Discovery Method
Radial Velocity
Consistent across records
←Back to Exoplanets
ExoplanetDetail
51 Peg b
Host star 51 Peg • 4.23 d orbit
Records
6
archive rows
Discovery
1995
Radial Velocity
Radius
—
default parameter set
Mass
193.9 M⊕
default parameter set
51 Peg
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: Cont et al. 2026
Host Star
51 Peg
Stable across source rows
Discovery Year
1995
Stable across source rows
Orbital Period
4.23 day
4.23 to 4.23
Semi-Major Axis
0.05 au
0.05 to 0.05
Mass
193.9 Mearth
146.2 to 193.9
Provenance
Underlying measurements and references
Evidence Summary
Rows
6
Refs
6
Methods
1
Discoverystable
Facilitystable
Periodstable
Massdisputed
| Year | Method | Facility | Telescope | Period | Radius | Mass | Eq. Temp | Reference |
|---|---|---|---|---|---|---|---|---|
| 1995 | Radial Velocity | Haute-Provence Observatory | 1.93 m Telescope | 4.23 day | — | 148.7 Mearth | — | Naef et al. 2004 |
| 1995 | Radial Velocity | Haute-Provence Observatory | 1.93 m Telescope | 4.23 day | — | 149.4 Mearth | — | Mayor & Queloz 1995 |
| 1995 | Radial Velocity | Haute-Provence Observatory | 1.93 m Telescope | 4.23 day | — | 146.2 Mearth | — | Martins et al. 2015 |
| 1995 | Radial Velocity | Haute-Provence Observatory | 1.93 m Telescope | 4.23 day | — | 147.5 Mearth | — | Rosenthal et al. 2021 |
| 1995 | Radial Velocity | Haute-Provence Observatory | 1.93 m Telescope | 4.23 day | — | 193.9 Mearth | — | Cont et al. 2026 |
| 1995 | Radial Velocity | Haute-Provence Observatory | 1.93 m Telescope | 4.23 day | — | 150.0 Mearth | — | Butler et al. 2006 |