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Eta Telescopii
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Star Eta Telescopii

Triple star system Eta Telescopii is located 158 light years away from the Sun. It is a system with 3 stars. There is at least one exoplanet in this system.
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Sun distance
158 light years
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Eta Telescopii A

White-Blue star
Spectral class: A0 Vn

Location +

Ascension iconRight ascension: 19h 22m 51.262s
Declination iconDeclination: -54° 25' 27.473'' (southern hemisphere)
Parallax iconParallax: 20.603
Distance iconSun distance: 158.307 ly | 48.5 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: 324 % M Sun
| 3394 M Jupiter
+
Star mass
Mass of the star Eta Telescopii A is 3.24 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: 161 % R Sun
| 16 R Jupiter
+
Star size
Radius of the star Eta Telescopii A is 1.61 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: 11941 K | 2.07 T Sun
+
Star temperature
Surface temperature of Eta Telescopii A is 11941 K, which is 207 % 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: 0.012 billions years | 0 Sun
+
Star age
Star Eta Telescopii A is 0.012 billion years old, which is about 0 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: 24 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 iconAbsolute magnitude (V): -3.4
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

Eta Telescopii B

Brown dwarf

Location +

Distance iconDistance from the primary: 218 AU

Basic characteristic

icon weight
Mass: 3 % M Sun
| 31 M Jupiter
+
Star mass
Mass of the star Eta Telescopii B is 3.24 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: 23 % R Sun
| 2.3 R Jupiter
+
Star size
Radius of the star Eta Telescopii B is 0.234 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: 2830 K | 0.49 T Sun
+
Star temperature
Surface temperature of Eta Telescopii B is 2830 K, which is 49 % 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

HD 181327

Yellow-White star
Spectral class: F5/6

Basic characteristic

icon weight
Mass: 139 % M Sun
| 1456 M Jupiter
+
Star mass
Mass of the star HD 181327 is 0.03 solar masses (or 31.4 Jupiter 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: 132 % R Sun
| 13.1 R Jupiter
+
Star size
Radius of the star HD 181327 is 1.32 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: 6498 K | 1.12 T Sun
+
Star temperature
Surface temperature of HD 181327 is 6498 K, which is 112 % 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: 0.025 billions years | 0.01 Sun
+
Star age
Star HD 181327 is 0.025 billion years old, which is about 0.01 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: 0.44 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 iconAbsolute magnitude (V): -3.4
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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Eta Telescopii system structure

 Eta Telescopii A
Eta Telescopii B 218 AU
HD 181327
HD 181327 Disk 83 AU -
HD 181327 b
unconfirmed
 84 AU 635.8 M⊕ -

More about Eta Telescopii

       Eta Telescopii can be found in southern celestial hemisphere, and it is possible to see it with naked eye.
Other designations of this star
η Tel, Eta Tel, CPD−54° 9339, HD 181296, HIP 95261, HR 7329, SAO 246055, Gaia DR3 6643602576214115584
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External sources
icon study
Water ice in the debris disk around HD 181327
Scientific study, Accepted: 13. 05. 2025
icon study
icon study
Gas absorption towards the eta Tel debris disc: winds or clouds?
Scientific study, Accepted: 14. 09. 2023
gaia icon
Gaia database (Gaia DR3 6643589352010758400)
Archive from the Gaia mission

Frequently Asked Questions

How far is the Eta Telescopii system from the Sun?

The Eta Telescopii system is 158 light years or 48.5 parsecs from the Sun.

What galaxy is the Eta Telescopii star in?

The Eta Telescopii is in the Milky Way galaxy just like the Sun.

How many stars are in the Eta Telescopii system?

The Eta Telescopii system contains 3 stars.

What type of star is the Eta Telescopii?

The primary in the Eta Telescopii system is a White-Blue star star.

What temperature is star Eta Telescopii?

The primary in the Eta Telescopii system has a temperature of 11941 K. Find out more about the temperature of stars in Stellar guide
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