The star
The star
Kepler-1987
- Type
- orange dwarf
- Surface
- ≈ 4,769 K
- Size
- 0.71 × the Sun
- Mass
- 0.80 × the Sun
- Brightness
- 0.242 × the Sun
- Habitable zone
- 0.389–0.95 AU
The planets
Kepler-1987
Kepler-1987 b
- Year
- 2.35 days
- Distance from star
- 0.0318 AU
- Mass
- 2 Earths
- Size
- 1.2 × Earth
- Temperature
- ≈ 997 K (+724 °C)
- Found
- 2023, transit (Kepler)
Kepler-1987
Kepler-1987 c
- Year
- 3.65 days
- Distance from star
- 0.0427 AU
- Mass
- 2.3 Earths
- Size
- 1.3 × Earth
- Temperature
- ≈ 860 K (+587 °C)
- Found
- 2023, transit (Kepler)
Kepler-1987
Kepler-1987 d
- Year
- 5.64 days
- Distance from star
- 0.0571 AU
- Mass
- 7.6 Earths
- Size
- 2.7 × Earth
- Temperature
- ≈ 744 K (+471 °C)
- Found
- 2023, transit (Kepler)
Kepler-1987
Kepler-1987 e
- Year
- 8.74 days
- Distance from star
- 0.0765 AU
- Mass
- 4.3 Earths
- Size
- 1.9 × Earth
- Temperature
- ≈ 643 K (+370 °C)
- Found
- 2023, 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.