Discovery Method
Transit
Consistent across records
←Back to Exoplanets
ExoplanetDetail
HD 21520 b
Host star HD 21520 • 2.70 R⊕ • 25.13 d orbit
Records
2
archive rows
Discovery
2024
Transit
Radius
2.70 R⊕
default parameter set
Mass
17.70 M⊕
default parameter set
HD 21520
637 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: Nies et al. 2024
Host Star
HD 21520
Stable across source rows
Discovery Year
2024
Stable across source rows
Orbital Period
25.13 day
25.13 to 25.13
Semi-Major Axis
0.17 au
single adopted value
Radius
2.70 Rearth
1.93 to 2.70
Mass
17.70 Mearth
single adopted value
Density
1.35 g/cm**3
single adopted value
Equilibrium Temperature
637 K
627 to 637
Scale Comparison
Radius against familiar reference worlds
Current adopted radius: 2.70 R⊕ • circles scaled linearly by radius
Earth
1.0 R⊕ baseline
HD 21520 b
2.70 R⊕
Jupiter
11.2 R⊕ reference
Provenance
Underlying measurements and references
Evidence Summary
Rows
2
Refs
2
Methods
1
Discoverystable
Facilitystable
Periodstable
Radiusdisputed
Massstable
Eq. Tempdisputed
| Year | Method | Facility | Telescope | Period | Radius | Mass | Eq. Temp | Reference |
|---|---|---|---|---|---|---|---|---|
| 2024 | Transit | Transiting Exoplanet Survey Satellite (TESS) | 0.1 m TESS Telescope | 25.13 day | 2.70 Rearth | 17.70 Mearth | 637 K | Nies et al. 2024 |
| 2024 | Transit | Transiting Exoplanet Survey Satellite (TESS) | 0.1 m TESS Telescope | 25.13 day | 1.93 Rearth | — | 627 K | ExoFOP |