Discovery Method
Transit
Consistent across records
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ExoplanetDetail
HR 858 b
Host star HR 858 • 2.00 R⊕ • 3.59 d orbit
Records
3
archive rows
Discovery
2019
Transit
Radius
2.00 R⊕
default parameter set
Mass
3.55 M⊕
default parameter set
HR 858
1552 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: Bonfanti et al. 2025
Host Star
HR 858
Stable across source rows
Discovery Year
2019
Stable across source rows
Orbital Period
3.59 day
3.59 to 3.59
Semi-Major Axis
0.05 au
0.05 to 0.05
Radius
2.00 Rearth
1.77 to 2.08
Mass
3.55 Mearth
single adopted value
Density
2.44 g/cm**3
single adopted value
Equilibrium Temperature
1552 K
1404 to 1572
Scale Comparison
Radius against familiar reference worlds
Current adopted radius: 2.00 R⊕ • circles scaled linearly by radius
Earth
1.0 R⊕ baseline
HR 858 b
2.00 R⊕
Jupiter
11.2 R⊕ reference
Provenance
Underlying measurements and references
Evidence Summary
Rows
3
Refs
3
Methods
1
Discoverystable
Facilitystable
Periodstable
Radiusdisputed
Massstable
Eq. Tempdisputed
| Year | Method | Facility | Telescope | Period | Radius | Mass | Eq. Temp | Reference |
|---|---|---|---|---|---|---|---|---|
| 2019 | Transit | Transiting Exoplanet Survey Satellite (TESS) | 0.1 m TESS Telescope | 3.59 day | 1.77 Rearth | — | 1404 K | ExoFOP |
| 2019 | Transit | Transiting Exoplanet Survey Satellite (TESS) | 0.1 m TESS Telescope | 3.59 day | 2.00 Rearth | 3.55 Mearth | 1552 K | Bonfanti et al. 2025 |
| 2019 | Transit | Transiting Exoplanet Survey Satellite (TESS) | 0.1 m TESS Telescope | 3.59 day | 2.08 Rearth | — | 1572 K | Vanderburg et al. 2019 |