Kepler-1653 b
Kepler-1653 b is a mini-Neptune orbiting Kepler-1653 in the constellation Cygnus. It lies about 2,463 light-years from Earth and was discovered in 2017 using the transit method. It orbits within the habitable zone of its star — the region where liquid water could exist on a planet's surface.
How Big Is Kepler-1653 b?
Kepler-1653 b has a radius of 2.17 times that of Earth.
Is Kepler-1653 b in the Habitable Zone?
Kepler-1653 b orbits within the optimistic habitable zone of Kepler-1653 — the broader region where liquid water might be possible under favorable atmospheric conditions.
Habitable zone of Kepler-1653: 0.380–0.926 AU (conservative: 0.481–0.878 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on Kepler-1653 b
The equilibrium temperature of Kepler-1653 b is about 284 K (11 °C) — in a range broadly comparable to Earth, whose equilibrium temperature is 255 K. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C. It receives 0.98 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on Kepler-1653 b — one full orbit around Kepler-1653 — lasts 140.3 Earth days, between the years of Mercury (88 days) and Earth (365 days). It orbits at an average distance of 0.471 AU — comparable to the inner Solar System.
How Was Kepler-1653 b Discovered?
Kepler-1653 b was discovered in 2017 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-1653 b?
Kepler-1653 b is 2,462.5 light-years (755.0 parsecs) from Earth. Light arriving here tonight left the planet about 2,463 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 43,340,000 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-1653 b scores 0.74, ranking #40 of 5,565 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-1653
Kepler-1653
- Surface temperature
- 4,807 K (Sun: 5,772 K)
- Mass
- 0.72 M☉
- Radius
- 0.69 R☉
- Luminosity
- 0.2312 L☉
- Age
- 7.7 billion years (Sun: 4.6)
Planetary System
Kepler-1653 b is the only planet known to orbit Kepler-1653 so far.
Kepler-1653 b — Complete Data
| Radius | 2.170 Earth radii (0.194 Jupiter radii) |
|---|---|
| Orbital period | 140.25 days |
| Orbital distance | 0.471 AU |
| Equilibrium temperature | 284 K (11 °C) |
| Stellar irradiation | 0.98× Earth |
| Earth Similarity Index | 0.74 |
| Distance from Earth | 2,462.5 light-years (755.0 parsecs) |
| Constellation | Cygnus |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2017 |
Data: NASA Exoplanet Archive, last updated 2017-11-14. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-1653 b
Is Kepler-1653 b habitable?
Kepler-1653 b orbits within the habitable zone of Kepler-1653, the region where liquid water could exist on a planet's surface. Whether it is actually habitable depends on its atmosphere and composition, which remain unknown.
How far away is Kepler-1653 b?
Kepler-1653 b is about 2,463 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 43,340,000 years to get there.
How big is Kepler-1653 b compared to Earth?
Kepler-1653 b has 2.17 times the radius of Earth.
How long is a year on Kepler-1653 b?
One orbit around Kepler-1653 takes 140.3 Earth days.
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