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Sigma Ceti
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Star Sigma Ceti

Yellow-White star Sigma Ceti is located 75 light years away from the Sun. It is suspected double or multiple star of spectral class F5V / F4IV, that has 121 % of solar mass. For now, there are no known exoplanets in this star system.
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Sun distance
75 light years
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Sigma Ceti

Yellow-White star
Spectral class: F5V / F4IV

Location +

Ascension iconRight ascension: 2h 32m 5.156s
Declination iconDeclination: -15° 14' 42.642'' (equatorial region)
Parallax iconParallax: 43.378
Distance iconSun distance: 75.190 ly | 23.1 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: 121 % M Sun
| 1268 M Jupiter
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Star mass
Mass of the star Sigma Ceti is 1.21 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: 150 % R Sun
| 14.9 R Jupiter
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Star size
Radius of the star Sigma Ceti is 1.5 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: 6527 K | 1.13 T Sun
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Star temperature
Surface temperature of Sigma Ceti is 6527 K, which is 113 % 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: 2.135 billions years | 0.46 Sun
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Star age
Star Sigma Ceti is 2.135 billion years old, which is about 0.46 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: 7.6 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

Photometry

Magnitude iconApparent magnitude (V): 4.8
Magnitude iconAbsolute magnitude (V): 3
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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Sigma Ceti system structure

 Sigma Ceti

More about Sigma Ceti

Nearby star Sigma Ceti is a main sequence star that fuses hydrogen atoms into helium. It is is approximately 50 % bigger than the Sun and temperature on its surface is around 6527 K (6254 °C), which is about 113 % of Sun's temperature.
       Sigma Ceti can be found in southern celestial hemisphere, and it is possible to see it with naked eye. The star is also observable from Northern America, Europe and Asia.
Other designations of this star
σ Cet, 76 Cet, BD−15° 449, FK5 1071, HD 15798, HIP 11783, HR 740, SAO 148445, * sig Cet , Gaia EDR3 5145955421492456960
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External sources
simbad icon
Simbad database (* sig Cet)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 5145955421492456960)
Archive from the Gaia mission

Frequently Asked Questions

How far is the Sigma Ceti system from the Sun?

The Sigma Ceti system is 75 light years or 23.1 parsecs from the Sun.

What galaxy is the Sigma Ceti star in?

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

How many stars are in the Sigma Ceti system?

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

What type of star is the Sigma Ceti?

The star Sigma Ceti is a Yellow-White star star.

What temperature is star Sigma Ceti?

The star Sigma Ceti has an effective temperature of 6527 K. Find out more about the temperature of stars in Stellar guide
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3D map of stellar neighborhood
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stellar brief logoStellar Brief

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30. 10. 2026
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The early architecture of planetary systems may be set at birth: a study of Sun-like stars found similar rates of star-planet misalignment across different stages of development. Other findings trace how water and carbon dioxide ice fade around young stars, why white-dwarf debris resists breaking into tiny pieces, and why a reported planet around Gliese 48 remains unconfirmed.
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