Kepler-449 b
Kepler-449 b is a mini-Neptune orbiting Kepler-449 in the constellation Cygnus. It lies about 789 light-years from Earth and was discovered in 2015 using the transit method.
How Big Is Kepler-449 b?
Kepler-449 b has a radius of 2.06 times that of Earth.
Is Kepler-449 b in the Habitable Zone?
The position of Kepler-449 b relative to the habitable zone of Kepler-449 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on Kepler-449 b — one full orbit around Kepler-449 — lasts 12.6 Earth days, shorter than Mercury's 88-day year. Its orbit is nearly circular (eccentricity 0.030).
How Was Kepler-449 b Discovered?
Kepler-449 b was discovered in 2015 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-449 b?
Kepler-449 b is 789.1 light-years (241.9 parsecs) from Earth. Light arriving here tonight left the planet around the year 1237. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 13,888,160 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-449 b scores 0.26, ranking #2,888 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-449
Kepler-449
- Surface temperature
- 5,649 K (Sun: 5,772 K)
The Kepler-449 Planetary System
Kepler-449 b is one of 2 known planets in the Kepler-449 system. Its siblings:
- Kepler-449 c (Mini Neptune)
Kepler-449 b — Complete Data
| Radius | 2.056 Earth radii (0.183 Jupiter radii) |
|---|---|
| Orbital period | 12.58 days |
| Eccentricity | 0.030 |
| Earth Similarity Index | 0.26 |
| Distance from Earth | 789.1 light-years (241.9 parsecs) |
| Constellation | Cygnus |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2015 |
Data: NASA Exoplanet Archive, last updated 2015-05-21. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-449 b
Is Kepler-449 b habitable?
Kepler-449 b is not known to orbit within the habitable zone of Kepler-449, and as a mini-Neptune it is an unlikely candidate for life as we know it.
How far away is Kepler-449 b?
Kepler-449 b is about 789 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 13,888,160 years to get there.
How big is Kepler-449 b compared to Earth?
Kepler-449 b has 2.06 times the radius of Earth.
How long is a year on Kepler-449 b?
One orbit around Kepler-449 takes 12.6 Earth days — short enough that 29 of its years would fit into one Earth year.
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