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Eta Telescopii B
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Star Eta Telescopii B

Brown dwarf Eta Telescopii B is located 158 light years away from the Sun. It is a single star, that has 3 % of solar mass. For now, there are no known exoplanets in this star system.
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Sun distance
158 light years
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Eta Telescopii B

Brown dwarf

Location +

Distance iconDistance from the primary: 218 AU

Basic characteristic

icon weight
Mass: 3 % M Sun
| 31 M Jupiter
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Star mass
Mass of the star Eta Telescopii B 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: 23 % R Sun
| 2.3 R Jupiter
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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
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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
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Eta Telescopii B 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 B

Eta Telescopii B is approximately 20 % of the size of Sun and temperature on its surface is around 2830 K (2557 °C), which is about 49 % of Sun's temperature.
       Eta Telescopii B can be found in southern celestial hemisphere, however it is too dim to be seen with the naked eye or even a small telescope.
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External sources
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Scientific study, Accepted: 29. 12. 2026
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A Sample of Thick-Disk Stars Hosting Hot Jupiters
Scientific study, Accepted: 16. 10. 2026
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icon study
icon study
icon study
icon study
icon study
icon study
A Spatial Map of the Atmospheric Limb of a Hot Jupiter
Scientific study, Accepted: 14. 10. 2026
icon study

News from this star system

WASP-33 b and other hot Jupiters identified as prime targets for structural studies
iconYesterday
Image: WASP-33 b and other hot Jupiters identified as prime targets for structural studies
WASP-33 b, WASP-76 b, and HAT-P-32 b are identified as the best candidates for studying how stellar gravity shapes exoplanet interiors. Measuring their physical deformation will help reveal their deep, internal density structures using JWST and Ariel data....
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Atmospheric structure of WASP-94 A b revealed through new limb asymmetry method
iconYesterday
Image: Atmospheric structure of WASP-94 A b revealed through new limb asymmetry method
A new analysis of WASP-94 A b reveals a 415 K temperature difference between its morning and evening sides. The evening atmosphere shows signs of H2O, CO2, CO, and H2S, while the morning side remains obscured by aerosols....
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Thick-disk stars identified as hosts to ancient hot jupiter planets
iconYesterday
Image: Thick-disk stars identified as hosts to ancient hot jupiter planets
New analysis of 268 stars identifies several hot Jupiters orbiting ancient stars in the Milky Way's thick disk. These systems, over 8 billion years old, show distinct differences in mass and orbital periods compared to younger thin-disk populations....
Read article tag icon

Frequently Asked Questions

How far is the Eta Telescopii B system from the Sun?

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

What galaxy is the Eta Telescopii B star in?

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

How many stars are in the Eta Telescopii B system?

The Eta Telescopii B is a single star, there are no other known stars in the system.

What type of star is the Eta Telescopii B?

The star Eta Telescopii B is a Brown dwarf star.

What temperature is star Eta Telescopii B?

The star Eta Telescopii B has an effective temperature of 2830 K. Find out more about the temperature of stars in Stellar guide
Class of stars Brown dwarf
Brown dwarfs are not really stars, because there is no thermonuclear fusion in their core. These objects are smaller and cooler than stars, but too massive to be considered planets.
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