Temperature
5367 K
5289 to 5367
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Stellar HostProfile
K2-388
G8 • 290.5 pc
Records
5
literature rows
Planets
1
system count
References
6
distinct source labels
TIC: TIC 49735922
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: Zink et al. 2021 • System source: TICv8
Mass
0.84 Msun
0.84 to 0.93
Radius
0.90 Rsun
0.90 to 0.93
Distance
290.5 pc
single adopted value
Spectral Type
G8
Consistent across records
Planets
1
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 0.90 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
K2-388
0.90 R☉
System Layout
Known planets
1 planets linked to this host
K2-388 b
Transit
◌
Discovery
2022
Period
6.34 days
Radius
3.90 R⊕
Mass
—
Eq. Temp
874 K
K2-388 b: A Neptune-Like Planet in a Distant Star System
K2-388 is a G8 star located 947 light-years from Earth. Its spectral type places it among the cooler G-type stars. The star has a measured mass of 0.842 solar masses and a radius of 0.897 solar radii, making it somewhat smaller than the Sun. Its temperature is 5370 K, which is cooler than the Sun's.
One known planet orbits this host: K2-388 b. It is classified as Neptune-like, meaning its radius falls within the range where a planet reaches up to 4 times Earth's radius. K2-388 b has a reported radius of 3.9 Earth radii, larger than Earth's. The planet was discovered by the transit method in 2022, when it passed in front of its star and caused a small dip in observed brightness. Such repeated dips help establish its orbital period, which is 6.34 days.
Provenance
Underlying measurements and references
Evidence Summary
Rows
5
Stellar refs
5
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Luminositystable
Surface Gravitydisputed
Metallicitydisputed
Spectral Typestable
| ST TEFF | ST MASS | ST RAD | ST AGE | ST LUM | ST SPECTYPE | SY DIST | Stellar Ref | System Ref |
|---|---|---|---|---|---|---|---|---|
| 5310 | 0.93 | 0.91 | — | — | — | 290.5 | Howard et al. 2025 | TICv8 |
| 5289 | 0.91 | 0.93 | — | -0.21 | — | 290.5 | TICv8 | TICv8 |
| 5289 | — | 0.93 | — | — | — | 290.5 | ExoFOP | TICv8 |
| 5367 | 0.84 | 0.90 | — | — | G8 | 290.5 | Zink et al. 2021 | TICv8 |
| 5367 | 0.84 | 0.90 | — | — | — | 290.5 | Christiansen et al. 2022 | TICv8 |