Temperature
3717 K
3556.5 to 3717
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Stellar HostProfile
K2-251
Unclassified star • 147.0 pc
Records
3
literature rows
Planets
1
system count
References
4
distinct source labels
TIC: TIC 156584871
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: Livingston et al. 2018 • System source: TICv8
Mass
0.52 Msun
0.49 to 0.52
Radius
0.49 Rsun
0.49 to 0.56
Distance
147.0 pc
single adopted value
Planets
1
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 0.49 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
K2-251
0.49 R☉
System Layout
Known planets
1 planets linked to this host
K2-251 b
Transit
◌
Discovery
2018
Period
9.30 days
Radius
2.35 R⊕
Mass
—
Eq. Temp
437 K
K2-251 b: A Super-Earth Orbiting a Cool Dwarf Star
K2-251 is a star located 480 light-years away, with one planet known to orbit it. The host star has a mass of 0.52 solar masses, a radius of 0.49 solar radii, and a temperature of 3720 K, making it smaller, less massive, and cooler than the Sun.
The system's sole known planet, K2-251 b, is classified as a Super-Earth and was discovered by the transit method in 2018. A transit occurs when a planet passes in front of its star from our viewpoint, causing a small dip in observed brightness; repeated dips help establish orbital periods. K2-251 b completes an orbit every 9.3 days and has a radius of 2.35 Earth radii, larger than Earth's.
Provenance
Underlying measurements and references
Evidence Summary
Rows
3
Stellar refs
3
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Luminositydisputed
Surface Gravitydisputed
Metallicitystable