Kepler-88 d
Kepler-88 d is a cold gas giant orbiting KOI-142 in the constellation Lyra. It lies about 1,229 light-years from Earth and was discovered in 2020 using the radial velocity method.
Is Kepler-88 d in the Habitable Zone?
The position of Kepler-88 d relative to the habitable zone of KOI-142 cannot be precisely determined from the available orbital data.
Habitable zone of KOI-142: 0.614–1.459 AU (conservative: 0.777–1.383 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-88 d — one full orbit around KOI-142 — lasts 1,403.0 Earth days, longer than an Earth year. Its orbit is highly elliptical (eccentricity 0.41), swinging dramatically closer to and farther from its star.
How Was Kepler-88 d Discovered?
Kepler-88 d was discovered in 2020 using the radial velocity method, with observations from W. M. Keck Observatory.
The radial velocity method measures the subtle wobble of a star caused by the gravitational pull of an orbiting planet, visible as periodic shifts in the star's light spectrum. The size of the wobble reveals the planet's minimum mass.
How Far Away Is Kepler-88 d?
Kepler-88 d is 1,229.2 light-years (376.9 parsecs) from Earth. Light arriving here tonight left the planet about 1,229 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 21,633,920 years to make the journey.
Earth Similarity Index
The Earth Similarity Index (ESI) scores how physically similar a planet is to Earth, from 0 to 1, based on radius, density, escape velocity and surface temperature. Kepler-88 d scores 0.17, ranking #4,071 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: KOI-142
KOI-142
- Surface temperature
- 5,466 K (Sun: 5,772 K)
- Mass
- 0.99 M☉
- Radius
- 0.90 R☉
The KOI-142 Planetary System
Kepler-88 d is one of 3 known planets in the KOI-142 system. Its siblings:
Kepler-88 d — Complete Data
| Mass (best estimate) | 965.15 Earth masses |
|---|---|
| Orbital period | 1,403.00 days |
| Eccentricity | 0.410 |
| Earth Similarity Index | 0.17 |
| Distance from Earth | 1,229.2 light-years (376.9 parsecs) |
| Constellation | Lyra |
| Discovery method | Radial Velocity |
| Discovery facility | W. M. Keck Observatory |
| Discovery year | 2020 |
Data: NASA Exoplanet Archive, last updated 2020-05-28. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-88 d
Is Kepler-88 d habitable?
Kepler-88 d is not known to orbit within the habitable zone of KOI-142, and as a cold gas giant it is an unlikely candidate for life as we know it.
How far away is Kepler-88 d?
Kepler-88 d is about 1,229 light-years from Earth in the constellation Lyra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 21,633,920 years to get there.
How long is a year on Kepler-88 d?
One orbit around KOI-142 takes 1,403.0 Earth days.
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