Kepler-75 b
Kepler-75 b is a hot Jupiter orbiting the K0 V star Kepler-75 in the constellation Lyra. It lies about 2,725 light-years from Earth and was discovered in 2013 using the transit method.
How Big Is Kepler-75 b?
Kepler-75 b has a radius of 11.77 times that of Earth, or 1.05 times the radius of Jupiter. Its mass is 3,210 times that of Earth, giving it a density of 11.00 g/cm³ — comparable to rocky planets like Earth (5.51 g/cm³).
Is Kepler-75 b in the Habitable Zone?
Kepler-75 b orbits inside the inner edge of the habitable zone of Kepler-75. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Kepler-75: 0.559–1.341 AU (conservative: 0.708–1.272 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on Kepler-75 b
The equilibrium temperature of Kepler-75 b is about 767 K (494 °C) — hot enough to melt many metals. 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 Kepler-75 b — one full orbit around Kepler-75 — lasts 8.88 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.082 AU — closer to its star than Mercury is to the Sun. Its orbit is highly elliptical (eccentricity 0.57), swinging dramatically closer to and farther from its star.
How Was Kepler-75 b Discovered?
Kepler-75 b was discovered in 2013 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-75 b?
Kepler-75 b is 2,724.6 light-years (835.4 parsecs) from Earth. Light arriving here tonight left the planet about 2,725 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 47,952,960 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. Kepler-75 b scores 0.08, ranking #4,582 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-75
Kepler-75
- Spectral type
- K0 V
- Surface temperature
- 5,200 K (Sun: 5,772 K)
- Mass
- 0.91 M☉
- Radius
- 0.89 R☉
- Age
- 6.2 billion years (Sun: 4.6)
Planetary System
Kepler-75 b is the only planet known to orbit Kepler-75 so far.
Kepler-75 b — Complete Data
| Radius | 11.770 Earth radii (1.050 Jupiter radii) |
|---|---|
| Mass | 3,209.90 Earth masses (10.100 Jupiter masses) |
| Density | 11.00 g/cm³ (Earth: 5.51) |
| Orbital period | 8.88 days |
| Orbital distance | 0.082 AU |
| Eccentricity | 0.570 |
| Equilibrium temperature | 767 K (494 °C) |
| Earth Similarity Index | 0.08 |
| Distance from Earth | 2,724.6 light-years (835.4 parsecs) |
| Constellation | Lyra |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2013 |
Data: NASA Exoplanet Archive, last updated 2015-01-29. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-75 b
Is Kepler-75 b habitable?
No — Kepler-75 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is Kepler-75 b?
Kepler-75 b is about 2,725 light-years from Earth in the constellation Lyra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 47,952,960 years to get there.
How big is Kepler-75 b compared to Earth?
Kepler-75 b has 11.77 times the radius of Earth and about 3,210 times its mass.
How long is a year on Kepler-75 b?
One orbit around Kepler-75 takes 8.9 Earth days — short enough that 41 of its years would fit into one Earth year.
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