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TOI-210
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Star TOI-210

Red dwarf TOI-210 is located 139 light years away from the Sun. It is a single star of spectral class M4V, that has 31 % of solar mass. There is at least one exoplanet in this system.
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Sun distance
139 light years
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TOI-210

Red dwarf
Spectral class: M4V

Location +

Ascension iconRight ascension: 5h 55m 50.859s
Declination iconDeclination: -73° 59' 7.106'' (southern hemisphere)
Parallax iconParallax: 23.485
Distance iconSun distance: 138.881 ly | 42.6 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: 31 % M Sun
| 325 M Jupiter
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Star mass
Mass of the star TOI-210 is 0.31 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: 33 % R Sun
| 3.3 R Jupiter
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Star size
Radius of the star TOI-210 is 0.329 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: 3200 K | 0.55 T Sun
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Star temperature
Surface temperature of TOI-210 is 3200 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: 4.5 billions years | 0.98 Sun
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Star age
Star TOI-210 is 4.5 billion years old, which is about 0.98 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: 0.011 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): 15.4
Magnitude iconAbsolute magnitude (V): 12.2
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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TOI-210 system structure

 TOI-210
TOI-210 b 0.06 AU 6.8 M⊕ 2.2 R⊕ 9 days

More about TOI-210

Star TOI-210 is approximately 30 % of the size of Sun and temperature on its surface is around 3200 K (2927 °C), which is about 55 % of Sun's temperature.
       TOI-210 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
TOI 210, TIC 141608198, 2MASS J05555049-7359046, Gaia DR3 4650160717726370816, Gaia DR3 4650160717726370816
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External sources
icon study
gaia icon
Gaia database (Gaia DR3 4650160717726370816)
Archive from the Gaia mission

News from this star system

Temperate sub-Neptune planet orbiting the red dwarf star TOI-210 confirmed
Image: Temperate sub-Neptune planet orbiting the red dwarf star TOI-210 confirmed
A temperate sub-Neptune planet, TOI-210 b, has been confirmed orbiting the red dwarf TOI-210. With 6.75 times Earth's mass, the planet is likely a water-rich world or a gas dwarf. Evidence also points to two additional planets in the system....
29.9.2026
Read article >

Frequently Asked Questions

How far is the TOI-210 system from the Sun?

The TOI-210 system is 139 light years or 42.6 parsecs from the Sun.

What galaxy is the TOI-210 star in?

The TOI-210 is in the Milky Way galaxy just like the Sun.

How many stars are in the TOI-210 system?

The TOI-210 is a single star, there are no other known stars in the system.

What type of star is the TOI-210?

The star TOI-210 is a Red dwarf star.

What temperature is star TOI-210?

The star TOI-210 has an effective temperature of 3200 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.
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