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Stellar HostProfile

K2-208

Unclassified star • 256.9 pc

Records

5

literature rows

Planets

1

system count

References

6

distinct source labels

TIC: TIC 399722652

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: Thygesen et al. 2023 • System source: TICv8

Temperature

5500 K

5412 to 5582

4 values • 4 distinct

Mass

0.88 Msun

0.88 to 0.97

3 values • 3 distinct

Radius

0.87 Rsun

0.86 to 0.89

5 values • 5 distinct

Age

6.10 Gyr

single adopted value

1 values • 1 distinct

Luminosity

-0.20 log(Lsun)

-0.21 to -0.20

3 values • 3 distinct

Distance

256.9 pc

single adopted value

5 values • 1 distinct

Planets

1

Stable across source rows

1

Scale Comparison

Radius against the Sun

Current adopted radius: 0.87 R☉ (circles scaled linearly by radius)

Sun

1.0 R☉ baseline

K2-208

0.87 R☉

System Layout

Known planets

1 planets linked to this host

K2-208 b

Transit

◌

Discovery

2018

Period

4.19 days

Radius

1.67 R⊕

Mass

—

Eq. Temp

1122 K

K2-208: A Cool, Older Star With One Known Super-Earth

K2-208 is a star 838 light-years away with one known planet. It is 6.1 billion years old, has 0.881 solar masses and 0.872 solar radii, and a temperature of 5500 K, making it less massive, smaller, and cooler than the Sun.

The planet, K2-208 b, was discovered in 2018 by the transit method. 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. K2-208 b completes an orbit every 4.19 days, and its radius of 1.67 Earth radii is larger than Earth's. That radius places it in the Super-Earth size class, which reaches 2.5 times Earth's radius. Planet size classes compare radius with Earth's; they do not indicate composition.

Provenance

Underlying measurements and references

Download JSONDownload CSV

Evidence Summary

Rows

5

Stellar refs

5

System refs

1

Distancestable

5 values • 1 distinct

Parallaxstable

5 values • 1 distinct

Temperaturedisputed

4 values • 4 distinct

Massdisputed

3 values • 3 distinct

Radiusdisputed

5 values • 5 distinct

Agestable

1 values • 1 distinct

Luminositydisputed

3 values • 3 distinct

Surface Gravitydisputed

3 values • 3 distinct

Metallicitydisputed

2 values • 2 distinct

ST TEFFST MASSST RADST AGEST LUMST SPECTYPESY DISTStellar RefSystem Ref
——0.89———256.9Kruse et al. 2019TICv8
55290.970.86—-0.21—256.9TICv8TICv8
5412—0.89—-0.21—256.9Gaia DR2TICv8
55000.880.876.10-0.20—256.9Thygesen et al. 2023TICv8
55820.930.86———256.9Mayo et al. 2018TICv8