Temperature
5569 K
5449 to 5569
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Stellar HostProfile
K2-172
Unclassified star • 249.7 pc
Records
7
literature rows
Planets
2
system count
References
7
distinct source labels
TIC: TIC 188507501
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
0.93 Msun
0.93 to 0.98
Radius
0.87 Rsun
0.82 to 0.87
Distance
249.7 pc
single adopted value
Planets
2
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 0.87 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
K2-172
0.87 R☉
System Layout
Known planets
2 planets linked to this host
K2-172: A Cooler, Smaller Sun With Two Known Planets
K2-172 is a star 815 light-years away with a reported mass of 0.934 solar masses, a radius of 0.869 solar radii, and a temperature of 5570 K. Its mass, radius, and temperature are all smaller or cooler than the Sun's. Two planets are known to orbit this host.
K2-172 b is a Super-Earth discovered by transit in 2018. Its orbital period is 14.3 days, and its radius is 1.67 Earth radii, larger than Earth's. K2-172 c is a Neptune-like planet, also found by transit in 2018, with an orbital period of 29.6 days and a radius of 3.21 Earth radii, also larger than Earth's. Among the listed planets, K2-172 b has the shortest year and the smallest radius, while K2-172 c has the longest year and the largest radius.
Provenance
Underlying measurements and references
Evidence Summary
Rows
7
Stellar refs
6
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 |
|---|---|---|---|---|---|---|---|---|
| — | — | 0.82 | — | — | — | 249.7 | Kruse et al. 2019 | TICv8 |
| — | — | — | — | — | — | 249.7 | Schmitt et al. 2016 | TICv8 |
| 5569 | 0.93 | 0.87 | — | — | — | 249.7 | Mayo et al. 2018 | TICv8 |
| — | — | 0.82 | — | — | — | 249.7 | Kruse et al. 2019 | TICv8 |
| 5564 | — | 0.82 | — | -0.23 | — | 249.7 | Gaia DR2 | TICv8 |
| 5449 | — | 0.86 | — | — | — | 249.7 | Vanderburg et al. 2016 | TICv8 |
| 5547 | 0.98 | 0.86 | — | -0.20 | — | 249.7 | TICv8 | TICv8 |