Temperature
5176 K
4961 to 5176
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Stellar HostProfile
K2-191
Unclassified star • 287.2 pc
Records
6
literature rows
Planets
1
system count
References
7
distinct source labels
TIC: TIC 335102224
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
0.90 Msun
0.83 to 0.90
Radius
0.84 Rsun
0.84 to 0.90
Distance
287.2 pc
single adopted value
Planets
1
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 0.84 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
K2-191
0.84 R☉
System Layout
Known planets
1 planets linked to this host
K2-191 b
Transit
◌
Discovery
2018
Period
2.86 days
Radius
1.58 R⊕
Mass
—
Eq. Temp
—
K2-191 b: A Super-Earth in a Close Orbit
K2-191 is a star located 937 light-years away. It has a mass of 0.901 solar masses and a radius of 0.84 solar radii, making it slightly less massive and slightly smaller than the Sun. Its temperature is 5180 K, which is cooler than the Sun. One planet is known to orbit this star.
That planet, K2-191 b, was discovered in 2018 using the transit method, in which a planet passes in front of its star from our viewpoint and causes a small dip in observed brightness. Repeated dips help establish orbital periods. K2-191 b completes an orbit every 2.86 days. Its radius is 1.58 Earth radii, larger than Earth's. This radius places it within the Super-Earth size class, which reaches 2.5 times Earth's radius.
The star's reported mass estimate is smaller than the Sun's, and its radius estimate is also smaller than the Sun's.
Provenance
Underlying measurements and references
Evidence Summary
Rows
6
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 |
|---|---|---|---|---|---|---|---|---|
| — | — | 0.90 | — | — | — | 287.2 | Kruse et al. 2019 | TICv8 |
| — | — | — | — | — | — | 287.2 | Barros et al. 2016 | TICv8 |
| 5012 | 0.83 | 0.89 | — | -0.35 | — | 287.2 | TICv8 | TICv8 |
| 4961 | — | 0.90 | — | -0.36 | — | 287.2 | Gaia DR2 | TICv8 |
| 5176 | 0.90 | 0.84 | — | — | — | 287.2 | Mayo et al. 2018 | TICv8 |
| — | — | — | — | — | — | 287.2 | Pope et al. 2016 | TICv8 |