Kepler-35 b
Kepler-35 b is a cold gas giant orbiting Kepler-35 in the constellation Cygnus. It lies about 5,933 light-years from Earth and was discovered in 2011 using the transit method.
How Big Is Kepler-35 b?
Kepler-35 b has a radius of 8.16 times that of Earth, or 0.73 times the radius of Jupiter. Its mass is 40.4 times that of Earth, giving it a density of 0.41 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is Kepler-35 b in the Habitable Zone?
Kepler-35 b orbits inside the inner edge of the habitable zone of Kepler-35. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Kepler-35: 0.735–1.740 AU (conservative: 0.931–1.650 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-35 b — one full orbit around Kepler-35 — lasts 131.5 Earth days, between the years of Mercury (88 days) and Earth (365 days). It orbits at an average distance of 0.603 AU — comparable to the inner Solar System. Its orbit is nearly circular (eccentricity 0.042).
How Was Kepler-35 b Discovered?
Kepler-35 b was discovered in 2011 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-35 b?
Kepler-35 b is 5,933.3 light-years (1,819.2 parsecs) from Earth. Light arriving here tonight left the planet about 5,933 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 104,426,080 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-35 b scores 0.37, ranking #662 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-35
Kepler-35 b is a circumbinary planet — it orbits around two stars at once, like Tatooine in Star Wars.
Kepler-35
- Surface temperature
- 5,606 K (Sun: 5,772 K)
- Mass
- 0.89 M☉
- Radius
- 1.03 R☉
- Luminosity
- 0.9397 L☉
Planetary System
Kepler-35 b is the only planet known to orbit Kepler-35 so far.
Kepler-35 b — Complete Data
| Radius | 8.160 Earth radii (0.728 Jupiter radii) |
|---|---|
| Mass | 40.36 Earth masses (0.127 Jupiter masses) |
| Density | 0.41 g/cm³ (Earth: 5.51) |
| Orbital period | 131.46 days |
| Orbital distance | 0.603 AU |
| Eccentricity | 0.042 |
| Earth Similarity Index | 0.37 |
| Distance from Earth | 5,933.3 light-years (1,819.2 parsecs) |
| Constellation | Cygnus |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2011 |
Data: NASA Exoplanet Archive, last updated 2014-05-14. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-35 b
Is Kepler-35 b habitable?
No — Kepler-35 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is Kepler-35 b?
Kepler-35 b is about 5,933 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 104,426,080 years to get there.
How big is Kepler-35 b compared to Earth?
Kepler-35 b has 8.16 times the radius of Earth and about 40.4 times its mass.
How long is a year on Kepler-35 b?
One orbit around Kepler-35 takes 131.5 Earth days.
Explore Kepler-35 b in the app
Browse, filter and compare 6,000+ exoplanets on iPhone, iPad and Apple Watch — with habitable-zone views, widgets and offline data.
