The star
The star
HD 106315
- Type
- F5 V
- Surface
- ≈ 6,327 K
- Size
- 1.30 × the Sun
- Mass
- 1.09 × the Sun
- Brightness
- 2.48 × the Sun
- Habitable zone
- 1.14–2.66 AU
The planets
HD 106315
HD 106315 b
- Year
- 9.55 days
- Distance from star
- 0.0907 AU
- Mass
- 13 Earths
- Size
- 2.4 × Earth
- Temperature
- ≈ 1153 K (+880 °C)
- Found
- 2017, transit (K2)
HD 106315
HD 106315 c
- Year
- 21.06 days
- Distance from star
- 0.154 AU
- Mass
- 15 Earths
- Size
- 4.3 × Earth
- Temperature
- ≈ 886 K (+613 °C)
- Found
- 2017, 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.