KOI-1257 b
A confirmed exoplanet orbiting KOI-1257.
Compared with Earth
- Size
- About 11 times Earth's width.
- Mass
- About 461 times Earth's mass.
- Temperature
- About 238 °C (460 °F) from starlight alone, against -18 °C (-1 °F) for Earth measured the same way.
- Year
- A year here lasts about 87 Earth days.
Planet
- Radius
- 10.54 × Earth
- Mass
- 460.8 × Earth
- Density
- 2.1 g/cm³
- Equilibrium temperature
- 511 K
- Starlight received
- Unknown
- Orbital period
- 86.65 days
- Average distance from its star
- 0.382 AU
Star
- Host star
- KOI-1257
- Spectral class
- G — sun-like
- Surface temperature
- 5,520 K
- Radius
- 1.13 × Sun
- Mass
- 0.99 × Sun
- Age
- 9.3 billion years
System
- Distance from Earth
- Unknown
- Stars in system
- 2
- Known planets
- 1
Discovery
- Year
- 2014
- Method
- Transit
- Facility
- Kepler
Data from the NASA Exoplanet Archive, synced October 14, 2026.