The star
The star
Kepler-1254
- Type
- orange dwarf
- Surface
- ≈ 4,985 K
- Size
- 0.75 × the Sun
- Mass
- 0.78 × the Sun
- Brightness
- 0.268 × the Sun
- Habitable zone
- 0.406–0.981 AU
The planets
Kepler-1254
Kepler-1254 c
- Year
- 3.60 days
- Distance from star
- 0.0422 AU
- Mass
- 2.2 Earths
- Size
- 1.3 × Earth
- Temperature
- ≈ 927 K (+654 °C)
- Found
- 2016, transit (Kepler)
Kepler-1254
Kepler-1254 d
- Year
- 5.73 days
- Distance from star
- 0.0575 AU
- Mass
- 2.3 Earths
- Size
- 1.3 × Earth
- Temperature
- ≈ 794 K (+521 °C)
- Found
- 2016, transit (Kepler)
Kepler-1254
Kepler-1254 b
- Year
- 9.99 days
- Distance from star
- 0.0833 AU
- Mass
- 3 Earths
- Size
- 1.6 × Earth
- Temperature
- ≈ 660 K (+387 °C)
- Found
- 2016, 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.