Kepler-678 b
Kepler-678 b is a Neptune-like planet orbiting Kepler-678 in the constellation Cygnus. It lies about 5,956 light-years from Earth and was discovered in 2016 using the transit method.
How Big Is Kepler-678 b?
Kepler-678 b has a radius of 5.14 times that of Earth.
Is Kepler-678 b in the Habitable Zone?
The position of Kepler-678 b relative to the habitable zone of Kepler-678 cannot be precisely determined from the available orbital data.
Habitable zone of Kepler-678: 0.633–1.502 AU (conservative: 0.802–1.424 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-678 b — one full orbit around Kepler-678 — lasts 7.28 Earth days, shorter than Mercury's 88-day year.
How Was Kepler-678 b Discovered?
Kepler-678 b was discovered in 2016 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-678 b?
Kepler-678 b is 5,956.1 light-years (1,826.2 parsecs) from Earth. Light arriving here tonight left the planet about 5,956 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 104,827,360 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-678 b scores 0.15, ranking #4,209 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-678
Kepler-678
- Surface temperature
- 5,520 K (Sun: 5,772 K)
- Mass
- 0.94 M☉
- Radius
- 0.91 R☉
- Age
- 4.5 billion years (Sun: 4.6)
Planetary System
Kepler-678 b is the only planet known to orbit Kepler-678 so far.
Kepler-678 b — Complete Data
| Radius | 5.140 Earth radii (0.459 Jupiter radii) |
|---|---|
| Orbital period | 7.28 days |
| Earth Similarity Index | 0.15 |
| Distance from Earth | 5,956.1 light-years (1,826.2 parsecs) |
| Constellation | Cygnus |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2016 |
Data: NASA Exoplanet Archive, last updated 2016-05-06. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-678 b
Is Kepler-678 b habitable?
Kepler-678 b is not known to orbit within the habitable zone of Kepler-678, and as a Neptune-like planet it is an unlikely candidate for life as we know it.
How far away is Kepler-678 b?
Kepler-678 b is about 5,956 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 104,827,360 years to get there.
How big is Kepler-678 b compared to Earth?
Kepler-678 b has 5.14 times the radius of Earth.
How long is a year on Kepler-678 b?
One orbit around Kepler-678 takes 7.3 Earth days — short enough that 50 of its years would fit into one Earth year.
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