Stellar HostProfile

K2-221

Unclassified star • 318.8 pc

Records

literature rows

Planets

system count

References

distinct source labels

TIC: TIC 257801011

Approximate color

from effective temperature

Stellar source: Mayo et al. 2018 • System source: TICv8

Temperature

5716 K

5376.3 to 5716

3 values • 3 distinct

Mass

1.01 Msun

1 to 1.01

2 values • 2 distinct

Radius

0.95 Rsun

0.95 to 1.07

4 values • 4 distinct

Distance

318.8 pc

single adopted value

4 values • 1 distinct

Planets

Stable across source rows

Sun

1.0 R☉ baseline

K2-221

0.95 R☉

Discovery

2018

Period

2.40 days

Radius

1.68 R⊕

Mass

—

Eq. Temp

—

K2-221 and Its Super-Earth

K2-221 is a star located 1040 light-years away. It has one known planet. The star's mass is 1.01 solar masses, and its radius is 0.948 solar radii, which is smaller than the Sun's. Its temperature is 5720 K, cooler than the Sun's.

The planet K2-221 b is a Super-Earth discovered in 2018 by the transit method, in which a planet passing in front of its star causes a small dip in observed brightness. Repeated dips help establish orbital periods. K2-221 b orbits every 2.4 days and has a radius of 1.68 Earth radii, larger than Earth's.

Evidence Summary

Rows

Stellar refs

System refs

Distancestable

4 values • 1 distinct

Parallaxstable

4 values • 1 distinct

Temperaturedisputed

3 values • 3 distinct

Massdisputed

2 values • 2 distinct

Radiusdisputed

4 values • 4 distinct

Luminositydisputed

2 values • 2 distinct

Surface Gravitydisputed

2 values • 2 distinct

Metallicitystable

1 values • 1 distinct

ST TEFF	ST MASS	ST RAD	ST AGE	ST LUM	ST SPECTYPE	SY DIST	Stellar Ref	System Ref
5376.3	—	1.07	—	-0.06	—	318.8	Gaia DR2	TICv8
5623	1	1.03	—	-0.02	—	318.8	TICv8	TICv8
5716	1.01	0.95	—	—	—	318.8	Mayo et al. 2018	TICv8
—	—	1.07	—	—	—	318.8	Kruse et al. 2019	TICv8

K2-221

Adopted host values from one source row

Radius against the Sun

Known planets

K2-221 b

K2-221 and Its Super-Earth

Underlying measurements and references