Kepler-722 c
Kepler-722 c is a mini-Neptune orbiting Kepler-722 in the constellation Cygnus. It lies about 4,043 light-years from Earth and was discovered in 2016 using the transit method.
How Big Is Kepler-722 c?
Kepler-722 c has a radius of 2.82 times that of Earth.
Is Kepler-722 c in the Habitable Zone?
The position of Kepler-722 c relative to the habitable zone of Kepler-722 cannot be precisely determined from the available orbital data.
Habitable zone of Kepler-722: 0.807–1.898 AU (conservative: 1.022–1.799 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-722 c — one full orbit around Kepler-722 — lasts 105.1 Earth days, between the years of Mercury (88 days) and Earth (365 days).
How Was Kepler-722 c Discovered?
Kepler-722 c 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-722 c?
Kepler-722 c is 4,042.7 light-years (1,239.5 parsecs) from Earth. Light arriving here tonight left the planet about 4,043 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 71,151,520 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-722 c scores 0.44, ranking #377 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-722
Kepler-722
- Surface temperature
- 5,863 K (Sun: 5,772 K)
- Mass
- 1.03 M☉
- Radius
- 1.05 R☉
- Age
- 4.4 billion years (Sun: 4.6)
The Kepler-722 Planetary System
Kepler-722 c is one of 2 known planets in the Kepler-722 system. Its siblings:
- Kepler-722 b (Mini Neptune)
Kepler-722 c — Complete Data
| Radius | 2.820 Earth radii (0.252 Jupiter radii) |
|---|---|
| Orbital period | 105.14 days |
| Earth Similarity Index | 0.44 |
| Distance from Earth | 4,042.7 light-years (1,239.5 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-722 c
Is Kepler-722 c habitable?
Kepler-722 c is not known to orbit within the habitable zone of Kepler-722, and as a mini-Neptune it is an unlikely candidate for life as we know it.
How far away is Kepler-722 c?
Kepler-722 c is about 4,043 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 71,151,520 years to get there.
How big is Kepler-722 c compared to Earth?
Kepler-722 c has 2.82 times the radius of Earth.
How long is a year on Kepler-722 c?
One orbit around Kepler-722 takes 105.1 Earth days.
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