Discovery Method
Transit
Consistent across records
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ExoplanetDetail
K2-21 b
Host star K2-21 • 1.84 R⊕ • 9.33 d orbit
Records
5
archive rows
Discovery
2015
Transit
Radius
1.84 R⊕
default parameter set
Mass
—
default parameter set
K2-21
temperature unconstrained
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: Dressing et al. 2017
Host Star
K2-21
Stable across source rows
Discovery Year
2015
Stable across source rows
Orbital Period
9.33 day
9.32 to 9.33
Semi-Major Axis
0.08 au
0.07 to 0.08
Radius
1.84 Rearth
1.25 to 1.89
Scale Comparison
Radius against familiar reference worlds
Current adopted radius: 1.84 R⊕ • circles scaled linearly by radius
Earth
1.0 R⊕ baseline
K2-21 b
1.84 R⊕
Jupiter
11.2 R⊕ reference
Provenance
Underlying measurements and references
Evidence Summary
Rows
5
Refs
5
Methods
1
Discoverystable
Facilitystable
Perioddisputed
Radiusdisputed
Eq. Tempstable
| Year | Method | Facility | Telescope | Period | Radius | Mass | Eq. Temp | Reference |
|---|---|---|---|---|---|---|---|---|
| 2015 | Transit | K2 | 0.95 m Kepler Telescope | 9.32 day | 1.59 Rearth | — | 500 K | Petigura et al. 2015 |
| 2015 | Transit | K2 | 0.95 m Kepler Telescope | 9.32 day | 1.70 Rearth | — | — | Kruse et al. 2019 |
| 2015 | Transit | K2 | 0.95 m Kepler Telescope | 9.32 day | 1.25 Rearth | — | — | Crossfield et al. 2016 |
| 2015 | Transit | K2 | 0.95 m Kepler Telescope | 9.33 day | 1.84 Rearth | — | — | Dressing et al. 2017 |
| 2015 | Transit | K2 | 0.95 m Kepler Telescope | 9.33 day | 1.89 Rearth | — | — | Vanderburg et al. 2016 |