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Gamma Tucanae
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Star Gamma Tucanae

Binary star Gamma Tucanae is located 74 light years away from the Sun. It consists of a yellow-white star and a red dwarf. For now, there are no known exoplanets in this star system.
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Sun distance
74 light years
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Gamma Tucanae A

Yellow-White star, High proper motion star
Spectral class: F4V

Location +

Ascension iconRight ascension: 23h 17m 25.739s
Declination iconDeclination: -58° 14' 7.332'' (southern hemisphere)
Parallax iconParallax: 44.081
Distance iconSun distance: 73.991 ly | 22.7 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: 155 % M Sun
| 1624 M Jupiter
+
Star mass
Mass of the star Gamma Tucanae A is 1.55 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: 220 % R Sun
| 21.9 R Jupiter
+
Star size
Radius of the star Gamma Tucanae A is 2.2 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: 6679 K | 1.16 T Sun
+
Star temperature
Surface temperature of Gamma Tucanae A is 6679 K, which is 116 % 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: 1.414 billions years | 0.31 Sun
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Star age
Star Gamma Tucanae A is 1.414 billion years old, which is about 0.31 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: 11.33 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): 4
Magnitude iconAbsolute magnitude (V): 2.2
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

Gamma Tucanae B

Red dwarf, High proper motion star

Basic characteristic

icon weight
Mass: 40 % M Sun
| 366.6 M Jupiter
 (estimate)
+
Star mass
The mass of the star Gamma Tucanae 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: 40 % R Sun
| 4 R Jupiter
(estimate)
+
Star size
Radius of the star Gamma Tucanae B is not known. Its estimated value based on other similar stars is about 40 % 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: 3400 K
 (estimate)
+
Star temperature
Surface temperature of Gamma Tucanae B is estimated to be 3433 K, which is 59 % 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

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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Gamma Tucanae system structure

 Gamma Tucanae A
Gamma Tucanae B

More about Gamma Tucanae

       Gamma Tucanae can be found in southern celestial hemisphere, and it is possible to see it with naked eye.
Other designations of this star
γ Tuc, CPD−58° 8062, FK5 877, GC 32413, GJ 9818, Gliese 9818, HD 219571, HIP 114996, HR 8848, SAO 247814, GSC 08837-01297, Gaia EDR3 6492406743706907776
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External sources
simbad icon
Simbad database (* gam Tuc B)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 6492406743706909568)
Archive from the Gaia mission

Frequently Asked Questions

How far is the Gamma Tucanae system from the Sun?

The Gamma Tucanae system is 74 light years or 22.7 parsecs from the Sun.

What galaxy is the Gamma Tucanae star in?

The Gamma Tucanae is in the Milky Way galaxy just like the Sun.

How many stars are in the Gamma Tucanae system?

The Gamma Tucanae system contains 2 stars.

What type of star is the Gamma Tucanae?

The primary in the Gamma Tucanae system is a Yellow-White star star.

What temperature is star Gamma Tucanae?

The primary in the Gamma Tucanae system has a temperature of 6679 K. Find out more about the temperature of stars in Stellar guide
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