The star
The star
Kepler-55
- Type
- orange dwarf
- Surface
- ≈ 4,362 K
- Size
- 0.58 × the Sun
- Mass
- 0.62 × the Sun
- Brightness
- 0.172 × the Sun
- Habitable zone
- 0.334–0.83 AU
The planets
Kepler-55
Kepler-55 d
- Year
- 2.21 days
- Distance from star
- 0.029 AU
- Mass
- 3.1 Earths
- Size
- 1.6 × Earth
- Temperature
- ≈ 931 K (+658 °C)
- Found
- 2014, transit (Kepler)
Kepler-55
Kepler-55 e
- Year
- 4.62 days
- Distance from star
- 0.048 AU
- Mass
- 3 Earths
- Size
- 1.6 × Earth
- Temperature
- ≈ 728 K (+455 °C)
- Found
- 2014, transit (Kepler)
Kepler-55
Kepler-55 f
- Year
- 10.20 days
- Distance from star
- 0.081 AU
- Mass
- 3.1 Earths
- Size
- 1.6 × Earth
- Temperature
- ≈ 559 K (+286 °C)
- Found
- 2014, transit (Kepler)
Kepler-55
Kepler-55 b
- Year
- 27.95 days
- Distance from star
- 0.159 AU
- Mass
- 43 Earths
- Size
- 2.4 × Earth
- Temperature
- ≈ 400 K (+127 °C)
- Found
- 2012, transit (Kepler)
Kepler-55
Kepler-55 c
- Year
- 42.15 days
- Distance from star
- 0.209 AU
- Mass
- 70 Earths
- Size
- 2.2 × Earth
- Temperature
- ≈ 349 K (+76 °C)
- Found
- 2012, 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.