Discovery Method
Radial Velocity
Consistent across records
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ExoplanetDetail
HD 209458 b
Host star HD 209458 • 15.58 R⊕ • 3.52 d orbit
Records
23
archive rows
Discovery
1999
Radial Velocity
Radius
15.58 R⊕
default parameter set
Mass
232.0 M⊕
default parameter set
HD 209458
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: Stassun et al. 2017
Host Star
HD 209458
Stable across source rows
Discovery Year
1999
Stable across source rows
Orbital Period
3.52 day
3.50 to 3.52
Radius
15.58 Rearth
9.19 to 16.38
Mass
232.0 Mearth
197.1 to 235.2
Scale Comparison
Radius against familiar reference worlds
Current adopted radius: 15.58 R⊕ • circles scaled linearly by radius
Earth
1.0 R⊕ baseline
HD 209458 b
15.58 R⊕
Jupiter
11.2 R⊕ reference
Provenance
Underlying measurements and references
Evidence Summary
Rows
23
Refs
23
Methods
1
Discoverystable
Facilitystable
Perioddisputed
Radiusdisputed
Massdisputed
Eq. Tempdisputed
| Year | Method | Facility | Telescope | Period | Radius | Mass | Eq. Temp | Reference |
|---|---|---|---|---|---|---|---|---|
| 1999 | Radial Velocity | W. M. Keck Observatory | 10 m Keck I Telescope | 3.52 day | 15.23 Rearth | 217.7 Mearth | 1449 K | Torres et al. 2008 |
| 1999 | Radial Velocity | W. M. Keck Observatory | 10 m Keck I Telescope | 3.52 day | — | — | 1484 K | Evans et al. 2015 |
| 1999 | Radial Velocity | W. M. Keck Observatory | 10 m Keck I Telescope | 3.52 day | 15.24 Rearth | 219.3 Mearth | 1450 K | Sing et al. 2016 |
| 1999 | Radial Velocity | W. M. Keck Observatory | 10 m Keck I Telescope | 3.52 day | 15.47 Rearth | 226.9 Mearth | 1459 K | Southworth 2010 |
| 1999 | Radial Velocity | W. M. Keck Observatory | 10 m Keck I Telescope | — | 15.10 Rearth | — | — | Brown et al. 2001 |
| 1999 | Radial Velocity | W. M. Keck Observatory | 10 m Keck I Telescope | 3.52 day | 14.80 Rearth | — | — | Knutson et al. 2007 |
| 1999 | Radial Velocity | W. M. Keck Observatory | 10 m Keck I Telescope | 3.52 day | — | 222.2 Mearth | — | Naef et al. 2004 |
| 1999 | Radial Velocity | W. M. Keck Observatory | 10 m Keck I Telescope | 3.52 day | 15.92 Rearth | 197.1 Mearth | — | Henry et al. 2000 |
| 1999 | Radial Velocity | W. M. Keck Observatory | 10 m Keck I Telescope | 3.52 day | 14.24 Rearth | 200.2 Mearth | — | Charbonneau et al. 2000 |
| 1999 | Radial Velocity | W. M. Keck Observatory | 10 m Keck I Telescope | — | 16.26 Rearth | 203.4 Mearth | — | Boyajian et al. 2015 |
| 1999 | Radial Velocity | W. M. Keck Observatory | 10 m Keck I Telescope | 3.50 day | 15.70 Rearth | 219.3 Mearth | 1450 K | Salz et al. 2015 |
| 1999 | Radial Velocity | W. M. Keck Observatory | 10 m Keck I Telescope | — | — | — | — | Albrecht et al. 2012 |
| 1999 | Radial Velocity | W. M. Keck Observatory | 10 m Keck I Telescope | 3.52 day | 16.38 Rearth | — | 1371 K | ExoFOP |
| 1999 | Radial Velocity | W. M. Keck Observatory | 10 m Keck I Telescope | — | — | — | — | Casasayas-Barris et al. 2020 |
| 1999 | Radial Velocity | W. M. Keck Observatory | 10 m Keck I Telescope | — | 15.92 Rearth | 217.7 Mearth | — | Cody & Sasselov 2002 |
| 1999 | Radial Velocity | W. M. Keck Observatory | 10 m Keck I Telescope | — | 15.80 Rearth | 235.2 Mearth | — | del Burgo & Allende Prieto 2016 |
| 1999 | Radial Velocity | W. M. Keck Observatory | 10 m Keck I Telescope | 3.52 day | 15.58 Rearth | 232.0 Mearth | — | Stassun et al. 2017 |
| 1999 | Radial Velocity | W. M. Keck Observatory | 10 m Keck I Telescope | 3.52 day | 15.23 Rearth | 216.8 Mearth | — | Bonomo et al. 2017 |
| 1999 | Radial Velocity | W. M. Keck Observatory | 10 m Keck I Telescope | — | — | — | 1448 K | Barstow et al. 2017 |
| 1999 | Radial Velocity | W. M. Keck Observatory | 10 m Keck I Telescope | 3.52 day | — | 211.4 Mearth | — | Rosenthal et al. 2021 |
| 1999 | Radial Velocity | W. M. Keck Observatory | 10 m Keck I Telescope | 3.52 day | — | — | — | Kokori et al. 2022 |
| 1999 | Radial Velocity | W. M. Keck Observatory | 10 m Keck I Telescope | — | 9.19 Rearth | — | — | Panek et al. 2023 |
| 1999 | Radial Velocity | W. M. Keck Observatory | 10 m Keck I Telescope | 3.52 day | — | — | — | Kokori et al. 2023 |