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Sigma Octantis
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Star Sigma Octantis

Yellow giant Sigma Octantis is located 294 light years away from the Sun. It is a single star of spectral class F0 III, that has 159 % of solar mass. For now, there are no known exoplanets in this star system.
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Sun distance
294 light years
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Sigma Octantis

Yellow giant
Spectral class: F0 III

Location +

Ascension iconRight ascension: 21h 8m 46.864s
Declination iconDeclination: -88° 57' 23.398'' (southern hemisphere)
Parallax iconParallax: 11.101
Distance iconSun distance: 293.821 ly | 90.1 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: 159 % M Sun
| 1666 M Jupiter
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Star mass
Mass of the star Sigma Octantis is 1.59 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: 432 % R Sun
| 43 R Jupiter
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Star size
Radius of the star Sigma Octantis is 4.32 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: 7415 K | 1.28 T Sun
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Star temperature
Surface temperature of Sigma Octantis is 7415 K, which is 128 % 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: 0.912 billions years | 0.2 Sun
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Star age
Star Sigma Octantis is 0.912 billion years old, which is about 0.2 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: 43 L Sun
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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
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Sigma Octantis system structure

 Sigma Octantis

More about Sigma Octantis

Star Sigma Octantis is is approximately 4 times bigger than the Sun and temperature on its surface is around 7415 K (7142 °C), which is about 128 % of Sun's temperature.
       Sigma Octantis can be found in southern celestial hemisphere.
Other designations of this star
Polaris Australis, σ Oct, CPD−89°47, FK5 923, HD 177482, HIC 104382, HIP 104382, HR 7228, SAO 258857
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Frequently Asked Questions

How far is the Sigma Octantis system from the Sun?

The Sigma Octantis system is 294 light years or 90.1 parsecs from the Sun.

What galaxy is the Sigma Octantis star in?

The Sigma Octantis is in the Milky Way galaxy just like the Sun.

How many stars are in the Sigma Octantis system?

The Sigma Octantis is a single star, there are no other known stars in the system.

What type of star is the Sigma Octantis?

The star Sigma Octantis is a Yellow giant star.

What temperature is star Sigma Octantis?

The star Sigma Octantis has an effective temperature of 7415 K. Find out more about the temperature of stars in Stellar guide
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