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TOI-2257
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Star TOI-2257

TOI-2257 is a Red dwarf star located approximately 189 light-years from the Sun. It has a mass of 0.33 solar masses and a radius of 0.311 solar radii, with a surface temperature of approximately 3430 Kelvin.
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Sun distance
189 light years
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TOI-2257

Red dwarf
Spectral class: M3

Location +

Ascension iconRight ascension: 12h 58m 57.510s
Declination iconDeclination: 77° 39' 42.180'' (northern hemisphere)
Parallax iconParallax: 17.275
Distance iconSun distance: 188.805 ly | 57.9 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: 33 % M Sun
| 346 M Jupiter
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Star mass
Mass of the star TOI-2257 is 0.33 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: 31 % R Sun
| 3.1 R Jupiter
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Star size
Radius of the star TOI-2257 is 0.311 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: 3430 K | 0.59 T Sun
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Star temperature
Surface temperature of TOI-2257 is 3430 K, which is 59 % 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

Photometry

Magnitude iconApparent magnitude (V): 15.2
Magnitude iconAbsolute magnitude (V): 11.4
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-2257 system structure

 TOI-2257
TOI-2257 b 0.15 AU (HZ) 5.7 M⊕ 2.2 R⊕ 35.2 days

More about TOI-2257

Star TOI-2257 is approximately 30 % of the size of Sun and temperature on its surface is around 3430 K (3157 °C), which is about 59 % of Sun's temperature.
       TOI-2257 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
TIC 198485881
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External sources
icon study
tess icon
TESS database (TOI 2257.01)
Archive from the TESS mission

Frequently Asked Questions

How far is the TOI-2257 system from the Sun?

The TOI-2257 system is 189 light years or 57.9 parsecs from the Sun.

What galaxy is the TOI-2257 star in?

The TOI-2257 is in the Milky Way galaxy just like the Sun.

How many stars are in the TOI-2257 system?

The TOI-2257 is a single star, there are no other known stars in the system.

What type of star is the TOI-2257?

The star TOI-2257 is a Red dwarf star.

What temperature is star TOI-2257?

The star TOI-2257 has an effective temperature of 3430 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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