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TOI 198
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Star TOI 198

Red dwarf TOI 198 is located 78 light years away from the Sun. It is a single star of spectral class M0V, that has 47 % of solar mass. There is at least one exoplanet in this system.
Sun distance
78 light years
galaxy map

TOI 198

Red dwarf, High proper motion star
Spectral class: M0V

Location +

Ascension iconRight ascension: 0h 9m 5.189s
Declination iconDeclination: -27° 7' 18.238'' (southern hemisphere)
Parallax iconParallax: 42.059
Distance iconSun distance: 77.547 ly | 23.8 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: 46.7 % M Sun
| 5 M Jupiter
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Star mass
Mass of the star TOI 198 is 0.467 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: 44 % R Sun
| 4.4 R Jupiter
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Star size
Radius of the star TOI 198 is 0.44 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: 3650 K | 0.63 T Sun
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Star temperature
Surface temperature of TOI 198 is 3650 K, which is 63 % 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: 5.3 billions years | 1.15 Sun
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Star age
Star TOI 198 is 5.3 billion years old, which is about 1.15 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): 11.7
Magnitude iconAbsolute magnitude (V): 9.8
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 198 system structure

 TOI 198
TOI 198 b 0.1 AU 1.4 R⊕ 10.2 days
More about TOI 198
Nearby star TOI 198 is a main sequence star that fuses hydrogen atoms into helium. It is approximately 40 % of the size of Sun and temperature on its surface is around 3650 K (3377 °C), which is about 63 % of Sun's temperature.
       TOI 198 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
CD-27 16, Gaia EDR3 2333676738050041728
External sources
icon study
Characterization of a set of small planets with TESS and CHEOPS and an analysis of photometric performance
Scientific study, Accepted: 19. 01. 2023
simbad icon
Simbad database (CD-27 16)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 2333676738050041728)
Archive from the Gaia mission
tess icon
TESS database (TOI 198.01)
Archive from the TESS mission
Class of stars Red dwarf
Red dwarfs are small, relatively cool, reddish stars. They are by far the most common type of star in the solar neighborhood. Their mass typically ranges from about 8% to 50% of the Sun's mass.
Closest stars

 HD 224607
 - 4.6 ly

HD 1815
 - 7.6 ly

BPM 46052
 - 8.1 ly

LP 825-400
 - 8.2 ly

BD-22 6219
 - 8.5 ly
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