Kepler-11 g
Kepler-11 g is a super-Earth orbiting Kepler-11 in the constellation Cygnus. It lies about 2,108 light-years from Earth and was discovered in 2010 using the transit method.
How Big Is Kepler-11 g?
Kepler-11 g has a radius of 3.33 times that of Earth. Its mass is 25.0 times that of Earth, giving it a density of 4.00 g/cm³ — between that of rocky and gaseous planets.
Is Kepler-11 g in the Habitable Zone?
Kepler-11 g orbits inside the inner edge of the habitable zone of Kepler-11. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Kepler-11: 0.773–1.827 AU (conservative: 0.979–1.732 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-11 g — one full orbit around Kepler-11 — lasts 118.4 Earth days, between the years of Mercury (88 days) and Earth (365 days). It orbits at an average distance of 0.466 AU — comparable to the inner Solar System. Its orbit is mildly elliptical (eccentricity 0.15).
How Was Kepler-11 g Discovered?
Kepler-11 g was discovered in 2010 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-11 g?
Kepler-11 g is 2,108.1 light-years (646.3 parsecs) from Earth. Light arriving here tonight left the planet about 2,108 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 37,102,560 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-11 g scores 0.36, ranking #670 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-11
Kepler-11
- Surface temperature
- 5,663 K (Sun: 5,772 K)
- Mass
- 0.96 M☉
- Radius
- 1.07 R☉
- Age
- 8.5 billion years (Sun: 4.6)
The Kepler-11 Planetary System
Kepler-11 g is one of 6 known planets in the Kepler-11 system. Its siblings:
- Kepler-11 b (Mini Neptune)
- Kepler-11 c (Puffy Planet)
- Kepler-11 d (Puffy Planet)
- Kepler-11 e (Neptune-like)
- Kepler-11 f (Puffy Planet)
Kepler-11 g — Complete Data
| Radius | 3.330 Earth radii (0.297 Jupiter radii) |
|---|---|
| Mass | 25.00 Earth masses (0.079 Jupiter masses) |
| Density | 4.00 g/cm³ (Earth: 5.51) |
| Orbital period | 118.38 days |
| Orbital distance | 0.466 AU |
| Eccentricity | 0.150 |
| Earth Similarity Index | 0.36 |
| Distance from Earth | 2,108.1 light-years (646.3 parsecs) |
| Constellation | Cygnus |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2010 |
Data: NASA Exoplanet Archive, last updated 2014-05-14. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-11 g
Is Kepler-11 g habitable?
No — Kepler-11 g orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is Kepler-11 g?
Kepler-11 g is about 2,108 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 37,102,560 years to get there.
How big is Kepler-11 g compared to Earth?
Kepler-11 g has 3.33 times the radius of Earth and about 25.0 times its mass.
How long is a year on Kepler-11 g?
One orbit around Kepler-11 takes 118.4 Earth days.
Explore Kepler-11 g in the app
Browse, filter and compare 6,000+ exoplanets on iPhone, iPad and Apple Watch — with habitable-zone views, widgets and offline data.
