Kepler-891 b
Kepler-891 b is a cold gas giant orbiting Kepler-891 in the constellation Lyra. It lies about 7,634 light-years from Earth and was discovered in 2016 using the transit method.
How Big Is Kepler-891 b?
Kepler-891 b has a radius of 6.41 times that of Earth, or 0.57 times the radius of Jupiter.
Is Kepler-891 b in the Habitable Zone?
The position of Kepler-891 b relative to the habitable zone of Kepler-891 cannot be precisely determined from the available orbital data.
Habitable zone of Kepler-891: 0.828–1.946 AU (conservative: 1.049–1.845 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-891 b — one full orbit around Kepler-891 — lasts 53.4 Earth days, shorter than Mercury's 88-day year.
How Was Kepler-891 b Discovered?
Kepler-891 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-891 b?
Kepler-891 b is 7,633.9 light-years (2,340.6 parsecs) from Earth. Light arriving here tonight left the planet about 7,634 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 134,356,640 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-891 b scores 0.15, ranking #4,217 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-891
Kepler-891
- Surface temperature
- 5,887 K (Sun: 5,772 K)
- Mass
- 1.06 M☉
- Radius
- 1.07 R☉
- Age
- 3.6 billion years (Sun: 4.6)
Planetary System
Kepler-891 b is the only planet known to orbit Kepler-891 so far.
Kepler-891 b — Complete Data
| Radius | 6.410 Earth radii (0.572 Jupiter radii) |
|---|---|
| Orbital period | 53.45 days |
| Earth Similarity Index | 0.15 |
| Distance from Earth | 7,633.9 light-years (2,340.6 parsecs) |
| Constellation | Lyra |
| 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-891 b
Is Kepler-891 b habitable?
Kepler-891 b is not known to orbit within the habitable zone of Kepler-891, and as a cold gas giant it is an unlikely candidate for life as we know it.
How far away is Kepler-891 b?
Kepler-891 b is about 7,634 light-years from Earth in the constellation Lyra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 134,356,640 years to get there.
How big is Kepler-891 b compared to Earth?
Kepler-891 b has 6.41 times the radius of Earth.
How long is a year on Kepler-891 b?
One orbit around Kepler-891 takes 53.4 Earth days.
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