Kepler-411 b
Kepler-411 b is a super-Earth orbiting the K2 V star Kepler-411 in the constellation Cygnus. It lies about 501 light-years from Earth and was discovered in 2013 using the transit method.
How Big Is Kepler-411 b?
Kepler-411 b has a radius of 2.40 times that of Earth. Its mass is 25.6 times that of Earth, giving it a density of 10.30 g/cm³ — comparable to rocky planets like Earth (5.51 g/cm³).
Is Kepler-411 b in the Habitable Zone?
The position of Kepler-411 b relative to the habitable zone of Kepler-411 cannot be precisely determined from the available orbital data.
Temperature on Kepler-411 b
The equilibrium temperature of Kepler-411 b is about 1,138 K (865 °C) — hot enough to melt many metals. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C.
Orbit and Year Length
A year on Kepler-411 b — one full orbit around Kepler-411 — lasts 3.01 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.038 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.15).
How Was Kepler-411 b Discovered?
Kepler-411 b was discovered in 2013 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-411 b?
Kepler-411 b is 501.2 light-years (153.7 parsecs) from Earth. Light arriving here tonight left the planet around the year 1525. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 8,821,120 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-411 b scores 0.24, ranking #3,272 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-411
Kepler-411 b belongs to a system of 2 stars; it orbits Kepler-411.
Kepler-411
- Spectral type
- K2 V
- Mass
- 0.87 M☉
- Radius
- 0.82 R☉
- Age
- 0.2 billion years (Sun: 4.6)
The Kepler-411 Planetary System
Kepler-411 b is one of 4 known planets in the Kepler-411 system. Its siblings:
- Kepler-411 c (Neptune-like)
- Kepler-411 d (Sub Neptune)
- Kepler-411 e (Neptune-like)
Kepler-411 b — Complete Data
| Radius | 2.401 Earth radii (0.214 Jupiter radii) |
|---|---|
| Mass | 25.60 Earth masses (0.081 Jupiter masses) |
| Density | 10.30 g/cm³ (Earth: 5.51) |
| Orbital period | 3.01 days |
| Orbital distance | 0.038 AU |
| Eccentricity | 0.146 |
| Equilibrium temperature | 1,138 K (865 °C) |
| Earth Similarity Index | 0.24 |
| Distance from Earth | 501.2 light-years (153.7 parsecs) |
| Constellation | Cygnus |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2013 |
Data: NASA Exoplanet Archive, last updated 2019-07-03. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-411 b
Is Kepler-411 b habitable?
Kepler-411 b is not known to orbit within the habitable zone of Kepler-411, and as a super-Earth it is an unlikely candidate for life as we know it.
How far away is Kepler-411 b?
Kepler-411 b is about 501 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 8,821,120 years to get there.
How big is Kepler-411 b compared to Earth?
Kepler-411 b has 2.40 times the radius of Earth and about 25.6 times its mass.
How long is a year on Kepler-411 b?
One orbit around Kepler-411 takes 3.0 Earth days — short enough that 122 of its years would fit into one Earth year.
Explore Kepler-411 b in the app
Browse, filter and compare 6,000+ exoplanets on iPhone, iPad and Apple Watch — with habitable-zone views, widgets and offline data.
