Kepler-1171 b
Kepler-1171 b is a mini-Neptune orbiting Kepler-1171 in the constellation Cygnus. It lies about 1,869 light-years from Earth and was discovered in 2016 using the transit method.
How Big Is Kepler-1171 b?
Kepler-1171 b has a radius of 2.56 times that of Earth.
Is Kepler-1171 b in the Habitable Zone?
The position of Kepler-1171 b relative to the habitable zone of Kepler-1171 cannot be precisely determined from the available orbital data.
Habitable zone of Kepler-1171: 2.023–4.668 AU (conservative: 2.563–4.426 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-1171 b — one full orbit around Kepler-1171 — lasts just 34.6 hours, shorter than Mercury's 88-day year.
How Was Kepler-1171 b Discovered?
Kepler-1171 b was discovered in 2016 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-1171 b?
Kepler-1171 b is 1,868.9 light-years (573.0 parsecs) from Earth. Light arriving here tonight left the planet about 1,869 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 32,892,640 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-1171 b scores 0.23, ranking #3,534 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-1171
Kepler-1171
- Surface temperature
- 7,044 K (Sun: 5,772 K)
- Mass
- 1.58 M☉
- Radius
- 1.95 R☉
- Age
- 1.4 billion years (Sun: 4.6)
Planetary System
Kepler-1171 b is the only planet known to orbit Kepler-1171 so far.
Kepler-1171 b — Complete Data
| Radius | 2.560 Earth radii (0.228 Jupiter radii) |
|---|---|
| Orbital period | 1.44 days |
| Earth Similarity Index | 0.23 |
| Distance from Earth | 1,868.9 light-years (573.0 parsecs) |
| Constellation | Cygnus |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2016 |
Data: NASA Exoplanet Archive, last updated 2016-05-06. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-1171 b
Is Kepler-1171 b habitable?
Kepler-1171 b is not known to orbit within the habitable zone of Kepler-1171, and as a mini-Neptune it is an unlikely candidate for life as we know it.
How far away is Kepler-1171 b?
Kepler-1171 b is about 1,869 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 32,892,640 years to get there.
How big is Kepler-1171 b compared to Earth?
Kepler-1171 b has 2.56 times the radius of Earth.
How long is a year on Kepler-1171 b?
One orbit around Kepler-1171 takes 1.4 Earth days — short enough that 253 of its years would fit into one Earth year.
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