HAT-P-21 b
A confirmed exoplanet orbiting HAT-P-21.
Compared with Earth
- Size
- About 12 times Earth's width.
- Mass
- About 1,548 times Earth's mass.
- Year
- A year here lasts about 4.1 Earth days.
Planet
- Radius
- 12.44 × Earth
- Mass
- 1,548 × Earth
- Density
- Unknown
- Equilibrium temperature
- Unknown
- Starlight received
- Unknown
- Orbital period
- 4.124 days
- Average distance from its star
- Unknown
Star
- Host star
- HAT-P-21
- Spectral class
- G — sun-like
- Surface temperature
- 5,588 K
- Radius
- 1.21 × Sun
- Mass
- 1.24 × Sun
- Age
- Unknown
System
- Distance from Earth
- 904.4 light-years (277.3 parsecs)
- Stars in system
- 1
- Known planets
- 1
Discovery
- Year
- 2010
- Method
- Transit
- Facility
- HATNet
Data from the NASA Exoplanet Archive, synced October 14, 2026.