Temperature
3880 K
3856 to 4075.7
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Stellar HostProfile
K2-123
Unclassified star • 161.6 pc
Records
10
literature rows
Planets
1
system count
References
11
distinct source labels
TIC: TIC 197249801
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: Hirano et al. 2018 • System source: TICv8
Mass
0.61 Msun
0.60 to 0.65
Radius
0.59 Rsun
0.57 to 0.64
Luminosity
-1.14 log(Lsun)
-1.14 to -1.08
Distance
161.6 pc
single adopted value
Planets
1
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 0.59 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
K2-123
0.59 R☉
System Layout
Known planets
1 planets linked to this host
K2-123 b
Transit
◌
Discovery
2017
Period
30.95 days
Radius
2.76 R⊕
Mass
—
Eq. Temp
338 K
K2-123 b: A Neptune-Like World Around a Cool Dwarf Star
K2-123 is a star 527 light-years away with one known planet. The star has a reported mass of 0.615 solar masses and a radius of 0.592 solar radii, both smaller than the Sun's. Its temperature is 3880 K, cooler than the Sun's. These measurements describe the host star itself.
The planet K2-123 b is Neptune-like, a size class that reaches 4 times Earth's radius. Its radius is 2.76 Earth radii, larger than Earth's. It was discovered by transit in 2017, when it passed in front of its star from our viewpoint and caused a small dip in observed brightness. Its orbital period is 31 days.
Provenance
Underlying measurements and references
Evidence Summary
Rows
10
Stellar refs
10
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Luminositydisputed
Surface Gravitydisputed
Metallicitydisputed
| ST TEFF | ST MASS | ST RAD | ST AGE | ST LUM | ST SPECTYPE | SY DIST | Stellar Ref | System Ref |
|---|---|---|---|---|---|---|---|---|
| 3856 | 0.60 | 0.61 | — | -1.13 | — | 161.6 | TICv8 | TICv8 |
| — | — | 0.64 | — | — | — | 161.6 | Petigura et al. 2018 | TICv8 |
| — | — | 0.64 | — | — | — | 161.6 | Kruse et al. 2019 | TICv8 |
| 3880 | 0.61 | 0.59 | — | -1.14 | — | 161.6 | Hirano et al. 2018 | TICv8 |
| 3872.4 | — | 0.64 | — | -1.08 | — | 161.6 | Gaia DR2 | TICv8 |
| — | — | — | — | — | — | 161.6 | Pope et al. 2016 | TICv8 |
| 4040 | — | 0.60 | — | — | — | 161.6 | Yu et al. 2018 | TICv8 |
| 4075.7 | 0.65 | 0.57 | — | — | — | 161.6 | Dressing et al. 2017 | TICv8 |
| — | — | — | — | — | — | 161.6 | Barros et al. 2016 | TICv8 |
| 4035 | 0.62 | 0.59 | — | — | — | 161.6 | Livingston et al. 2018 | TICv8 |