Temperature
3650 K
3650 to 3801
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Stellar HostProfile
TOI-198
M0 V • 23.73 pc
Records
7
literature rows
Planets
1
system count
References
8
distinct source labels
TIC: TIC 12421862HIP: HIP 738
Approximate color
from effective temperature
Canonical Summary
Adopted host values from one source row
Values come from the row with the most populated summary measurements. Missing values stay missing. Ranges and counts describe all source rows.
Stellar source: Oddo et al. 2023 • System source: TICv8
Mass
0.47 Msun
0.41 to 0.47
Radius
0.44 Rsun
0.42 to 0.45
Age
5.30 Gyr
1 to 5.30
Distance
23.73 pc
single adopted value
Spectral Type
M0 V
Multiple classifications reported
Planets
1
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 0.44 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
TOI-198
0.44 R☉
System Layout
Known planets
1 planets linked to this host
TOI-198 b
Transit
◌
Discovery
2023
Period
10.22 days
Radius
1.36 R⊕
Mass
3.17 M⊕
Eq. Temp
456 K
TOI-198 b: An Earth-Like World Around a Cool Red Dwarf
TOI-198 is a single star 77.4 light-years away with one known planet. The host is an M0 V star, a small, cool red dwarf with 0.467 solar masses, 0.441 solar radii, and a temperature of 3650 K, making it less massive, less bulky, and cooler than the Sun. It is 5.3 billion years old.
The planet, TOI-198 b, was discovered in 2023 via the transit method, in which a planet crosses in front of its star from our viewpoint and causes a small dip in observed brightness. It is an Earth-like world, meaning its radius falls within 1.5 times Earth's radius. Its radius is 1.36 Earth radii, larger than Earth's, and its mass is 3.17 Earth masses, also larger than Earth's. Its mean density is 6.94 g/cm³, 1.26 times Earth's. It completes an orbit every 10.2 days.
Provenance
Underlying measurements and references
Evidence Summary
Rows
7
Stellar refs
7
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Agedisputed
Luminositydisputed
Surface Gravitydisputed
Metallicitydisputed
Spectral Typedisputed
| ST TEFF | ST MASS | ST RAD | ST AGE | ST LUM | ST SPECTYPE | SY DIST | Stellar Ref | System Ref |
|---|---|---|---|---|---|---|---|---|
| 3801 | 0.42 | 0.42 | 1 | -1.48 | — | 23.73 | Zapatero Osorio et al. 2026 | TICv8 |
| — | — | — | — | — | M0 V | 23.73 | Gray et al. 2006 | TICv8 |
| 3763 | — | 0.45 | — | — | — | 23.73 | ExoFOP | TICv8 |
| 3783 | 0.41 | 0.42 | — | -1.52 | — | 23.73 | Turnbull 2015 | TICv8 |
| 3650 | 0.47 | 0.44 | 5.30 | — | M0 V | 23.73 | Oddo et al. 2023 | TICv8 |
| — | — | — | — | — | M0 | 23.73 | Hawley et al. 1996 | TICv8 |
| 3782 | 0.44 | 0.45 | — | -1.43 | — | 23.73 | TICv8 | TICv8 |