The star
The star
K2-58
- Type
- yellow star
- Surface
- ≈ 5,413 K
- Size
- 0.86 × the Sun
- Mass
- 0.89 × the Sun
- Brightness
- 0.4 × the Sun
- Habitable zone
- 0.485–1.16 AU
The planets
K2-58
K2-58 c
- Year
- 2.54 days
- Distance from star
- 0.035 AU
- Mass
- 3.3 Earths
- Size
- 1.6 × Earth
- Temperature
- ≈ 1294 K (+1021 °C)
- Found
- 2016, transit (K2)
K2-58
K2-58 b
- Year
- 7.05 days
- Distance from star
- 0.0692 AU
- Mass
- 7.7 Earths
- Size
- 2.7 × Earth
- Temperature
- ≈ 920 K (+647 °C)
- Found
- 2016, transit (K2)
K2-58
K2-58 d
- Year
- 22.88 days
- Distance from star
- 0.152 AU
- Mass
- 3.6 Earths
- Size
- 1.7 × Earth
- Temperature
- ≈ 621 K (+348 °C)
- Found
- 2016, 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.