Temperature
4300 K
4237 to 4456
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Stellar HostProfile
K2-55
Unclassified star • 159.5 pc
Records
10
literature rows
Planets
1
system count
References
11
distinct source labels
TIC: TIC 437704321
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: Howard et al. 2025 • System source: TICv8
Mass
0.69 Msun
0.67 to 0.70
Radius
0.71 Rsun
0.63 to 0.74
Distance
159.5 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
K2-55
0.71 R☉
System Layout
Known planets
1 planets linked to this host
K2-55 b
Transit
◌
Discovery
2016
Period
2.85 days
Radius
4.43 R⊕
Mass
44 M⊕
Eq. Temp
900 K
K2-55 b: A Jupiter-Like World Around a Cool Dwarf
K2-55 is a star 520 light-years away with one known planet. The star is smaller and less massive than the Sun, with 0.688 solar masses and 0.715 solar radii, and its temperature of 4300 K makes it cooler than the Sun.
The sole known planet, K2-55 b, is a Jupiter-like world, meaning its radius exceeds four times Earth's. It was discovered by the transit method, in which a planet passing in front of its star produces a small dip in observed brightness. K2-55 b has a radius of 4.43 Earth radii and a mass of 44 Earth masses, both larger than Earth's corresponding values. Its mean density is 2.79 g/cm³, 0.506 times Earth's. The planet completes one orbit every 2.85 days.
Provenance
Underlying measurements and references
Evidence Summary
Rows
10
Stellar refs
10
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Luminositydisputed
Surface Gravitydisputed
Metallicitystable
| ST TEFF | ST MASS | ST RAD | ST AGE | ST LUM | ST SPECTYPE | SY DIST | Stellar Ref | System Ref |
|---|---|---|---|---|---|---|---|---|
| 4237 | — | 0.65 | — | — | — | 159.5 | Vanderburg et al. 2016 | TICv8 |
| — | — | — | — | — | — | 159.5 | Barros et al. 2016 | TICv8 |
| 4279 | — | 0.74 | — | — | — | 159.5 | ExoFOP | TICv8 |
| 4456 | 0.70 | 0.63 | — | — | — | 159.5 | Crossfield et al. 2016 | TICv8 |
| 4422 | — | 0.66 | — | -0.82 | — | 159.5 | Gaia DR2 | TICv8 |
| — | — | 0.66 | — | — | — | 159.5 | Kruse et al. 2019 | TICv8 |
| 4300.0 | 0.69 | 0.72 | — | — | — | 159.5 | Dressing et al. 2017 | TICv8 |
| — | — | — | — | — | — | 159.5 | Schmitt et al. 2016 | TICv8 |
| 4300 | 0.69 | 0.71 | — | — | — | 159.5 | Howard et al. 2025 | TICv8 |
| 4279 | 0.67 | 0.74 | — | -0.78 | — | 159.5 | TICv8 | TICv8 |