Discovery Method
Transit
Consistent across records
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ExoplanetDetail
K2-222 b
Host star K2-222 • 2.27 R⊕ • 15.39 d orbit
Records
8
archive rows
Discovery
2018
Transit
Radius
2.27 R⊕
default parameter set
Mass
7.50 M⊕
default parameter set
K2-222
803 K equilibrium
Canonical Summary
Adopted planet values from the default parameter set
Values come from the archive's default parameter set. Missing values stay missing. Ranges and counts describe all source rows.
Selected source: Palethorpe et al. 2026
Host Star
K2-222
Stable across source rows
Discovery Year
2018
Stable across source rows
Orbital Period
15.39 day
15.39 to 15.39
Semi-Major Axis
0.12 au
0.12 to 0.12
Radius
2.27 Rearth
2.10 to 2.54
Mass
7.50 Mearth
5.70 to 8.70
Density
3.72 g/cm**3
2 to 3.72
Equilibrium Temperature
803 K
779.2 to 878
Scale Comparison
Radius against familiar reference worlds
Current adopted radius: 2.27 R⊕ • circles scaled linearly by radius
Earth
1.0 R⊕ baseline
K2-222 b
2.27 R⊕
Jupiter
11.2 R⊕ reference
Provenance
Underlying measurements and references
Evidence Summary
Rows
8
Refs
8
Methods
1
Discoverystable
Facilitystable
Periodstable
Radiusdisputed
Massdisputed
Eq. Tempdisputed
| Year | Method | Facility | Telescope | Period | Radius | Mass | Eq. Temp | Reference |
|---|---|---|---|---|---|---|---|---|
| 2018 | Transit | K2 | 0.95 m Kepler Telescope | 15.39 day | 2.35 Rearth | 8.70 Mearth | 871 K | Bonomo et al. 2023 |
| 2018 | Transit | K2 | 0.95 m Kepler Telescope | 15.39 day | 2.35 Rearth | 8 Mearth | 878 K | Nava et al. 2022 |
| 2018 | Transit | K2 | 0.95 m Kepler Telescope | 15.39 day | 2.10 Rearth | — | — | Petigura et al. 2018 |
| 2018 | Transit | K2 | 0.95 m Kepler Telescope | 15.39 day | 2.27 Rearth | 7.50 Mearth | 803 K | Palethorpe et al. 2026 |
| 2018 | Transit | K2 | 0.95 m Kepler Telescope | 15.39 day | 2.54 Rearth | — | 779.2 K | ExoFOP |
| 2018 | Transit | K2 | 0.95 m Kepler Telescope | 15.39 day | 2.41 Rearth | 5.70 Mearth | 801 K | Howard et al. 2025 |
| 2018 | Transit | K2 | 0.95 m Kepler Telescope | 15.39 day | 2.39 Rearth | — | 801 K | Livingston et al. 2018 |
| 2018 | Transit | K2 | 0.95 m Kepler Telescope | 15.39 day | 2.22 Rearth | — | — | Mayo et al. 2018 |