Temperature
4870 K
4779 to 5147
←Back to Stellar Hosts
Stellar HostProfile
K2-8
K3 V • 403.5 pc
Records
9
literature rows
Planets
2
system count
References
9
distinct source labels
TIC: TIC 38114658
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: Sinukoff et al. 2016 • System source: TICv8
Mass
0.78 Msun
0.77 to 0.84
Radius
0.74 Rsun
0.71 to 0.80
Distance
403.5 pc
single adopted value
Spectral Type
K3 V
Consistent across records
Planets
2
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 0.74 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
K2-8
0.74 R☉
System Layout
Known planets
2 planets linked to this host
K2-8: A K-Type Dwarf with Two Transiting Planets
K2-8 is a K3 V star, a cooler, main-sequence dwarf, located 1320 light-years away. Its mass is 0.78 solar masses and its radius is 0.74 solar radii, both smaller than the Sun's, and its temperature of 4870 K is cooler than the Sun's. Two planets have been found orbiting this host.
K2-8 b is a Neptune-like planet discovered by transit in 2015. It has a radius of 3.58 Earth radii, larger than Earth's, and an orbital period of 10.4 days. K2-8 c is a Super-Earth discovered by transit in 2016, with a radius of 2.41 Earth radii, also larger than Earth's, and an orbital period of 5.06 days. Among the listed planets, K2-8 c has the shortest year, at 5.06 days, and the smallest radius, at 2.41 Earth radii; K2-8 b has the longest year, at 10.4 days, and the largest radius, at 3.58 Earth radii.
Provenance
Underlying measurements and references
Evidence Summary
Rows
9
Stellar refs
8
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Luminositydisputed
Surface Gravitydisputed
Metallicitydisputed
Spectral Typestable
| ST TEFF | ST MASS | ST RAD | ST AGE | ST LUM | ST SPECTYPE | SY DIST | Stellar Ref | System Ref |
|---|---|---|---|---|---|---|---|---|
| 4779 | 0.77 | 0.77 | — | -0.55 | — | 403.5 | TICv8 | TICv8 |
| — | — | — | — | — | — | 403.5 | Barros et al. 2016 | TICv8 |
| 4890 | 0.79 | 0.74 | — | — | — | 403.5 | Montet et al. 2015 | TICv8 |
| 5147 | 0.84 | 0.80 | — | — | — | 403.5 | Crossfield et al. 2016 | TICv8 |
| 4870 | 0.78 | 0.74 | — | — | K3 V | 403.5 | Sinukoff et al. 2016 | TICv8 |
| 4849.2 | — | 0.72 | — | -0.58 | — | 403.5 | Gaia DR2 | TICv8 |
| 4797 | — | 0.73 | — | — | — | 403.5 | Vanderburg et al. 2016 | TICv8 |
| — | — | 0.71 | — | — | — | 403.5 | Kruse et al. 2019 | TICv8 |
| — | — | 0.71 | — | — | — | 403.5 | Kruse et al. 2019 | TICv8 |