HR 858 b
A confirmed exoplanet orbiting HR 858.
Compared with Earth
- Size
- About 2 times Earth's width.
- Mass
- About 3.6 times Earth's mass.
- Temperature
- About 1,279 °C (2,334 °F) from starlight alone, against -18 °C (-1 °F) for Earth measured the same way.
- Year
- A year here lasts about 3.6 Earth days.
Planet
- Radius
- 2.004 × Earth
- Mass
- 3.55 × Earth
- Density
- 2.44 g/cm³
- Equilibrium temperature
- 1,552 K
- Starlight received
- Unknown
- Orbital period
- 3.585 days
- Average distance from its star
- 0.04888 AU
Star
- Host star
- HR 858
- Spectral class
- F — yellow-white
- Surface temperature
- 6,354 K
- Radius
- 1.258 × Sun
- Mass
- 1.204 × Sun
- Age
- 2 billion years
System
- Distance from Earth
- 104.3 light-years (31.96 parsecs)
- Stars in system
- 2
- Known planets
- 3
Discovery
- Year
- 2019
- Method
- Transit
- Facility
- Transiting Exoplanet Survey Satellite (TESS)
Data from the NASA Exoplanet Archive, synced October 14, 2026.