HAT-P-1 b
A confirmed exoplanet orbiting HAT-P-1.
Compared with Earth
- Size
- About 15 times Earth's width.
- Mass
- About 167 times Earth's mass.
- Temperature
- About 1,049 °C (1,920 °F) from starlight alone, against -18 °C (-1 °F) for Earth measured the same way.
- Year
- A year here lasts about 4.5 Earth days.
Planet
- Radius
- 14.78 × Earth
- Mass
- 166.9 × Earth
- Density
- 0.282 g/cm³
- Equilibrium temperature
- 1,322 K
- Starlight received
- Unknown
- Orbital period
- 4.465 days
- Average distance from its star
- 0.05561 AU
Star
- Host star
- HAT-P-1
- Spectral class
- G — sun-like
- Surface temperature
- 5,980 K
- Radius
- 1.174 × Sun
- Mass
- 1.151 × Sun
- Age
- Unknown
System
- Distance from Earth
- 518.5 light-years (159 parsecs)
- Stars in system
- 2
- Known planets
- 1
Discovery
- Year
- 2006
- Method
- Transit
- Facility
- HATNet
Data from the NASA Exoplanet Archive, synced October 14, 2026.