Discovery Method
Transit
Consistent across records
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ExoplanetDetail
Kepler-18 c
Host star Kepler-18 • 5.49 R⊕ • 7.64 d orbit
Records
15
archive rows
Discovery
2011
Transit
Radius
5.49 R⊕
default parameter set
Mass
17.30 M⊕
default parameter set
Kepler-18
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: Cochran et al. 2011
Host Star
Kepler-18
Stable across source rows
Discovery Year
2011
Stable across source rows
Orbital Period
7.64 day
7.64 to 7.64
Semi-Major Axis
0.08 au
0.07 to 0.08
Radius
5.49 Rearth
4.27 to 5.49
Mass
17.30 Mearth
2.76 to 19.74
Density
0.59 g/cm**3
0.18 to 1.40
Scale Comparison
Radius against familiar reference worlds
Current adopted radius: 5.49 R⊕ • circles scaled linearly by radius
Earth
1.0 R⊕ baseline
Kepler-18 c
5.49 R⊕
Jupiter
11.2 R⊕ reference
Provenance
Underlying measurements and references
Evidence Summary
Rows
15
Refs
14
Methods
1
Discoverystable
Facilitystable
Periodstable
Radiusdisputed
Massdisputed
Eq. Tempdisputed
| Year | Method | Facility | Telescope | Period | Radius | Mass | Eq. Temp | Reference |
|---|---|---|---|---|---|---|---|---|
| 2011 | Transit | Kepler | 0.95 m Kepler Telescope | 7.64 day | — | 2.76 Mearth | — | Ofir et al. 2025 |
| 2011 | Transit | Kepler | 0.95 m Kepler Telescope | 7.64 day | 4.27 Rearth | 19.74 Mearth | — | Weiss et al. 2024 |
| 2011 | Transit | Kepler | 0.95 m Kepler Telescope | 7.64 day | 4.91 Rearth | — | 899 K | Q1-Q17 DR25 KOI Table |
| 2011 | Transit | Kepler | 0.95 m Kepler Telescope | 7.64 day | 4.27 Rearth | — | — | Fulton & Petigura 2018 |
| 2011 | Transit | Kepler | 0.95 m Kepler Telescope | — | 4.29 Rearth | — | — | Berger et al. 2018 |
| 2011 | Transit | Kepler | 0.95 m Kepler Telescope | 7.64 day | — | — | — | Holczer et al. 2016 |
| 2011 | Transit | Kepler | 0.95 m Kepler Telescope | 7.64 day | 4.75 Rearth | — | 858 K | Q1-Q8 KOI Table |
| 2011 | Transit | Kepler | 0.95 m Kepler Telescope | 7.64 day | — | — | — | Q1-Q17 DR25 Supplemental KOI Table |
| 2011 | Transit | Kepler | 0.95 m Kepler Telescope | 7.64 day | — | 6.30 Mearth | — | Ofir et al. 2025 |
| 2011 | Transit | Kepler | 0.95 m Kepler Telescope | 7.64 day | 4.98 Rearth | — | 899 K | Q1-Q12 KOI Table |
| 2011 | Transit | Kepler | 0.95 m Kepler Telescope | 7.64 day | 5.49 Rearth | 17.30 Mearth | — | Cochran et al. 2011 |
| 2011 | Transit | Kepler | 0.95 m Kepler Telescope | 7.64 day | 4.99 Rearth | — | — | Morton et al. 2016 |
| 2011 | Transit | Kepler | 0.95 m Kepler Telescope | 7.64 day | 4.98 Rearth | — | 899 K | Q1-Q17 DR24 KOI Table |
| 2011 | Transit | Kepler | 0.95 m Kepler Telescope | 7.64 day | 4.98 Rearth | — | 899 K | Q1-Q16 KOI Table |
| 2011 | Transit | Kepler | 0.95 m Kepler Telescope | 7.64 day | 5.22 Rearth | 18.40 Mearth | — | Hadden et al. 2014 |