Temperature
5340 K
5083.6 to 5425
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Stellar HostProfile
K2-139
K0 V • 153.9 pc
Records
7
literature rows
Planets
1
system count
References
8
distinct source labels
TIC: TIC 11023038
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: Barragán et al. 2018 • System source: TICv8
Mass
0.92 Msun
0.88 to 0.96
Radius
0.86 Rsun
0.86 to 0.93
Age
1.80 Gyr
single adopted value
Distance
153.9 pc
single adopted value
Spectral Type
K0 V
Consistent across records
Planets
1
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 0.86 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
K2-139
0.86 R☉
System Layout
Known planets
1 planets linked to this host
K2-139 b
Transit
◌
Discovery
2017
Period
28.38 days
Radius
9.11 R⊕
Mass
—
Eq. Temp
524 K
K2-139 and Its Jupiter-Like Planet
K2-139 is a K0 V star 502 light-years away. This spectral type marks it as a main-sequence dwarf, and it hosts one known planet. The star's age is 1.8 billion years, its mass is 0.919 solar masses, and its radius is 0.862 solar radii. Its temperature is 5340 K, and its reported mass and radius estimates are smaller than the Sun's while its reported temperature is cooler.
The sole named planet is K2-139 b, a Jupiter-like world discovered by transit in 2017. Its orbital period is 28.4 days, and its radius is 9.11 Earth radii, larger than Earth's. Because the Jupiter-like class exceeds 4 times Earth's radius, that size classification reflects the planet's radius alone.
Provenance
Underlying measurements and references
Evidence Summary
Rows
7
Stellar refs
7
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Agestable
Luminositydisputed
Surface Gravitydisputed
Metallicitydisputed
Spectral Typestable
| ST TEFF | ST MASS | ST RAD | ST AGE | ST LUM | ST SPECTYPE | SY DIST | Stellar Ref | System Ref |
|---|---|---|---|---|---|---|---|---|
| 5370 | 0.96 | 0.88 | — | — | — | 153.9 | Livingston et al. 2018 | TICv8 |
| 5195 | 0.88 | 0.89 | — | -0.28 | — | 153.9 | TICv8 | TICv8 |
| 5083.6 | — | 0.91 | — | -0.30 | — | 153.9 | Gaia DR2 | TICv8 |
| — | — | 0.91 | — | — | — | 153.9 | Kruse et al. 2019 | TICv8 |
| — | — | 0.93 | — | — | — | 153.9 | Petigura et al. 2018 | TICv8 |
| 5425 | 0.95 | 0.87 | — | — | — | 153.9 | Mayo et al. 2018 | TICv8 |
| 5340 | 0.92 | 0.86 | 1.80 | — | K0 V | 153.9 | Barragán et al. 2018 | TICv8 |