WASP-110 b
WASP-110 b is a hot Jupiter orbiting WASP-110 in the constellation Sagittarius. It lies about 897 light-years from Earth and was discovered in 2021 using the transit method.
How Big Is WASP-110 b?
WASP-110 b has a radius of 13.19 times that of Earth, or 1.18 times the radius of Jupiter. Its mass is 155 times that of Earth, giving it a density of 0.40 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is WASP-110 b in the Habitable Zone?
The position of WASP-110 b relative to the habitable zone of WASP-110 cannot be precisely determined from the available orbital data.
Habitable zone of WASP-110: 0.570–1.359 AU (conservative: 0.722–1.288 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on WASP-110 b
The equilibrium temperature of WASP-110 b is about 1,158 K (885 °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 279 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on WASP-110 b — one full orbit around WASP-110 — lasts 3.78 Earth days, shorter than Mercury's 88-day year.
How Was WASP-110 b Discovered?
WASP-110 b was discovered in 2021 using the transit method, with observations from Paranal Observatory.
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-110 b?
WASP-110 b is 896.8 light-years (275.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 1130. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 15,783,680 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-110 b scores 0.07, ranking #4,968 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: WASP-110
WASP-110
- Surface temperature
- 5,392 K (Sun: 5,772 K)
- Mass
- 0.81 M☉
- Radius
- 0.85 R☉
- Age
- 11.0 billion years (Sun: 4.6)
Planetary System
WASP-110 b is the only planet known to orbit WASP-110 so far.
WASP-110 b — Complete Data
| Radius | 13.193 Earth radii (1.177 Jupiter radii) |
|---|---|
| Mass | 154.78 Earth masses (0.487 Jupiter masses) |
| Density | 0.40 g/cm³ (Earth: 5.51) |
| Orbital period | 3.78 days |
| Equilibrium temperature | 1,158 K (885 °C) |
| Stellar irradiation | 279.00× Earth |
| Earth Similarity Index | 0.07 |
| Distance from Earth | 896.8 light-years (275.0 parsecs) |
| Constellation | Sagittarius |
| Discovery method | Transit |
| Discovery facility | Paranal Observatory |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2025-10-09. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About WASP-110 b
Is WASP-110 b habitable?
WASP-110 b is not known to orbit within the habitable zone of WASP-110, and as a hot Jupiter it is an unlikely candidate for life as we know it.
How far away is WASP-110 b?
WASP-110 b is about 897 light-years from Earth in the constellation Sagittarius. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 15,783,680 years to get there.
How big is WASP-110 b compared to Earth?
WASP-110 b has 13.19 times the radius of Earth and about 155 times its mass.
How long is a year on WASP-110 b?
One orbit around WASP-110 takes 3.8 Earth days — short enough that 97 of its years would fit into one Earth year.
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