Temperature
4621 K
4469.5 to 4730.8
←Back to Stellar Hosts
Stellar HostProfile
K2-128
Unclassified star • 114.6 pc
Records
5
literature rows
Planets
1
system count
References
6
distinct source labels
TIC: TIC 677945
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: Mayo et al. 2018 • System source: TICv8
Mass
0.69 Msun
0.69 to 0.71
Radius
0.65 Rsun
0.58 to 0.78
Distance
114.6 pc
single adopted value
Planets
1
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 0.65 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
K2-128
0.65 R☉
System Layout
Known planets
1 planets linked to this host
K2-128 b
Transit
◌
Discovery
2017
Period
5.68 days
Radius
1.42 R⊕
Mass
—
Eq. Temp
—
K2-128 and Its Solitary Known Planet
K2-128 is a star 374 light-years away with a mass of 0.687 solar masses and a radius of 0.651 solar radii, both smaller than the Sun's. Its temperature of 4620 K is cooler than the Sun's. One planet is known to orbit this host: K2-128 b.
K2-128 b was discovered by transit in 2017. Its radius of 1.42 Earth radii is larger than Earth's, placing it within the Earth-like size class, which covers planets up to 1.5 times Earth's radius. It completes an orbit every 5.68 days.
Provenance
Underlying measurements and references
Evidence Summary
Rows
5
Stellar refs
5
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Luminositydisputed
Surface Gravitydisputed
Metallicitystable
| ST TEFF | ST MASS | ST RAD | ST AGE | ST LUM | ST SPECTYPE | SY DIST | Stellar Ref | System Ref |
|---|---|---|---|---|---|---|---|---|
| 4469.5 | 0.71 | 0.78 | — | — | — | 114.6 | Dressing et al. 2017 | TICv8 |
| 4621 | 0.69 | 0.65 | — | — | — | 114.6 | Mayo et al. 2018 | TICv8 |
| — | — | 0.58 | — | — | — | 114.6 | Kruse et al. 2019 | TICv8 |
| 4470 | 0.70 | 0.69 | — | -0.77 | — | 114.6 | TICv8 | TICv8 |
| 4730.8 | — | 0.58 | — | -0.82 | — | 114.6 | Gaia DR2 | TICv8 |