HATS-54 b
HATS-54 b is a hot Jupiter orbiting the G6 V star HATS-54 in the constellation Centaurus. It lies about 2,442 light-years from Earth and was discovered in 2019 using the transit method.
How Big Is HATS-54 b?
HATS-54 b has a radius of 11.38 times that of Earth, or 1.01 times the radius of Jupiter. Its mass is 239 times that of Earth.
Is HATS-54 b in the Habitable Zone?
HATS-54 b orbits inside the inner edge of the habitable zone of HATS-54. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HATS-54: 0.864–2.045 AU (conservative: 1.095–1.939 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on HATS-54 b
The equilibrium temperature of HATS-54 b is about 1,429 K (1,156 °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 HATS-54 b — one full orbit around HATS-54 — lasts 2.54 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.037 AU — closer to its star than Mercury is to the Sun.
How Was HATS-54 b Discovered?
HATS-54 b was discovered in 2019 using the transit method, with observations from HATSouth.
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 HATS-54 b?
HATS-54 b is 2,441.6 light-years (748.6 parsecs) from Earth. Light arriving here tonight left the planet about 2,442 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 42,972,160 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. HATS-54 b scores 0.08, ranking #4,702 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HATS-54
HATS-54
- Spectral type
- G6 V
- Surface temperature
- 5,621 K (Sun: 5,772 K)
- Mass
- 1.05 M☉
- Radius
- 1.23 R☉
- Luminosity
- 1.3020 L☉
- Age
- 8.0 billion years (Sun: 4.6)
Planetary System
HATS-54 b is the only planet known to orbit HATS-54 so far.
HATS-54 b — Complete Data
| Radius | 11.377 Earth radii (1.015 Jupiter radii) |
|---|---|
| Mass | 239.32 Earth masses (0.753 Jupiter masses) |
| Orbital period | 2.54 days |
| Orbital distance | 0.037 AU |
| Equilibrium temperature | 1,429 K (1,156 °C) |
| Earth Similarity Index | 0.08 |
| Distance from Earth | 2,441.6 light-years (748.6 parsecs) |
| Constellation | Centaurus |
| Discovery method | Transit |
| Discovery facility | HATSouth |
| Discovery year | 2019 |
Data: NASA Exoplanet Archive, last updated 2023-01-04. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HATS-54 b
Is HATS-54 b habitable?
No — HATS-54 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HATS-54 b?
HATS-54 b is about 2,442 light-years from Earth in the constellation Centaurus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 42,972,160 years to get there.
How big is HATS-54 b compared to Earth?
HATS-54 b has 11.38 times the radius of Earth and about 239 times its mass.
How long is a year on HATS-54 b?
One orbit around HATS-54 takes 2.5 Earth days — short enough that 144 of its years would fit into one Earth year.
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