WASP-105 b
WASP-105 b is a hot Jupiter orbiting the K2 star WASP-105 in the constellation Phoenix. It lies about 552 light-years from Earth and was discovered in 2017 using the transit method.
How Big Is WASP-105 b?
WASP-105 b has a radius of 10.76 times that of Earth, or 0.96 times the radius of Jupiter. Its mass is 572 times that of Earth, giving it a density of 2.65 g/cm³ — between that of rocky and gaseous planets.
Is WASP-105 b in the Habitable Zone?
WASP-105 b orbits inside the inner edge of the habitable zone of WASP-105. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of WASP-105: 0.541–1.304 AU (conservative: 0.685–1.237 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
See the full interactive habitable-zone view in the Exoplanet Explorer app ›
Temperature on WASP-105 b
The equilibrium temperature of WASP-105 b is about 900 K (627 °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.
Orbit and Year Length
A year on WASP-105 b — one full orbit around WASP-105 — lasts 7.87 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.075 AU — closer to its star than Mercury is to the Sun.
How Was WASP-105 b Discovered?
WASP-105 b was discovered in 2017 using the transit method, with observations from SuperWASP-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-105 b?
WASP-105 b is 552.1 light-years (169.3 parsecs) from Earth. Light arriving here tonight left the planet around the year 1474. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 9,716,960 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-105 b scores 0.09, ranking #4,544 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: WASP-105
WASP-105
- Spectral type
- K2
- Surface temperature
- 5,070 K (Sun: 5,772 K)
- Mass
- 0.89 M☉
- Radius
- 0.90 R☉
Planetary System
WASP-105 b is the only planet known to orbit WASP-105 so far.
WASP-105 b — Complete Data
| Radius | 10.761 Earth radii (0.960 Jupiter radii) |
|---|---|
| Mass | 572.09 Earth masses (1.800 Jupiter masses) |
| Density | 2.65 g/cm³ (Earth: 5.51) |
| Orbital period | 7.87 days |
| Orbital distance | 0.075 AU |
| Equilibrium temperature | 900 K (627 °C) |
| Earth Similarity Index | 0.09 |
| Distance from Earth | 552.1 light-years (169.3 parsecs) |
| Constellation | Phoenix |
| Discovery method | Transit |
| Discovery facility | SuperWASP-South |
| Discovery year | 2017 |
Data: NASA Exoplanet Archive, last updated 2017-08-14. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About WASP-105 b
Is WASP-105 b habitable?
No — WASP-105 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is WASP-105 b?
WASP-105 b is about 552 light-years from Earth in the constellation Phoenix. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 9,716,960 years to get there.
How big is WASP-105 b compared to Earth?
WASP-105 b has 10.76 times the radius of Earth and about 572 times its mass.
How long is a year on WASP-105 b?
One orbit around WASP-105 takes 7.9 Earth days — short enough that 46 of its years would fit into one Earth year.
Explore WASP-105 b in the app
Browse, filter and compare 6,000+ exoplanets on iPhone, iPad and Apple Watch — with habitable-zone views, widgets and offline data.
