Kepler-799 c
Kepler-799 c is a mini-Neptune orbiting Kepler-799 in the constellation Lyra. It lies about 4,922 light-years from Earth and was discovered in 2021 using the transit method.
How Big Is Kepler-799 c?
Kepler-799 c has a radius of 2.78 times that of Earth.
Is Kepler-799 c in the Habitable Zone?
The position of Kepler-799 c relative to the habitable zone of Kepler-799 cannot be precisely determined from the available orbital data.
Habitable zone of Kepler-799: 1.131–2.679 AU (conservative: 1.432–2.539 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-799 c — one full orbit around Kepler-799 — lasts 15.2 Earth days, shorter than Mercury's 88-day year.
How Was Kepler-799 c Discovered?
Kepler-799 c was discovered in 2021 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-799 c?
Kepler-799 c is 4,922.0 light-years (1,509.1 parsecs) from Earth. Light arriving here tonight left the planet about 4,922 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 86,627,200 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-799 c scores 0.23, ranking #3,553 of 5,565 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-799
Kepler-799
- Surface temperature
- 5,588 K (Sun: 5,772 K)
- Mass
- 1.03 M☉
- Radius
- 1.59 R☉
The Kepler-799 Planetary System
Kepler-799 c is one of 2 known planets in the Kepler-799 system. Its siblings:
- Kepler-799 b (Cold Gas Giant)
Kepler-799 c — Complete Data
| Radius | 2.781 Earth radii (0.248 Jupiter radii) |
|---|---|
| Orbital period | 15.19 days |
| Earth Similarity Index | 0.23 |
| Distance from Earth | 4,922.0 light-years (1,509.1 parsecs) |
| Constellation | Lyra |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2021-12-05. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-799 c
Is Kepler-799 c habitable?
Kepler-799 c is not known to orbit within the habitable zone of Kepler-799, and as a mini-Neptune it is an unlikely candidate for life as we know it.
How far away is Kepler-799 c?
Kepler-799 c is about 4,922 light-years from Earth in the constellation Lyra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 86,627,200 years to get there.
How big is Kepler-799 c compared to Earth?
Kepler-799 c has 2.78 times the radius of Earth.
How long is a year on Kepler-799 c?
One orbit around Kepler-799 takes 15.2 Earth days — short enough that 24 of its years would fit into one Earth year.
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