Temperature
3903 K
3807 to 4069.0
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Stellar HostProfile
K2-122
Unclassified star • 72.04 pc
Records
11
literature rows
Planets
1
system count
References
12
distinct source labels
TIC: TIC 14635562
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
0.64 Msun
0.60 to 0.64
Radius
0.61 Rsun
0.53 to 0.63
Luminosity
-1.10 log(Lsun)
-1.16 to -1.10
Distance
72.04 pc
single adopted value
Planets
1
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 0.61 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
K2-122
0.61 R☉
System Layout
Known planets
1 planets linked to this host
K2-122 b
Transit
◌
Discovery
2017
Period
2.22 days
Radius
1.16 R⊕
Mass
—
Eq. Temp
769 K
K2-122: A Cool Dwarf and Its Close-In Planet
K2-122 is a star system 235 light-years away. Its host star is an M0 spectral type, a small, cool red dwarf with a reported mass estimate of 0.644 solar masses, a reported radius estimate of 0.612 solar radii, and a temperature of 3900 K. All three measurements are smaller or cooler than the Sun's corresponding values. One known planet orbits this star.
That planet, K2-122 b, was discovered in 2017 by the transit method, in which a planet passing in front of its star from our viewpoint causes a small dip in observed brightness. It is classified as Earth-like, meaning its radius stays within 1.5 times Earth's radius, and its reported radius estimate of 1.16 Earth radii is indeed larger than Earth's. K2-122 b completes one orbit in 2.22 days.
Provenance
Underlying measurements and references
Evidence Summary
Rows
11
Stellar refs
11
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Luminositydisputed
Surface Gravitydisputed
Metallicitydisputed
Spectral Typestable
| ST TEFF | ST MASS | ST RAD | ST AGE | ST LUM | ST SPECTYPE | SY DIST | Stellar Ref | System Ref |
|---|---|---|---|---|---|---|---|---|
| — | — | — | — | — | — | 72.04 | Barros et al. 2016 | TICv8 |
| 3993.4 | 0.63 | 0.59 | — | — | — | 72.04 | Dressing et al. 2017 | TICv8 |
| — | — | 0.63 | — | — | — | 72.04 | Petigura et al. 2018 | TICv8 |
| 4027 | 0.62 | 0.60 | — | — | — | 72.04 | Livingston et al. 2018 | TICv8 |
| 3807 | 0.60 | 0.61 | — | -1.15 | — | 72.04 | TICv8 | TICv8 |
| — | — | — | — | — | M0 | 72.04 | Luo et al. 2018 | TICv8 |
| 4009 | 0.63 | 0.59 | — | — | — | 72.04 | Castro-González et al. 2022 | TICv8 |
| 4069.0 | — | 0.53 | — | -1.16 | — | 72.04 | Gaia DR2 | TICv8 |
| 3903 | 0.64 | 0.61 | — | -1.10 | — | 72.04 | Hirano et al. 2018 | TICv8 |
| — | — | 0.53 | — | — | — | 72.04 | Kruse et al. 2019 | TICv8 |
| — | — | — | — | — | — | 72.04 | Pope et al. 2016 | TICv8 |