KOI-142 b
KOI-142 b is a puffy low-density planet orbiting KOI-142 in the constellation Lyra. It lies about 1,229 light-years from Earth and was discovered in 2013 using the transit method.
How Big Is KOI-142 b?
KOI-142 b has a radius of 3.44 times that of Earth. Its mass is 9.5 times that of Earth, giving it a density of 1.29 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is KOI-142 b in the Habitable Zone?
The position of KOI-142 b 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 KOI-142 b — one full orbit around KOI-142 — lasts 10.9 Earth days, shorter than Mercury's 88-day year. Its orbit is mildly elliptical (eccentricity 0.06).
How Was KOI-142 b Discovered?
KOI-142 b was discovered in 2013 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 KOI-142 b?
KOI-142 b 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. KOI-142 b scores 0.21, ranking #3,780 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
KOI-142 b is one of 3 known planets in the KOI-142 system. Its siblings:
- KOI-142 c (Cold Gas Giant)
- Kepler-88 d (Cold Gas Giant)
KOI-142 b — Complete Data
| Radius | 3.438 Earth radii (0.307 Jupiter radii) |
|---|---|
| Mass | 9.50 Earth masses (0.030 Jupiter masses) |
| Density | 1.29 g/cm³ (Earth: 5.51) |
| Orbital period | 10.92 days |
| Eccentricity | 0.056 |
| Earth Similarity Index | 0.21 |
| Distance from Earth | 1,229.2 light-years (376.9 parsecs) |
| Constellation | Lyra |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2013 |
Data: NASA Exoplanet Archive, last updated 2020-05-28. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About KOI-142 b
Is KOI-142 b habitable?
KOI-142 b is not known to orbit within the habitable zone of KOI-142, and as a puffy low-density planet it is an unlikely candidate for life as we know it.
How far away is KOI-142 b?
KOI-142 b 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 big is KOI-142 b compared to Earth?
KOI-142 b has 3.44 times the radius of Earth and about 9.5 times its mass.
How long is a year on KOI-142 b?
One orbit around KOI-142 takes 10.9 Earth days — short enough that 33 of its years would fit into one Earth year.
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