KELT-10 b
KELT-10 b is a hot Jupiter orbiting the G0 V star KELT-10 in the constellation Telescopium. It lies about 615 light-years from Earth and was discovered in 2016 using the transit method.
How Big Is KELT-10 b?
KELT-10 b has a radius of 15.68 times that of Earth, or 1.40 times the radius of Jupiter. Its mass is 216 times that of Earth, giving it a density of 0.31 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is KELT-10 b in the Habitable Zone?
KELT-10 b orbits inside the inner edge of the habitable zone of KELT-10. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of KELT-10: 0.954–2.238 AU (conservative: 1.208–2.122 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on KELT-10 b
The equilibrium temperature of KELT-10 b is about 1,377 K (1,104 °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. It receives 600 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on KELT-10 b — one full orbit around KELT-10 — lasts 4.17 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.053 AU — closer to its star than Mercury is to the Sun.
How Was KELT-10 b Discovered?
KELT-10 b was discovered in 2016 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-10 b?
KELT-10 b is 614.5 light-years (188.4 parsecs) from Earth. Light arriving here tonight left the planet around the year 1412. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 10,815,200 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-10 b scores 0.06, ranking #5,147 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: KELT-10
KELT-10
- Spectral type
- G0 V
- Surface temperature
- 5,948 K (Sun: 5,772 K)
- Mass
- 1.11 M☉
- Radius
- 1.21 R☉
- Luminosity
- 1.6500 L☉
- Age
- 4.5 billion years (Sun: 4.6)
Planetary System
KELT-10 b is the only planet known to orbit KELT-10 so far.
KELT-10 b — Complete Data
| Radius | 15.681 Earth radii (1.399 Jupiter radii) |
|---|---|
| Mass | 215.81 Earth masses (0.679 Jupiter masses) |
| Density | 0.31 g/cm³ (Earth: 5.51) |
| Orbital period | 4.17 days |
| Orbital distance | 0.053 AU |
| Equilibrium temperature | 1,377 K (1,104 °C) |
| Stellar irradiation | 600.00× Earth |
| Earth Similarity Index | 0.06 |
| Distance from Earth | 614.5 light-years (188.4 parsecs) |
| Constellation | Telescopium |
| Discovery method | Transit |
| Discovery facility | KELT-South |
| Discovery year | 2016 |
Data: NASA Exoplanet Archive, last updated 2016-04-27. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About KELT-10 b
Is KELT-10 b habitable?
No — KELT-10 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is KELT-10 b?
KELT-10 b is about 615 light-years from Earth in the constellation Telescopium. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 10,815,200 years to get there.
How big is KELT-10 b compared to Earth?
KELT-10 b has 15.68 times the radius of Earth and about 216 times its mass.
How long is a year on KELT-10 b?
One orbit around KELT-10 takes 4.2 Earth days — short enough that 88 of its years would fit into one Earth year.
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