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TOI 199
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Star TOI 199

Binary star TOI 199 is located 332 light years away from the Sun. It consists of a yellow star and a red dwarf. There are multiple known exoplanets in this system.
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Sun distance
332 light years
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TOI 199 A

Yellow star
Spectral class: G9V

Location +

Ascension iconRight ascension: 5h 20m 25.417s
Declination iconDeclination: -59° 53' 43.528'' (southern hemisphere)
Parallax iconParallax: 9.830
Distance iconSun distance: 331.809 ly | 101.7 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: 93.6 % M Sun
| 981 M Jupiter
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Star mass
Mass of the star TOI 199 A is 0.936 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: 82 % R Sun
| 8.2 R Jupiter
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Star size
Radius of the star TOI 199 A is 0.82 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: 5255 K | 0.91 T Sun
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Star temperature
Surface temperature of TOI 199 A is 5255 K, which is 91 % 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: 0.8 billions years | 0.17 Sun
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Star age
Star TOI 199 A is 0.8 billion years old, which is about 0.17 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: 0.459 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): 10.7
Magnitude iconAbsolute magnitude (V): 5.7
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

TOI 199 B

Red dwarf

Location +

Distance iconDistance from the primary: 1016 AU

Basic characteristic

icon weight
Mass: 20 % M Sun
| 980.5 M Jupiter
(estimate)
Array
temperature iconTemperature: 5200 K
 (estimate)
+
Star temperature
Surface temperature of TOI 199 B is estimated to be 5232 K, which is 90 % 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

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 199 system structure

 TOI 199 A
TOI 199 A b 0.48 AU 54 M⊕ 9.1 R⊕ 104.9 days
TOI 199 A c 0.81 AU 89 M⊕ 273.7 days
TOI 199 B 1016 AU

More about TOI 199

       TOI 199 can be found in southern celestial hemisphere, you cannot see it with naked eye, but you can observe this star with basic telescope.
Other designations of this star
CD-60 1144, TIC 309792357, TOI-199, 2MASS J05202531-5953443, TYC 8530-77-1, RAVE J052025.3-595344, Gaia DR3 4762582895440787712
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External sources
icon study
Methane on the temperate exo-Saturn TOI-199b
Scientific study, Accepted: 19. 11. 2025
icon study

Frequently Asked Questions

How far is the TOI 199 system from the Sun?

The TOI 199 system is 332 light years or 101.7 parsecs from the Sun.

What galaxy is the TOI 199 star in?

The TOI 199 is in the Milky Way galaxy just like the Sun.

How many stars are in the TOI 199 system?

The TOI 199 system contains 2 stars.

What type of star is the TOI 199?

The primary in the TOI 199 system is a Yellow star star.

What temperature is star TOI 199?

The primary in the TOI 199 system has a temperature of 5255 K. Find out more about the temperature of stars in Stellar guide
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