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Aldebaran
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Star Aldebaran

Binary star Aldebaran is located 67 light years away from the Sun. It consists of a red giant and a red dwarf. There is at least one exoplanet in this system.
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Sun distance
67 light years
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Aldebaran

Red giant
Spectral class: K5+III B

Location +

Ascension iconRight ascension: 4h 35m 55.248s
Declination iconDeclination: 16° 30' 33.488'' (equatorial region)
Parallax iconParallax: 48.940
Distance iconSun distance: 66.644 ly | 20.4 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: 116 % M Sun
| 1215 M Jupiter
+
Star mass
Mass of the star Aldebaran is 1.16 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: 4510 % R Sun
| 448.8 R Jupiter
+
Star size
Radius of the star Aldebaran is 45.1 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: 3900 K | 0.67 T Sun
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Star temperature
Surface temperature of Aldebaran is 3900 K, which is 67 % 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: 6.4 billions years | 1.39 Sun
+
Star age
Star Aldebaran is 6.4 billion years old, which is about 1.39 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: 439 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): 0.9
Magnitude iconAbsolute magnitude (V): -0.7
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

Aldebaran B

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

Basic characteristic

icon weight
Mass: 40 % M Sun
| 377.1 M Jupiter
 (estimate)
+
Star mass
The mass of the star Aldebaran B is unknown. Based on its other characteristics, it is estimated to be about 40 % of the Sun's mass.

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
| 5.5 R Jupiter
(estimate)
+
Star size
Radius of the star Aldebaran B 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: 3500 K
 (estimate)
+
Star temperature
Surface temperature of Aldebaran B is estimated to be 3460 K, which is 61 % 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): 13.6
Magnitude iconAbsolute magnitude (V): 12
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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Aldebaran system structure

 Aldebaran
Aldebaran b
unconfirmed
 1.46 AU 1843.9 M⊕ 772.8 days
Aldebaran B

More about Aldebaran

       Aldebaran 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
Alpha Tauri, Alf Tau B, Alpha Tau, α Tau, alf Tau, 87 Tauri, BD+16°629, GJ 171.1, Gliese 171.1, HD 29139, HIC 21421, HIP 21421, HR 1457, SAO 94027
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External sources
simbad icon
Simbad database (* alf Tau B)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 3313069881590622848)
Archive from the Gaia mission

Frequently Asked Questions

How far is the Aldebaran system from the Sun?

The Aldebaran system is 67 light years or 20.4 parsecs from the Sun.

What galaxy is the Aldebaran star in?

The Aldebaran is in the Milky Way galaxy just like the Sun.

How many stars are in the Aldebaran system?

The Aldebaran system contains 2 stars.

What type of star is the Aldebaran?

The primary in the Aldebaran system is a Red giant star.

What temperature is star Aldebaran?

The primary in the Aldebaran system has a temperature of 3900 K. Find out more about the temperature of stars in Stellar guide
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