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Zeta Trianguli Australis
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Star Zeta Trianguli Australis

Binary star Zeta Trianguli Australis is located 39 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
39 light years
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Zeta Trianguli Australis A

Yellow-White star, Spectroscopic binary
Spectral class: F9V

Location +

Ascension iconRight ascension: 16h 28m 28.775s
Declination iconDeclination: -70° 5' 2.075'' (southern hemisphere)
Parallax iconParallax: 82.870
Distance iconSun distance: 39.358 ly | 12.1 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: 112 % M Sun
| 1173 M Jupiter
+
Star mass
Mass of the star Zeta Trianguli Australis A is 1.12 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: 120 % R Sun
| 11.7 R Jupiter
(estimate)
+
Star size
Radius of the star Zeta Trianguli Australis A is not known. Its estimated value based on other similar stars is about 120 % 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: 6051 K | 1.05 T Sun
+
Star temperature
Surface temperature of Zeta Trianguli Australis A is 6051 K, which is 105 % 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: 0.8 billions years | 0.17 Sun
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Star age
Star Zeta Trianguli Australis A is 0.8 billion years old, which is about 0.17 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

Photometry

Magnitude iconApparent magnitude (V): 4.9
Magnitude iconAbsolute magnitude (V): 4.5
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

Zeta Trianguli Australis B

Red dwarf, , Spectroscopic binary

Basic characteristic

icon weight
Mass: 40 % M Sun
| 419 M Jupiter
+
Star mass
Mass of the star Zeta Trianguli Australis B is 1.12 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: 40 % R Sun
| 4 R Jupiter
(estimate)
+
Star size
Radius of the star Zeta Trianguli Australis 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: 3600 K
 (estimate)
+
Star temperature
Surface temperature of Zeta Trianguli Australis B is estimated to be 3622 K, which is 62 % 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 iconAbsolute magnitude (V): -0.4
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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Zeta Trianguli Australis system structure

 Zeta Trianguli Australis A
Zeta Trianguli Australis B

More about Zeta Trianguli Australis

       Zeta Trianguli Australis can be found in southern celestial hemisphere, and it is possible to see it with naked eye.
Other designations of this star
* zet TrA, CD -69°2558, FK5 610, GCTP 3719.00, Gliese 624, Gl 624, HD 147584, HIC 80686, HIP 80686, HR 6098, LTT 6558, SAO 253554, GC 22089, 2MASS J16282814-7005037, WISEA J162828.62-700502.6, TIC 362747897, TYC 9278-2951-1, Gaia EDR3 5808612830236138368
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Frequently Asked Questions

How far is the Zeta Trianguli Australis system from the Sun?

The Zeta Trianguli Australis system is 39 light years or 12.1 parsecs from the Sun.

What galaxy is the Zeta Trianguli Australis star in?

The Zeta Trianguli Australis is in the Milky Way galaxy just like the Sun.

How many stars are in the Zeta Trianguli Australis system?

The Zeta Trianguli Australis system contains 2 stars.

What type of star is the Zeta Trianguli Australis?

The primary in the Zeta Trianguli Australis system is a Yellow-White star star.

What temperature is star Zeta Trianguli Australis?

The primary in the Zeta Trianguli Australis system has a temperature of 6051 K. Find out more about the temperature of stars in Stellar guide
Closest stars

 Beta Trianguli Australis
 1.6 M☉ 5.3 ly

L 43-72
 - 7.6 ly

DENIS J145407.8-660447
 - 7.7 ly

L 21-3
 - 7.9 ly

PM J14223-7023
 - 7.9 ly
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stellar brief logoStellar Brief

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27. 10. 2026
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V1298 Tau b showed helium absorption during all four observed transits across four years, but its active host star may affect the signal. The latest findings also point to silicate clouds on TOI-561 b, a warped dust ring around CQ Tau, and a giant planet candidate near Boyajian's star that may be surrounded by vast rings. New atmospheric models reveal why gas compositions can vary across hot giant planets.
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