KELT-9 b
A confirmed exoplanet orbiting KELT-9.
Compared with Earth
- Size
- About 22 times Earth's width.
- Mass
- About 915 times Earth's mass.
- Temperature
- About 3,648 °C (6,598 °F) from starlight alone, against -18 °C (-1 °F) for Earth measured the same way.
- Year
- A year here lasts about 1.5 Earth days.
Planet
- Radius
- 21.7 × Earth
- Mass
- 915.3 × Earth
- Density
- 0.491 g/cm³
- Equilibrium temperature
- 3,921 K
- Starlight received
- Unknown
- Orbital period
- 1.481 days
- Average distance from its star
- 0.03368 AU
Star
- Host star
- KELT-9
- Spectral class
- A — white
- Surface temperature
- 9,270 K
- Radius
- 2.418 × Sun
- Mass
- 2.32 × Sun
- Age
- 0.45 billion years
System
- Distance from Earth
- 666.8 light-years (204.5 parsecs)
- Stars in system
- 2
- Known planets
- 1
Discovery
- Year
- 2017
- Method
- Transit
- Facility
- KELT-North
Data from the NASA Exoplanet Archive, synced October 14, 2026.