Discovery Method
Radial Velocity
Consistent across records
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ExoplanetDetail
BD+20 2457 b
Host star BD+20 2457 • 379.6 d orbit
Records
2
archive rows
Discovery
2009
Radial Velocity
Radius
—
default parameter set
Mass
6807.6 M⊕
default parameter set
BD+20 2457
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: Niedzielski et al. 2009
Host Star
BD+20 2457
Stable across source rows
Discovery Year
2009
Stable across source rows
Orbital Period
379.6 day
single adopted value
Semi-Major Axis
1.45 au
1.05 to 1.45
Mass
6807.6 Mearth
6807.6 to 1.77e4
Provenance
Underlying measurements and references
Evidence Summary
Rows
2
Refs
2
Methods
1
Discoverystable
Facilitystable
Periodstable
Massdisputed
| Year | Method | Facility | Telescope | Period | Radius | Mass | Eq. Temp | Reference |
|---|---|---|---|---|---|---|---|---|
| 2009 | Radial Velocity | McDonald Observatory | 9.2 m Hobby-Eberly Telescope | 379.6 day | — | 1.77e4 Mearth | — | Stassun et al. 2017 |
| 2009 | Radial Velocity | McDonald Observatory | 9.2 m Hobby-Eberly Telescope | 379.6 day | — | 6807.6 Mearth | — | Niedzielski et al. 2009 |