KOI-3680 b
KOI-3680 b is a cold gas giant orbiting KOI-3680 in the constellation Cygnus. It lies about 3,007 light-years from Earth and was discovered in 2018 using the transit method.
How Big Is KOI-3680 b?
KOI-3680 b has a radius of 11.10 times that of Earth, or 0.99 times the radius of Jupiter. Its mass is 613 times that of Earth, giving it a density of 2.46 g/cm³ — between that of rocky and gaseous planets.
Is KOI-3680 b in the Habitable Zone?
KOI-3680 b orbits inside the inner edge of the habitable zone of KOI-3680. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of KOI-3680: 0.731–1.720 AU (conservative: 0.926–1.631 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on KOI-3680 b
The equilibrium temperature of KOI-3680 b is about 347 K (74 °C) — hotter than anywhere on Earth. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C.
Orbit and Year Length
A year on KOI-3680 b — one full orbit around KOI-3680 — lasts 141.2 Earth days, between the years of Mercury (88 days) and Earth (365 days). It orbits at an average distance of 0.534 AU — comparable to the inner Solar System. Its orbit is highly elliptical (eccentricity 0.50), swinging dramatically closer to and farther from its star.
How Was KOI-3680 b Discovered?
KOI-3680 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 KOI-3680 b?
KOI-3680 b is 3,007.1 light-years (922.0 parsecs) from Earth. Light arriving here tonight left the planet about 3,007 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 52,924,960 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. KOI-3680 b scores 0.25, ranking #3,059 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: KOI-3680
KOI-3680
- Surface temperature
- 5,830 K (Sun: 5,772 K)
- Mass
- 1.01 M☉
- Radius
- 0.96 R☉
- Age
- 3.2 billion years (Sun: 4.6)
Planetary System
KOI-3680 b is the only planet known to orbit KOI-3680 so far.
KOI-3680 b — Complete Data
| Radius | 11.097 Earth radii (0.990 Jupiter radii) |
|---|---|
| Mass | 613.41 Earth masses (1.930 Jupiter masses) |
| Density | 2.46 g/cm³ (Earth: 5.51) |
| Orbital period | 141.24 days |
| Orbital distance | 0.534 AU |
| Eccentricity | 0.496 |
| Equilibrium temperature | 347 K (74 °C) |
| Earth Similarity Index | 0.25 |
| Distance from Earth | 3,007.1 light-years (922.0 parsecs) |
| Constellation | Cygnus |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2018 |
Data: NASA Exoplanet Archive, last updated 2018-12-03. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About KOI-3680 b
Is KOI-3680 b habitable?
No — KOI-3680 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is KOI-3680 b?
KOI-3680 b is about 3,007 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 52,924,960 years to get there.
How big is KOI-3680 b compared to Earth?
KOI-3680 b has 11.10 times the radius of Earth and about 613 times its mass.
How long is a year on KOI-3680 b?
One orbit around KOI-3680 takes 141.2 Earth days.
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