Temperature
4720 K
4689 to 4766.3
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Stellar HostProfile
K2-209
Unclassified star • 76.50 pc
Records
3
literature rows
Planets
1
system count
References
4
distinct source labels
TIC: TIC 257436461
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
0.74 Msun
0.74 to 0.75
Radius
0.71 Rsun
0.71 to 0.78
Distance
76.50 pc
single adopted value
Planets
1
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 0.71 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
K2-209
0.71 R☉
System Layout
Known planets
1 planets linked to this host
K2-209 b
Transit
◌
Discovery
2018
Period
2.08 days
Radius
0.87 R⊕
Mass
—
Eq. Temp
—
K2-209 b: A Sub-Earth Around a Cool Dwarf
K2-209 is a star 250 light-years away with one known planet. The host star has a reported mass of 0.745 solar masses and a radius of 0.712 solar radii, both smaller than the Sun's. Its temperature is 4720 K, cooler than the Sun's.
The planet K2-209 b was discovered in 2018 by the transit method, in which a planet passes in front of its star from our viewpoint and causes a small dip in observed brightness. It is classified as a Sub-Earth, a size class for planets smaller than Earth. Its radius is 0.869 Earth radii, smaller than Earth's. K2-209 b completes an orbit in 2.08 days.
Provenance
Underlying measurements and references
Evidence Summary
Rows
3
Stellar refs
3
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Luminositydisputed
Surface Gravitydisputed
Metallicitystable