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TOI-251
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Star TOI-251

Orange star TOI-251 is located 326 light years away from the Sun. It is a single star of spectral class K0 E, that has 104 % of solar mass. There is at least one exoplanet in this system.
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Sun distance
326 light years
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TOI-251

Orange star
Spectral class: K0 E

Location +

Ascension iconRight ascension: 23h 32m 14.840s
Declination iconDeclination: -37° 15' 21.136'' (southern hemisphere)
Parallax iconParallax: 10.019
Distance iconSun distance: 325.528 ly | 99.8 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: 103.6 % M Sun
| 1085 M Jupiter
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Star mass
Mass of the star TOI-251 is 1.036 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: 88 % R Sun
| 8.8 R Jupiter
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Star size
Radius of the star TOI-251 is 0.881 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: 5875 K | 1.02 T Sun
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Star temperature
Surface temperature of TOI-251 is 5875 K, which is 102 % 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: 0.18 billions years | 0.04 Sun
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Star age
Star TOI-251 is 0.18 billion years old, which is about 0.04 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): 9.9
Magnitude iconAbsolute magnitude (V): 4.9
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-251 system structure

 TOI-251
TOI-251 b 0.06 AU 317.9 M⊕ 2.7 R⊕ 4.9 days

More about TOI-251

Star TOI-251 is approximately 90 % of the size of Sun and temperature on its surface is around 5875 K (5602 °C), which is about 102 % of Sun's temperature.
       TOI-251 can be found in southern celestial hemisphere, you cannot see it with naked eye, but you can observe this star with basic telescope. The star is also observable from Northern America, Europe and Asia.
Other designations of this star
CD-37 15287, SAO 214606, TIC 224225541, TYC 7520-369-1, GSC 07520-00369
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External sources
icon study
tess icon
TESS database (TOI 251.01)
Archive from the TESS mission

Frequently Asked Questions

How far is the TOI-251 system from the Sun?

The TOI-251 system is 326 light years or 99.8 parsecs from the Sun.

What galaxy is the TOI-251 star in?

The TOI-251 is in the Milky Way galaxy just like the Sun.

How many stars are in the TOI-251 system?

The TOI-251 is a single star, there are no other known stars in the system.

What type of star is the TOI-251?

The star TOI-251 is a Orange star star.

What temperature is star TOI-251?

The star TOI-251 has an effective temperature of 5875 K. Find out more about the temperature of stars in Stellar guide

stellar brief logoStellar Brief

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24. 10. 2026
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A planet’s helium atmosphere streams ahead of its orbit, while infrared observations reveal the hidden rhythms of its star. New work also shows how neutron-star tilt can reshape X-ray light, traces the past of massive blue supergiants, and maps cloudy and clear zones on the hot Jupiter WASP-43 b.
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