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TOI 771
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Star TOI 771

Red dwarf TOI 771 is located 83 light years away from the Sun. It is a single star of spectral class M3, that has 22 % of solar mass. There are multiple known exoplanets in this system.
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Sun distance
83 light years
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TOI 771

Red dwarf, High proper motion star
Spectral class: M3

Location +

Ascension iconRight ascension: 10h 56m 27.343s
Declination iconDeclination: -72° 59' 6.663'' (southern hemisphere)
Parallax iconParallax: 39.447
Distance iconSun distance: 82.683 ly | 25.4 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: 22 % M Sun
| 230 M Jupiter
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Star mass
Mass of the star TOI 771 is 0.22 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: 24 % R Sun
| 2.4 R Jupiter
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Star size
Radius of the star TOI 771 is 0.242 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: 3201 K | 0.55 T Sun
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Star temperature
Surface temperature of TOI 771 is 3201 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: 6.7 billions years | 1.46 Sun
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Star age
Star TOI 771 is 6.7 billion years old, which is about 1.46 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: 0.0055 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): 14.9
Magnitude iconAbsolute magnitude (V): 12.9
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 771 system structure

 TOI 771
TOI 771 b 0.02 AU 2.5 M⊕ 1.4 R⊕ 2.3 days
TOI 771 c 0.05 AU 2.9 M⊕ 7.6 days

More about TOI 771

Nearby star TOI 771 is approximately 20 % of the size of Sun and temperature on its surface is around 3201 K (2928 °C), which is about 55 % of Sun's temperature.
       TOI 771 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
UCAC4 086-023421, TIC 277634430, 2MASS J10562716-7259054, Gaia EDR3 5229384714547758720
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External sources
icon study
icon study
simbad icon
Simbad database (UCAC4 086-023421)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 5229384714547758720)
Archive from the Gaia mission
tess icon
TESS database (TOI 771.01)
Archive from the TESS mission

Frequently Asked Questions

How far is the TOI 771 system from the Sun?

The TOI 771 system is 83 light years or 25.4 parsecs from the Sun.

What galaxy is the TOI 771 star in?

The TOI 771 is in the Milky Way galaxy just like the Sun.

How many stars are in the TOI 771 system?

The TOI 771 is a single star, there are no other known stars in the system.

What type of star is the TOI 771?

The star TOI 771 is a Red dwarf star.

What temperature is star TOI 771?

The star TOI 771 has an effective temperature of 3201 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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