WASP-193 b
WASP-193 b is a hot Jupiter orbiting WASP-193 in the constellation Hydra. It lies about 1,181 light-years from Earth and was discovered in 2023 using the transit method.
How Big Is WASP-193 b?
WASP-193 b has a radius of 14.78 times that of Earth, or 1.32 times the radius of Jupiter. Its mass is 35.6 times that of Earth, giving it a density of 0.06 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is WASP-193 b in the Habitable Zone?
WASP-193 b orbits inside the inner edge of the habitable zone of WASP-193. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of WASP-193: 0.994–2.325 AU (conservative: 1.259–2.204 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on WASP-193 b
The equilibrium temperature of WASP-193 b is about 1,250 K (977 °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 402 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on WASP-193 b — one full orbit around WASP-193 — lasts 6.25 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.067 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.08).
How Was WASP-193 b Discovered?
WASP-193 b was discovered in 2023 using the transit method, with observations from WASP-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 WASP-193 b?
WASP-193 b is 1,181.0 light-years (362.1 parsecs) from Earth. Light arriving here tonight left the planet about 1,181 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 20,785,600 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. WASP-193 b scores 0.06, ranking #5,180 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: WASP-193
WASP-193 b belongs to a system of 2 stars; it orbits WASP-193.
WASP-193
- Surface temperature
- 6,080 K (Sun: 5,772 K)
- Mass
- 1.02 M☉
- Radius
- 1.21 R☉
- Luminosity
- 1.8200 L☉
- Age
- 6.8 billion years (Sun: 4.6)
Planetary System
WASP-193 b is the only planet known to orbit WASP-193 so far.
WASP-193 b — Complete Data
| Radius | 14.785 Earth radii (1.319 Jupiter radii) |
|---|---|
| Mass | 35.60 Earth masses (0.112 Jupiter masses) |
| Density | 0.06 g/cm³ (Earth: 5.51) |
| Orbital period | 6.25 days |
| Orbital distance | 0.067 AU |
| Eccentricity | 0.081 |
| Equilibrium temperature | 1,250 K (977 °C) |
| Stellar irradiation | 402.00× Earth |
| Earth Similarity Index | 0.06 |
| Distance from Earth | 1,181.0 light-years (362.1 parsecs) |
| Constellation | Hydra |
| Discovery method | Transit |
| Discovery facility | WASP-South |
| Discovery year | 2023 |
Data: NASA Exoplanet Archive, last updated 2025-11-20. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About WASP-193 b
Is WASP-193 b habitable?
No — WASP-193 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is WASP-193 b?
WASP-193 b is about 1,181 light-years from Earth in the constellation Hydra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 20,785,600 years to get there.
How big is WASP-193 b compared to Earth?
WASP-193 b has 14.78 times the radius of Earth and about 35.6 times its mass.
How long is a year on WASP-193 b?
One orbit around WASP-193 takes 6.2 Earth days — short enough that 58 of its years would fit into one Earth year.
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