Temperature
5250 K
5032 to 5250
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Stellar HostProfile
K2-171
Unclassified star • 606.1 pc
Records
5
literature rows
Planets
1
system count
References
6
distinct source labels
TIC: TIC 206241306
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
0.89 Msun
single adopted value
Radius
1.72 Rsun
0.77 to 2.38
Distance
606.1 pc
single adopted value
Planets
1
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 1.72 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
K2-171
1.72 R☉
System Layout
Known planets
1 planets linked to this host
K2-171 b
Transit
◌
Discovery
2018
Period
5.63 days
Radius
2.69 R⊕
Mass
—
Eq. Temp
—
K2-171 b: A Neptune-Like World Orbiting a Cooler Star
K2-171 is a star located 1980 light-years away, and it hosts one known planet. That star has 0.892 solar masses and a radius of 1.72 solar radii, making it less massive than the Sun but physically larger. Its temperature of 5250 K means it is cooler than the Sun.
The single planet in this system is K2-171 b, a Neptune-like world discovered in 2018 by the transit method, which detects the small dip in starlight caused when a planet crosses in front of its star. K2-171 b completes an orbit in 5.63 days and has a radius of 2.69 Earth radii, larger than Earth's radius. The planet's size class reflects a radius that reaches up to four times Earth's, placing it firmly among the Neptune-like planets.
Provenance
Underlying measurements and references
Evidence Summary
Rows
5
Stellar refs
5
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massstable
Radiusdisputed
Luminositystable
Surface Gravitystable
Metallicitystable
| ST TEFF | ST MASS | ST RAD | ST AGE | ST LUM | ST SPECTYPE | SY DIST | Stellar Ref | System Ref |
|---|---|---|---|---|---|---|---|---|
| 5153 | — | 2.31 | — | — | — | 606.1 | TICv8 | TICv8 |
| 5037 | — | 2.38 | — | 0.52 | — | 606.1 | Gaia DR2 | TICv8 |
| — | — | 2.38 | — | — | — | 606.1 | Kruse et al. 2019 | TICv8 |
| 5250 | 0.89 | 1.72 | — | — | — | 606.1 | Mayo et al. 2018 | TICv8 |
| 5032 | — | 0.77 | — | — | — | 606.1 | Vanderburg et al. 2016 | TICv8 |