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YZ Ceti
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Star YZ Ceti

Red dwarf YZ Ceti is located 12 light years away from the Sun. It is a single flare star of spectral class M4 Ve, that has 13 % of solar mass. There are multiple known exoplanets in this system.
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Sun distance
12 light years
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YZ Ceti

Red dwarf, flare star
Spectral class: M4 Ve

Location +

Ascension iconRight ascension: 1h 12m 31.986s
Declination iconDeclination: -16° 59' 46.158'' (equatorial region)
Parallax iconParallax: 269.057
Distance iconSun distance: 12.122 ly | 3.7 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: 13 % M Sun
| 136 M Jupiter
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Star mass
Mass of the star YZ Ceti is 0.13 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: 16.8 % R Sun
| 1.7 R Jupiter
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Star size
Radius of the star YZ Ceti is 0.168 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: 3151 K | 0.55 T Sun
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Star temperature
Surface temperature of YZ Ceti is 3151 K, which is 55 % 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: 5 billions years | 1.09 Sun
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Star age
Star YZ Ceti is 5 billion years old, which is about 1.09 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): 12.1
Magnitude iconAbsolute magnitude (V): 14.2
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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YZ Ceti system structure

 YZ Ceti
YZ Ceti b 0.02 AU 0.7 M⊕ 2 days
YZ Ceti c 0.02 AU 1 M⊕ 3.1 days
YZ Ceti d 0.03 AU 1.1 M⊕ 4.7 days

More about YZ Ceti

Nearby star YZ Ceti is a main sequence star that fuses hydrogen atoms into helium. It is approximately 20 % of the size of Sun and temperature on its surface is around 3151 K (2878 °C), which is about 55 % of Sun's temperature.
       YZ Ceti can be found in southern celestial hemisphere, however it is too dim to be seen with the naked eye or even a small telescope.
Other designations of this star
GCTP 248.01, Gliese 54.1, GJ 54.1, G 268-135, LHS 138, LTT 670, L 725-32, HIP 5643, YZ Cet, Gaia EDR3 2358524597030794112
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External sources
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simbad icon
Simbad database (V* YZ Cet)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 2358524597030794112)
Archive from the Gaia mission

Frequently Asked Questions

How far is the YZ Ceti system from the Sun?

The YZ Ceti system is 12 light years or 3.7 parsecs from the Sun.

What galaxy is the YZ Ceti star in?

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

How many stars are in the YZ Ceti system?

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

What type of star is the YZ Ceti?

The star YZ Ceti is a Red dwarf star.

What temperature is star YZ Ceti?

The star YZ Ceti has an effective temperature of 3151 K. Find out more about the temperature of stars in Stellar guide
Class of stars Red dwarf
Red dwarfs are small, cool stars with surface temperatures of about 2,000–3,800 K, much cooler than the Sun. They usually have 8–50% of the Sun’s mass and shine very faintly, sometimes at just a tiny fraction of the Sun’s brightness. Classified mainly as spectral type M, they are the most common stars in the Milky Way, making up roughly 70–75% of its stellar population.

They fuse hydrogen slowly through the proton–proton chain and are fully convective, which allows them to use their fuel very efficiently. As a result, red dwarfs can live for tens of billions to trillions of years—far longer than the Sun. Many exoplanets orbit red dwarfs, including some in close habitable zones, though strong stellar activity can affect planetary environments.
Closest stars

 Tau Ceti
 0.69 M☉ 1.6 ly

Luyten 726-8
 0.12 M☉ 3.5 ly

Gliese 1005
 0.18 M☉ 5.3 ly

Van Maanens star
 0.68 M☉ 5.6 ly

Gliese 1002
 0.11 M☉ 5.8 ly
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