alters surrounding material
Observations of the AB Aurigae protoplanetary disk reveal significant chemical variations. The distribution of molecules like sulfur monoxide and hydrocarbons suggests that both incoming space material and planet formation shape the chemistry of the building blocks of planets....
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AB Aurigae’s disk shows complex dynamics and accretion activity
icon27. 5. 2026
Image: AB Aurigae’s disk shows complex dynamics and accretion activity
New observations of AB Aurigae’s disk reveal complex dynamics and ongoing accretion. Inner disk regions show sub-Keplerian motion, and some features may be massive protoplanets on inclined orbits....
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Searching for hidden companions within the dusty disks of young stars
icon15. 2. 2026
Image: Searching for hidden companions within the dusty disks of young stars
...
Read article tag icon

Frequently Asked Questions

How far is the AB Aurigae system from the Sun?

The AB Aurigae system is 509 light years or 155.9 parsecs from the Sun.

What galaxy is the AB Aurigae star in?

The AB Aurigae is in the Milky Way galaxy just like the Sun.

How many stars are in the AB Aurigae system?

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

What type of star is the AB Aurigae?

The star AB Aurigae is a Protostar star.

What temperature is star AB Aurigae?

The star AB Aurigae has an effective temperature of 9772 K. Find out more about the temperature of stars in Stellar guide
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