XO-3 b
A confirmed exoplanet orbiting XO-3.
Compared with Earth
- Size
- About 15 times Earth's width.
- Mass
- About 4,218 times Earth's mass.
- Temperature
- About 1,617 °C (2,942 °F) from starlight alone, against -18 °C (-1 °F) for Earth measured the same way.
- Year
- A year here lasts about 3.2 Earth days.
Planet
- Radius
- 14.8 × Earth
- Mass
- 4,218 × Earth
- Density
- 7.16 g/cm³
- Equilibrium temperature
- 1,890 K
- Starlight received
- Unknown
- Orbital period
- 3.192 days
- Average distance from its star
- 0.04815 AU
Star
- Host star
- XO-3
- Spectral class
- F — yellow-white
- Surface temperature
- 6,970 K
- Radius
- 1.523 × Sun
- Mass
- 1.449 × Sun
- Age
- 0.97 billion years
System
- Distance from Earth
- 694.9 light-years (213.1 parsecs)
- Stars in system
- 1
- Known planets
- 1
Discovery
- Year
- 2007
- Method
- Transit
- Facility
- XO
Data from the NASA Exoplanet Archive, synced October 14, 2026.