Temperature
5334 K
5334 to 5456
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Stellar HostProfile
K2-157
G9 V • 298.4 pc
Records
5
literature rows
Planets
3
system count
References
6
distinct source labels
TIC: TIC 349445372
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: Castro-González et al. 2025 • System source: TICv8
Mass
0.89 Msun
0.89 to 0.94
Radius
0.86 Rsun
0.86 to 0.92
Age
8.80 Gyr
single adopted value
Distance
298.4 pc
single adopted value
Spectral Type
G9 V
Consistent across records
Planets
3
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 0.86 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
K2-157
0.86 R☉
System Layout
Known planets
3 planets linked to this host
K2-157 and Its Three Planets
K2-157 is a G9 V star located 973 light-years away, with three planets known to orbit it. It is a main-sequence dwarf with a mass of 0.89 solar masses, a radius of 0.86 solar radii, a temperature of 5330 K, and an age of 8.8 billion years. Its mass and radius are smaller than the Sun's, and its temperature is cooler.
K2-157 b was found by the transit method in 2018. It is a Sub-Earth with a mass of 1.14 Earth masses and a radius of 0.935 Earth radii, orbiting every 0.365 days, the shortest period among the listed planets. Its mean density is 7.68 g/cm³, 1.39 times Earth's.
K2-157 c and K2-157 d were both discovered in 2025 by the radial velocity method, which measures the wobble a planet's gravity induces in its star's motion. K2-157 c has a minimum mass of 30.8 Earth masses and an orbital period of 25.9 days, the second-shortest among the listed planets. K2-157 d has a minimum mass of 23.3 Earth masses and an orbital period of 66.5 days, the longest among the listed planets. Both minimum masses are larger than Earth's.
Provenance
Underlying measurements and references
Evidence Summary
Rows
5
Stellar refs
5
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Agestable
Luminositydisputed
Surface Gravitydisputed
Metallicitydisputed
Spectral Typestable
| ST TEFF | ST MASS | ST RAD | ST AGE | ST LUM | ST SPECTYPE | SY DIST | Stellar Ref | System Ref |
|---|---|---|---|---|---|---|---|---|
| 5456 | 0.94 | 0.88 | — | — | — | 298.4 | Mayo et al. 2018 | TICv8 |
| 5456 | — | 0.88 | — | — | — | 298.4 | Adams et al. 2021 | TICv8 |
| 5334 | 0.89 | 0.86 | 8.80 | — | G9 V | 298.4 | Castro-González et al. 2025 | TICv8 |
| 5377 | 0.93 | 0.92 | — | -0.19 | — | 298.4 | TICv8 | TICv8 |
| 5337 | — | 0.92 | — | -0.21 | — | 298.4 | Gaia DR2 | TICv8 |