The star
The star
K2-290
- Type
- white star
- Surface
- ≈ 6,302 K
- Size
- 1.51 × the Sun
- Mass
- 1.19 × the Sun
- Brightness
- 2.63 × the Sun
- Habitable zone
- 1.18–2.75 AU
The planets
K2-290
K2-290 b
- Year
- 9.21 days
- Distance from star
- 0.0923 AU
- Mass
- 11 Earths
- Size
- 3.1 × Earth
- Temperature
- ≈ 1230 K (+957 °C)
- Found
- 2019, transit (K2)
K2-290
K2-290 c
- Year
- 48.37 days
- Distance from star
- 0.305 AU
- Mass
- 2.5e+02 Earths
- Size
- 11 × Earth
- Temperature
- ≈ 676 K (+403 °C)
- Found
- 2019, transit (K2)
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.