HATS-58 A b
HATS-58 A b is a hot Jupiter orbiting HATS-58 A in the constellation Centaurus. It lies about 1,316 light-years from Earth and was discovered in 2019 using the transit method.
How Big Is HATS-58 A b?
HATS-58 A b has a radius of 12.27 times that of Earth, or 1.10 times the radius of Jupiter. Its mass is 327 times that of Earth, giving it a density of 0.96 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is HATS-58 A b in the Habitable Zone?
HATS-58 A b orbits inside the inner edge of the habitable zone of HATS-58 A. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HATS-58 A: 1.535–3.538 AU (conservative: 1.944–3.354 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on HATS-58 A b
The equilibrium temperature of HATS-58 A b is about 1,721 K (1,448 °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-58 A b — one full orbit around HATS-58 A — lasts 4.22 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.058 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.17).
How Was HATS-58 A b Discovered?
HATS-58 A 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-58 A b?
HATS-58 A b is 1,316.3 light-years (403.6 parsecs) from Earth. Light arriving here tonight left the planet about 1,316 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 23,166,880 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-58 A b scores 0.07, ranking #4,857 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HATS-58 A
HATS-58 A b belongs to a system of 2 stars; it orbits HATS-58 A.
HATS-58 A
- Surface temperature
- 7,175 K (Sun: 5,772 K)
- Mass
- 1.46 M☉
- Radius
- 1.43 R☉
- Luminosity
- 4.8900 L☉
- Age
- 0.3 billion years (Sun: 4.6)
Planetary System
HATS-58 A b is the only planet known to orbit HATS-58 A so far.
HATS-58 A b — Complete Data
| Radius | 12.274 Earth radii (1.095 Jupiter radii) |
|---|---|
| Mass | 327.36 Earth masses (1.030 Jupiter masses) |
| Density | 0.96 g/cm³ (Earth: 5.51) |
| Orbital period | 4.22 days |
| Orbital distance | 0.058 AU |
| Eccentricity | 0.168 |
| Equilibrium temperature | 1,721 K (1,448 °C) |
| Earth Similarity Index | 0.07 |
| Distance from Earth | 1,316.3 light-years (403.6 parsecs) |
| Constellation | Centaurus |
| Discovery method | Transit |
| Discovery facility | HATSouth |
| Discovery year | 2019 |
Data: NASA Exoplanet Archive, last updated 2019-08-09. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HATS-58 A b
Is HATS-58 A b habitable?
No — HATS-58 A b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HATS-58 A b?
HATS-58 A b is about 1,316 light-years from Earth in the constellation Centaurus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 23,166,880 years to get there.
How big is HATS-58 A b compared to Earth?
HATS-58 A b has 12.27 times the radius of Earth and about 327 times its mass.
How long is a year on HATS-58 A b?
One orbit around HATS-58 A takes 4.2 Earth days — short enough that 87 of its years would fit into one Earth year.
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