Kepler-647 c
Kepler-647 c is a Neptune-like planet orbiting Kepler-647 in the constellation Lyra. It lies about 3,548 light-years from Earth and was discovered in 2020 using the transit method.
How Big Is Kepler-647 c?
Kepler-647 c has a radius of 4.00 times that of Earth.
Is Kepler-647 c in the Habitable Zone?
The position of Kepler-647 c relative to the habitable zone of Kepler-647 cannot be precisely determined from the available orbital data.
Habitable zone of Kepler-647: 0.859–2.012 AU (conservative: 1.088–1.907 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-647 c — one full orbit around Kepler-647 — lasts 29.7 Earth days, shorter than Mercury's 88-day year.
How Was Kepler-647 c Discovered?
Kepler-647 c was discovered in 2020 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-647 c?
Kepler-647 c is 3,548.2 light-years (1,087.9 parsecs) from Earth. Light arriving here tonight left the planet about 3,548 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 62,448,320 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-647 c scores 0.19, ranking #3,970 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-647
Kepler-647
- Surface temperature
- 6,020 K (Sun: 5,772 K)
- Mass
- 1.03 M☉
- Radius
- 1.07 R☉
- Age
- 4.3 billion years (Sun: 4.6)
The Kepler-647 Planetary System
Kepler-647 c is one of 2 known planets in the Kepler-647 system. Its siblings:
- Kepler-647 b (Terrestrial)
Kepler-647 c — Complete Data
| Radius | 4.001 Earth radii (0.357 Jupiter radii) |
|---|---|
| Orbital period | 29.67 days |
| Earth Similarity Index | 0.19 |
| Distance from Earth | 3,548.2 light-years (1,087.9 parsecs) |
| Constellation | Lyra |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2020 |
Data: NASA Exoplanet Archive, last updated 2020-09-08. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-647 c
Is Kepler-647 c habitable?
Kepler-647 c is not known to orbit within the habitable zone of Kepler-647, and as a Neptune-like planet it is an unlikely candidate for life as we know it.
How far away is Kepler-647 c?
Kepler-647 c is about 3,548 light-years from Earth in the constellation Lyra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 62,448,320 years to get there.
How big is Kepler-647 c compared to Earth?
Kepler-647 c has 4.00 times the radius of Earth.
How long is a year on Kepler-647 c?
One orbit around Kepler-647 takes 29.7 Earth days — short enough that 12 of its years would fit into one Earth year.
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