Kepler-1654 b
Kepler-1654 b is a cold gas giant orbiting the G5 V star Kepler-1654 in the constellation Lyra. It lies about 1,853 light-years from Earth and was discovered in 2018 using the transit method.
How Big Is Kepler-1654 b?
Kepler-1654 b has a radius of 9.18 times that of Earth, or 0.82 times the radius of Jupiter. Its mass is 159 times that of Earth, giving it a density of 1.20 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is Kepler-1654 b in the Habitable Zone?
Kepler-1654 b orbits beyond the outer edge of the habitable zone of Kepler-1654. At that distance, any surface water would almost certainly be frozen.
Habitable zone of Kepler-1654: 0.841–1.992 AU (conservative: 1.066–1.889 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on Kepler-1654 b
The equilibrium temperature of Kepler-1654 b is about 206 K (-67 °C) — well below freezing. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C. It receives 0.30 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on Kepler-1654 b — one full orbit around Kepler-1654 — lasts 1,047.8 Earth days, longer than an Earth year. It orbits at an average distance of 2.026 AU. Its orbit is mildly elliptical (eccentricity 0.26).
How Was Kepler-1654 b Discovered?
Kepler-1654 b was discovered in 2018 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-1654 b?
Kepler-1654 b is 1,852.9 light-years (568.1 parsecs) from Earth. Light arriving here tonight left the planet about 1,853 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 32,611,040 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-1654 b scores 0.32, ranking #1,008 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-1654
Kepler-1654
- Spectral type
- G5 V
- Surface temperature
- 5,597 K (Sun: 5,772 K)
- Mass
- 1.01 M☉
- Radius
- 1.18 R☉
- Luminosity
- 1.2300 L☉
- Age
- 5.0 billion years (Sun: 4.6)
Planetary System
Kepler-1654 b is the only planet known to orbit Kepler-1654 so far.
Kepler-1654 b — Complete Data
| Radius | 9.180 Earth radii (0.819 Jupiter radii) |
|---|---|
| Mass | 158.92 Earth masses (0.500 Jupiter masses) |
| Density | 1.20 g/cm³ (Earth: 5.51) |
| Orbital period | 1,047.84 days |
| Orbital distance | 2.026 AU |
| Eccentricity | 0.260 |
| Equilibrium temperature | 206 K (-67 °C) |
| Stellar irradiation | 0.30× Earth |
| Earth Similarity Index | 0.32 |
| Distance from Earth | 1,852.9 light-years (568.1 parsecs) |
| Constellation | Lyra |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2018 |
Data: NASA Exoplanet Archive, last updated 2018-03-05. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-1654 b
Is Kepler-1654 b habitable?
No — Kepler-1654 b orbits outside the habitable zone of Kepler-1654 and is likely too cold for liquid water on its surface.
How far away is Kepler-1654 b?
Kepler-1654 b is about 1,853 light-years from Earth in the constellation Lyra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 32,611,040 years to get there.
How big is Kepler-1654 b compared to Earth?
Kepler-1654 b has 9.18 times the radius of Earth and about 159 times its mass.
How long is a year on Kepler-1654 b?
One orbit around Kepler-1654 takes 1,047.8 Earth days.
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