KELT-11 b
KELT-11 b is a hot Jupiter orbiting KELT-11 in the constellation Sextans. It lies about 323 light-years from Earth and was discovered in 2017 using the transit method.
How Big Is KELT-11 b?
KELT-11 b has a radius of 15.13 times that of Earth, or 1.35 times the radius of Jupiter. Its mass is 65.2 times that of Earth.
Is KELT-11 b in the Habitable Zone?
KELT-11 b orbits inside the inner edge of the habitable zone of KELT-11. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of KELT-11: 1.788–4.265 AU (conservative: 2.265–4.043 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on KELT-11 b
The equilibrium temperature of KELT-11 b is about 1,712 K (1,439 °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 KELT-11 b — one full orbit around KELT-11 — lasts 4.74 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.062 AU — closer to its star than Mercury is to the Sun.
How Was KELT-11 b Discovered?
KELT-11 b was discovered in 2017 using the transit method, with observations from KELT-South.
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 KELT-11 b?
KELT-11 b is 323.4 light-years (99.2 parsecs) from Earth. Light arriving here tonight left the planet around the year 1703. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 5,691,840 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. KELT-11 b scores 0.06, ranking #5,138 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: KELT-11
KELT-11
- Surface temperature
- 5,375 K (Sun: 5,772 K)
- Mass
- 1.44 M☉
- Radius
- 2.69 R☉
Planetary System
KELT-11 b is the only planet known to orbit KELT-11 so far.
KELT-11 b — Complete Data
| Radius | 15.132 Earth radii (1.350 Jupiter radii) |
|---|---|
| Mass | 65.15 Earth masses (0.205 Jupiter masses) |
| Orbital period | 4.74 days |
| Orbital distance | 0.062 AU |
| Equilibrium temperature | 1,712 K (1,439 °C) |
| Earth Similarity Index | 0.06 |
| Distance from Earth | 323.4 light-years (99.2 parsecs) |
| Constellation | Sextans |
| Discovery method | Transit |
| Discovery facility | KELT-South |
| Discovery year | 2017 |
Data: NASA Exoplanet Archive, last updated 2025-06-11. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About KELT-11 b
Is KELT-11 b habitable?
No — KELT-11 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is KELT-11 b?
KELT-11 b is about 323 light-years from Earth in the constellation Sextans. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 5,691,840 years to get there.
How big is KELT-11 b compared to Earth?
KELT-11 b has 15.13 times the radius of Earth and about 65.2 times its mass.
How long is a year on KELT-11 b?
One orbit around KELT-11 takes 4.7 Earth days — short enough that 77 of its years would fit into one Earth year.
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