Kepler-158 d
Kepler-158 d is a terrestrial planet orbiting the K star Kepler-158 in the constellation Lyra. It lies about 1,028 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is Kepler-158 d?
Kepler-158 d has a radius of 0.43 times that of Earth.
Is Kepler-158 d in the Habitable Zone?
The position of Kepler-158 d relative to the habitable zone of Kepler-158 cannot be precisely determined from the available orbital data.
Habitable zone of Kepler-158: 0.377–0.917 AU (conservative: 0.478–0.869 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
See the full interactive habitable-zone view in the Exoplanet Explorer app ›
Orbit and Year Length
A year on Kepler-158 d — one full orbit around Kepler-158 — lasts just 15.5 hours, shorter than Mercury's 88-day year.
How Was Kepler-158 d Discovered?
Kepler-158 d was discovered in 2024 using the transit method, with observations from Kepler.
The transit method watches a star for the tiny, regular dip in brightness that occurs when a planet crosses in front of it. The depth and timing of these dips reveal the planet's size and orbital period.
How Far Away Is Kepler-158 d?
Kepler-158 d is 1,028.0 light-years (315.2 parsecs) from Earth. Light arriving here tonight left the planet about 1,028 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 18,092,800 years to make the journey.
The Host Star: Kepler-158
Kepler-158
- Spectral type
- K
- Surface temperature
- 4,896 K (Sun: 5,772 K)
- Mass
- 0.66 M☉
- Radius
- 0.67 R☉
The Kepler-158 Planetary System
Kepler-158 d is one of 3 known planets in the Kepler-158 system. Its siblings:
- Kepler-158 b (Mini Neptune)
- Kepler-158 c (Super Earth)
Kepler-158 d — Complete Data
| Radius | 0.430 Earth radii (0.038 Jupiter radii) |
|---|---|
| Orbital period | 0.65 days |
| Distance from Earth | 1,028.0 light-years (315.2 parsecs) |
| Constellation | Lyra |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2024-10-14. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-158 d
Is Kepler-158 d habitable?
Kepler-158 d is not known to orbit within the habitable zone of Kepler-158, and as a terrestrial planet it is an unlikely candidate for life as we know it.
How far away is Kepler-158 d?
Kepler-158 d is about 1,028 light-years from Earth in the constellation Lyra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 18,092,800 years to get there.
How big is Kepler-158 d compared to Earth?
Kepler-158 d has 0.43 times the radius of Earth.
How long is a year on Kepler-158 d?
One orbit around Kepler-158 takes 0.6 Earth days — short enough that 566 of its years would fit into one Earth year.
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