Temperature
5520 K
5513.8 to 5609
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Stellar HostProfile
K2-181
Unclassified star โข 360.9 pc
Records
10
literature rows
Planets
1
system count
References
11
distinct source labels
TIC: TIC 366528389
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 โข System source: TICv8
Mass
1.02 Msun
0.96 to 1.04
Radius
1.04 Rsun
1.00 to 1.11
Age
5.90 Gyr
single adopted value
Luminosity
-0.04 log(Lsun)
-0.04 to -0.01
Distance
360.9 pc
single adopted value
Planets
1
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 1.04 Rโ (circles scaled linearly by radius)
Sun
1.0 Rโ baseline
K2-181
1.04 Rโ
System Layout
Known planets
1 planets linked to this host
K2-181 b
Transit
โ
Discovery
2018
Period
6.89 days
Radius
2.69 Rโ
Mass
โ
Eq. Temp
949 K
K2-181 b: A Neptune-like World in a Distant System
K2-181 is a star located 1180 light-years away, with an age of 5.9 billion years. Its mass is 1.02 solar masses, its radius is 1.04 solar radii, and its temperature is 5520 K. The star's reported radius estimate is larger than the Sun's, while its reported temperature is cooler than the Sun's. One planet orbits this host.
That planet is K2-181 b, a Neptune-like world discovered by transit in 2018. Transit occurs when a planet passes in front of its star from our viewpoint, causing a small dip in observed brightness. K2-181 b has an orbital period of 6.89 days and a radius of 2.69 Earth radii, which is larger than Earth's. As a Neptune-like planet, it falls within the size class reaching up to 4 times Earth's radius.
Provenance
Underlying measurements and references
Evidence Summary
Rows
10
Stellar refs
10
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Agestable
Luminositydisputed
Surface Gravitydisputed
Metallicitydisputed
| ST TEFF | ST MASS | ST RAD | ST AGE | ST LUM | ST SPECTYPE | SY DIST | Stellar Ref | System Ref |
|---|---|---|---|---|---|---|---|---|
| 5513.8 | โ | 1.07 | โ | -0.02 | โ | 360.9 | Gaia DR2 | TICv8 |
| 5609 | 1.04 | 1.00 | โ | โ | โ | 360.9 | Mayo et al. 2018 | TICv8 |
| 5528 | 0.96 | 1.06 | โ | โ | โ | 360.9 | Howard et al. 2025 | TICv8 |
| โ | โ | โ | โ | โ | โ | 360.9 | Barros et al. 2016 | TICv8 |
| 5608 | 0.99 | 1.07 | โ | โ | โ | 360.9 | Livingston et al. 2018 | TICv8 |
| โ | โ | 1.11 | โ | โ | โ | 360.9 | Petigura et al. 2018 | TICv8 |
| โ | โ | โ | โ | โ | โ | 360.9 | Pope et al. 2016 | TICv8 |
| โ | โ | 1.07 | โ | โ | โ | 360.9 | Kruse et al. 2019 | TICv8 |
| 5573 | 0.98 | 1.06 | โ | -0.01 | โ | 360.9 | TICv8 | TICv8 |
| 5520 | 1.02 | 1.04 | 5.90 | -0.04 | โ | 360.9 | Thygesen et al. 2023 | TICv8 |