Kepler-408 b
Kepler-408 b is a terrestrial planet orbiting Kepler-408 in the constellation Draco. It lies about 290 light-years from Earth and was discovered in 2014 using the transit method.
How Big Is Kepler-408 b?
Kepler-408 b has a radius of 0.82 times that of Earth. Its mass is 5.0 times that of Earth.
Is Kepler-408 b in the Habitable Zone?
The position of Kepler-408 b relative to the habitable zone of Kepler-408 cannot be precisely determined from the available orbital data.
Habitable zone of Kepler-408: 1.010–2.361 AU (conservative: 1.279–2.238 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-408 b — one full orbit around Kepler-408 — lasts 2.47 Earth days, shorter than Mercury's 88-day year.
How Was Kepler-408 b Discovered?
Kepler-408 b was discovered in 2014 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-408 b?
Kepler-408 b is 289.6 light-years (88.8 parsecs) from Earth. Light arriving here tonight left the planet around the year 1737. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 5,096,960 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-408 b scores 0.29, ranking #1,829 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-408
Kepler-408
- Surface temperature
- 6,104 K (Sun: 5,772 K)
- Mass
- 1.08 M☉
- Radius
- 1.23 R☉
- Age
- 6.7 billion years (Sun: 4.6)
Planetary System
Kepler-408 b is the only planet known to orbit Kepler-408 so far.
Kepler-408 b — Complete Data
| Radius | 0.820 Earth radii (0.073 Jupiter radii) |
|---|---|
| Mass | 5.00 Earth masses (0.016 Jupiter masses) |
| Orbital period | 2.47 days |
| Earth Similarity Index | 0.29 |
| Distance from Earth | 289.6 light-years (88.8 parsecs) |
| Constellation | Draco |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2014 |
Data: NASA Exoplanet Archive, last updated 2016-10-12. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-408 b
Is Kepler-408 b habitable?
Kepler-408 b is not known to orbit within the habitable zone of Kepler-408, and as a terrestrial planet it is an unlikely candidate for life as we know it.
How far away is Kepler-408 b?
Kepler-408 b is about 290 light-years from Earth in the constellation Draco. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 5,096,960 years to get there.
How big is Kepler-408 b compared to Earth?
Kepler-408 b has 0.82 times the radius of Earth and about 5.0 times its mass.
How long is a year on Kepler-408 b?
One orbit around Kepler-408 takes 2.5 Earth days — short enough that 148 of its years would fit into one Earth year.
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