Discovery Method
Transit
Consistent across records
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ExoplanetDetail
GJ 9827 b
Host star GJ 9827 • 1.44 R⊕ • 1.21 d orbit
Records
10
archive rows
Discovery
2017
Transit
Radius
1.44 R⊕
default parameter set
Mass
4.28 M⊕
default parameter set
GJ 9827
1035.0 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: Passegger et al. 2024
Host Star
GJ 9827
Stable across source rows
Discovery Year
2017
Stable across source rows
Orbital Period
1.21 day
1.21 to 1.21
Semi-Major Axis
0.02 au
0.02 to 0.02
Radius
1.44 Rearth
1.44 to 1.75
Mass
4.28 Mearth
3.42 to 5.14
Density
7.86 g/cm**3
4.50 to 7.86
Equilibrium Temperature
1035.0 K
1035.0 to 1183
Scale Comparison
Radius against familiar reference worlds
Current adopted radius: 1.44 R⊕ • circles scaled linearly by radius
Earth
1.0 R⊕ baseline
GJ 9827 b
1.44 R⊕
Jupiter
11.2 R⊕ reference
Provenance
Underlying measurements and references
Evidence Summary
Rows
10
Refs
10
Methods
1
Discoverystable
Facilitystable
Periodstable
Radiusdisputed
Massdisputed
Eq. Tempdisputed
| Year | Method | Facility | Telescope | Period | Radius | Mass | Eq. Temp | Reference |
|---|---|---|---|---|---|---|---|---|
| 2017 | Transit | K2 | 0.95 m Kepler Telescope | 1.21 day | 1.58 Rearth | 4.91 Mearth | — | Rice et al. 2019 |
| 2017 | Transit | K2 | 0.95 m Kepler Telescope | 1.21 day | 1.57 Rearth | 4.89 Mearth | — | Dai et al. 2019 |
| 2017 | Transit | K2 | 0.95 m Kepler Telescope | 1.21 day | 1.69 Rearth | — | 1183 K | ExoFOP |
| 2017 | Transit | K2 | 0.95 m Kepler Telescope | 1.21 day | 1.58 Rearth | 5.14 Mearth | 1175 K | Bonomo et al. 2023 |
| 2017 | Transit | K2 | 0.95 m Kepler Telescope | 1.21 day | 1.53 Rearth | 4.87 Mearth | 1055 K | Howard et al. 2025 |
| 2017 | Transit | K2 | 0.95 m Kepler Telescope | 1.21 day | 1.75 Rearth | — | 1043.5 K | Niraula et al. 2017 |
| 2017 | Transit | K2 | 0.95 m Kepler Telescope | 1.21 day | 1.62 Rearth | 3.42 Mearth | 1172 K | Rodriguez et al. 2018 |
| 2017 | Transit | K2 | 0.95 m Kepler Telescope | 1.21 day | 1.58 Rearth | 3.69 Mearth | 1114 K | Prieto-Arranz et al. 2018 |
| 2017 | Transit | K2 | 0.95 m Kepler Telescope | 1.21 day | — | — | — | Kokori et al. 2023 |
| 2017 | Transit | K2 | 0.95 m Kepler Telescope | 1.21 day | 1.44 Rearth | 4.28 Mearth | 1035.0 K | Passegger et al. 2024 |