The star
The star
Kepler-298
- Type
- orange dwarf
- Surface
- ≈ 4,465 K
- Size
- 0.58 × the Sun
- Mass
- 0.66 × the Sun
- Brightness
- 0.185 × the Sun
- Habitable zone
- 0.344–0.852 AU
The planets
Kepler-298
Kepler-298 b
- Year
- 10.48 days
- Distance from star
- 0.08 AU
- Mass
- 4.5 Earths
- Size
- 2 × Earth
- Temperature
- ≈ 540 K (+267 °C)
- Found
- 2014, transit (Kepler)
Kepler-298
Kepler-298 c
- Year
- 22.93 days
- Distance from star
- 0.136 AU
- Mass
- 4.4 Earths
- Size
- 1.9 × Earth
- Temperature
- ≈ 416 K (+143 °C)
- Found
- 2014, transit (Kepler)
Kepler-298
Kepler-298 d
- Year
- 77.47 days
- Distance from star
- 0.305 AU
- Mass
- 6.8 Earths
- Size
- 2.5 × Earth
- Temperature
- ≈ 277 K (+4 °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.