The star
The star
Kepler-104
- Type
- yellow star
- Surface
- ≈ 5,711 K
- Size
- 1.35 × the Sun
- Mass
- 0.82 × the Sun
- Brightness
- 1.23 × the Sun
- Habitable zone
- 0.835–1.97 AU
The planets
Kepler-104
Kepler-104 b
- Year
- 11.43 days
- Distance from star
- 0.094 AU
- Mass
- 20 Earths
- Size
- 3.1 × Earth
- Temperature
- ≈ 852 K (+579 °C)
- Found
- 2014, transit (Kepler)
Kepler-104
Kepler-104 c
- Year
- 23.67 days
- Distance from star
- 0.153 AU
- Mass
- at least 7.1 Earths
- Size
- 3.1 × Earth
- Temperature
- ≈ 668 K (+395 °C)
- Found
- 2014, transit (Kepler)
Kepler-104
Kepler-104 d
- Year
- 51.76 days
- Distance from star
- 0.257 AU
- Mass
- at least 5.5 Earths
- Size
- 3.6 × Earth
- Temperature
- ≈ 515 K (+242 °C)
- Found
- 2014, transit (Kepler)
Masses found by the wobble method are minimums, because the orbit's tilt is unknown. Temperatures are equilibrium estimates for a bare planet, before any atmosphere.
How we know
The shadow
The planet passes in front of its star and dims it by a fraction of a percent, every orbit. The dip gives the planet's size and year.
Sources
- Planet and star parameters: NASA Exoplanet Archive, Planetary Systems Composite Parameters, retrieved 1 Nov 2026. This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with NASA under the Exoplanet Exploration Program.
- Position: HYG Database v4.1 (CC BY-SA 4.0).
- Habitable zone: a simple estimate from the star's brightness (√L × 0.95 to 1.67 AU), shown as a guide.