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CI Tauri
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Star CI Tauri

T Tauri star CI Tauri is located 523 light years away from the Sun. It is a single star of spectral class K4IVe, that has 90 % of solar mass. There are multiple known exoplanets in this system.
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Sun distance
523 light years
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CI Tauri

T Tauri star
Spectral class: K4IVe

Location +

Ascension iconRight ascension: 4h 33m 52.033s
Declination iconDeclination: 22° 50' 29.821'' (northern hemisphere)
Parallax iconParallax: 6.238
Distance iconSun distance: 522.886 ly | 160.3 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: 90 % M Sun
| 943 M Jupiter
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Star mass
Mass of the star CI Tauri is 0.90 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: 168 % R Sun
| 16.7 R Jupiter
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Star size
Radius of the star CI Tauri is 1.679 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
time icon
Age: 0.002 billions years | 0 Sun
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Star age
Star CI Tauri is 0.002 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: 0.1 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): 13.8
Magnitude iconAbsolute magnitude (V): 7.8
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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CI Tauri system structure

 CI Tauri
CI Tauri b n/a 3687.7 M⊕ 9 days
CI Tauri c 0.17 AU 1144.5 M⊕ 25.2 days

More about CI Tauri

       CI Tauri can be found in northern celestial hemisphere, however it is too dim to be seen with the naked eye or even a small telescope.
Other designations of this star
CI Tau, 2MASS J04335200+2250301, EPIC 247584113, Haro 6-25, TIC 61230756, WISE J043352.01+225030.0, Gaia DR3 145203159127518336
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External sources
icon study
Azimuthal brightness modulation reveals hidden rings in CI Tau
Scientific study, Accepted: 02. 07. 2026
icon study
icon study
icon study
icon study
icon study
gaia icon
Gaia database (Gaia DR3 145203159127518336)
Archive from the Gaia mission

Frequently Asked Questions

How far is the CI Tauri system from the Sun?

The CI Tauri system is 523 light years or 160.3 parsecs from the Sun.

What galaxy is the CI Tauri star in?

The CI Tauri is in the Milky Way galaxy just like the Sun.

How many stars are in the CI Tauri system?

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

What type of star is the CI Tauri?

The star CI Tauri is a T Tauri star star.

What temperature is the CI Tauri?

The primary in the CI Tauri system has an effective temperature of K ( °C). Find out more about the temperature of stars in Stellar guide
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