Qatar-5 b
Qatar-5 b is a hot Jupiter orbiting the G2 V star Qatar-5 in the constellation Andromeda. It lies about 1,199 light-years from Earth and was discovered in 2017 using the transit method.
How Big Is Qatar-5 b?
Qatar-5 b has a radius of 12.41 times that of Earth, or 1.11 times the radius of Jupiter. Its mass is 1,373 times that of Earth, giving it a density of 3.95 g/cm³ — between that of rocky and gaseous planets.
Is Qatar-5 b in the Habitable Zone?
Qatar-5 b orbits inside the inner edge of the habitable zone of Qatar-5. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Qatar-5: 0.802–1.891 AU (conservative: 1.016–1.793 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on Qatar-5 b
The equilibrium temperature of Qatar-5 b is about 1,415 K (1,142 °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 669 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on Qatar-5 b — one full orbit around Qatar-5 — lasts 2.88 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.041 AU — closer to its star than Mercury is to the Sun.
How Was Qatar-5 b Discovered?
Qatar-5 b was discovered in 2017 using the transit method, with observations from Qatar.
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 Qatar-5 b?
Qatar-5 b is 1,199.1 light-years (367.7 parsecs) from Earth. Light arriving here tonight left the planet about 1,199 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 21,104,160 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. Qatar-5 b scores 0.07, ranking #4,851 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Qatar-5
Qatar-5
- Spectral type
- G2 V
- Surface temperature
- 5,747 K (Sun: 5,772 K)
- Mass
- 1.13 M☉
- Radius
- 1.08 R☉
- Luminosity
- 1.1380 L☉
- Age
- 0.5 billion years (Sun: 4.6)
Planetary System
Qatar-5 b is the only planet known to orbit Qatar-5 so far.
Qatar-5 b — Complete Data
| Radius | 12.408 Earth radii (1.107 Jupiter radii) |
|---|---|
| Mass | 1,373.03 Earth masses (4.320 Jupiter masses) |
| Density | 3.95 g/cm³ (Earth: 5.51) |
| Orbital period | 2.88 days |
| Orbital distance | 0.041 AU |
| Equilibrium temperature | 1,415 K (1,142 °C) |
| Stellar irradiation | 669.00× Earth |
| Earth Similarity Index | 0.07 |
| Distance from Earth | 1,199.1 light-years (367.7 parsecs) |
| Constellation | Andromeda |
| Discovery method | Transit |
| Discovery facility | Qatar |
| Discovery year | 2017 |
Data: NASA Exoplanet Archive, last updated 2017-04-24. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Qatar-5 b
Is Qatar-5 b habitable?
No — Qatar-5 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is Qatar-5 b?
Qatar-5 b is about 1,199 light-years from Earth in the constellation Andromeda. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 21,104,160 years to get there.
How big is Qatar-5 b compared to Earth?
Qatar-5 b has 12.41 times the radius of Earth and about 1,373 times its mass.
How long is a year on Qatar-5 b?
One orbit around Qatar-5 takes 2.9 Earth days — short enough that 127 of its years would fit into one Earth year.
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