WASP-153 b
WASP-153 b is a hot Jupiter orbiting the G0 star WASP-153 in the constellation Lyra. It lies about 1,990 light-years from Earth and was discovered in 2017 using the transit method.
How Big Is WASP-153 b?
WASP-153 b has a radius of 17.37 times that of Earth, or 1.55 times the radius of Jupiter. Its mass is 124 times that of Earth, giving it a density of 0.15 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is WASP-153 b in the Habitable Zone?
WASP-153 b orbits inside the inner edge of the habitable zone of WASP-153. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of WASP-153: 1.349–3.167 AU (conservative: 1.709–3.003 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on WASP-153 b
The equilibrium temperature of WASP-153 b is about 1,700 K (1,427 °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 1,400 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on WASP-153 b — one full orbit around WASP-153 — lasts 3.33 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.048 AU — closer to its star than Mercury is to the Sun. Its orbit is nearly circular (eccentricity 0.009).
How Was WASP-153 b Discovered?
WASP-153 b was discovered in 2017 using the transit method, with observations from SuperWASP.
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-153 b?
WASP-153 b is 1,990.1 light-years (610.2 parsecs) from Earth. Light arriving here tonight left the planet about 1,990 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 35,025,760 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-153 b scores 0.05, ranking #5,245 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: WASP-153
WASP-153
- Spectral type
- G0
- Surface temperature
- 5,914 K (Sun: 5,772 K)
- Mass
- 1.34 M☉
- Radius
- 1.73 R☉
- Age
- 4.0 billion years (Sun: 4.6)
Planetary System
WASP-153 b is the only planet known to orbit WASP-153 so far.
WASP-153 b — Complete Data
| Radius | 17.374 Earth radii (1.550 Jupiter radii) |
|---|---|
| Mass | 123.95 Earth masses (0.390 Jupiter masses) |
| Density | 0.15 g/cm³ (Earth: 5.51) |
| Orbital period | 3.33 days |
| Orbital distance | 0.048 AU |
| Eccentricity | 0.009 |
| Equilibrium temperature | 1,700 K (1,427 °C) |
| Stellar irradiation | 1,400.00× Earth |
| Earth Similarity Index | 0.05 |
| Distance from Earth | 1,990.1 light-years (610.2 parsecs) |
| Constellation | Lyra |
| Discovery method | Transit |
| Discovery facility | SuperWASP |
| Discovery year | 2017 |
Data: NASA Exoplanet Archive, last updated 2017-10-23. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About WASP-153 b
Is WASP-153 b habitable?
No — WASP-153 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is WASP-153 b?
WASP-153 b is about 1,990 light-years from Earth in the constellation Lyra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 35,025,760 years to get there.
How big is WASP-153 b compared to Earth?
WASP-153 b has 17.37 times the radius of Earth and about 124 times its mass.
How long is a year on WASP-153 b?
One orbit around WASP-153 takes 3.3 Earth days — short enough that 110 of its years would fit into one Earth year.
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