HD 21520 b
A confirmed exoplanet orbiting HD 21520.
Compared with Earth
- Size
- About 2.7 times Earth's width.
- Mass
- About 18 times Earth's mass.
- Temperature
- About 364 °C (687 °F) from starlight alone, against -18 °C (-1 °F) for Earth measured the same way.
- Year
- A year here lasts about 25 Earth days.
Planet
- Radius
- 2.697 × Earth
- Mass
- 17.7 × Earth
- Density
- 1.35 g/cm³
- Equilibrium temperature
- 637 K
- Starlight received
- Unknown
- Orbital period
- 25.13 days
- Average distance from its star
- 0.1726 AU
Star
- Host star
- HD 21520
- Spectral class
- G — sun-like
- Surface temperature
- 5,871 K
- Radius
- 1.044 × Sun
- Mass
- 1.09 × Sun
- Age
- 5.3 billion years
System
- Distance from Earth
- 258.3 light-years (79.21 parsecs)
- Stars in system
- 1
- Known planets
- 1
Discovery
- Year
- 2024
- Method
- Transit
- Facility
- Transiting Exoplanet Survey Satellite (TESS)
Data from the NASA Exoplanet Archive, synced October 14, 2026.