The star
The star
K2-268
- Type
- orange dwarf
- Surface
- ≈ 5,106 K
- Size
- 0.78 × the Sun
- Mass
- 0.84 × the Sun
- Brightness
- 0.372 × the Sun
- Habitable zone
- 0.475–1.14 AU
The planets
K2-268
K2-268 b
- Year
- 2.15 days
- Distance from star
- 0.0308 AU
- Mass
- 2.9 Earths
- Size
- 1.5 × Earth
- Temperature
- ≈ 1136 K (+863 °C)
- Found
- 2018, transit (K2)
K2-268
K2-268 c
- Year
- 9.33 days
- Distance from star
- 0.0819 AU
- Mass
- 7.7 Earths
- Size
- 2.7 × Earth
- Temperature
- ≈ 696 K (+423 °C)
- Found
- 2018, transit (K2)
K2-268
K2-268 d
- Year
- 4.53 days
- Distance from star
- 0.0505 AU
- Mass
- 2.8 Earths
- Size
- 1.5 × Earth
- Temperature
- ≈ 888 K (+615 °C)
- Found
- 2021, transit (K2)
K2-268
K2-268 e
- Year
- 6.13 days
- Distance from star
- 0.0619 AU
- Mass
- 2.3 Earths
- Size
- 1.3 × Earth
- Temperature
- ≈ 801 K (+528 °C)
- Found
- 2021, transit (K2)
K2-268
K2-268 f
- Year
- 26.27 days
- Distance from star
- 0.163 AU
- Mass
- 5.6 Earths
- Size
- 2.2 × Earth
- Temperature
- ≈ 492 K (+219 °C)
- Found
- 2021, 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.