Kepler-1653 b
Kepler-1653 b is a mini-Neptune orbiting Kepler-1653 in the constellation Cygnus. It 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.
See the full interactive habitable-zone view in the Exoplanet Explorer app ›
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.
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 5,568 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 |
| 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 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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