The star
The star
Kepler-102
- Type
- orange dwarf
- Surface
- ≈ 4,909 K
- Size
- 0.72 × the Sun
- Mass
- 0.80 × the Sun
- Brightness
- 0.26 × the Sun
- Habitable zone
- 0.401–0.974 AU
The planets
Kepler-102
Kepler-102 b
- Year
- 5.29 days
- Distance from star
- 0.0552 AU
- Mass
- 1.1 Earths
- Size
- 0.46 × Earth
- Temperature
- ≈ 857 K (+584 °C)
- Found
- 2014, transit (Kepler)
Kepler-102
Kepler-102 c
- Year
- 7.07 days
- Distance from star
- 0.067 AU
- Mass
- 1.7 Earths
- Size
- 0.57 × Earth
- Temperature
- ≈ 777 K (+504 °C)
- Found
- 2014, transit (Kepler)
Kepler-102
Kepler-102 d
- Year
- 10.31 days
- Distance from star
- 0.0862 AU
- Mass
- 3 Earths
- Size
- 1.2 × Earth
- Temperature
- ≈ 686 K (+413 °C)
- Found
- 2014, transit (Kepler)
Kepler-102
Kepler-102 e
- Year
- 16.15 days
- Distance from star
- 0.116 AU
- Mass
- 4.7 Earths
- Size
- 2.2 × Earth
- Temperature
- ≈ 590 K (+317 °C)
- Found
- 2013, transit (Kepler)
Kepler-102
Kepler-102 f
- Year
- 27.45 days
- Distance from star
- 0.166 AU
- Mass
- 4.3 Earths
- Size
- 0.86 × Earth
- Temperature
- ≈ 495 K (+222 °C)
- Found
- 2014, 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.