HATS-59 b
HATS-59 b is a hot Jupiter orbiting HATS-59 in the constellation Crater. It lies about 2,097 light-years from Earth and was discovered in 2018 using the transit method.
How Big Is HATS-59 b?
HATS-59 b has a radius of 12.62 times that of Earth, or 1.13 times the radius of Jupiter. Its mass is 256 times that of Earth, giving it a density of 0.70 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is HATS-59 b in the Habitable Zone?
HATS-59 b orbits inside the inner edge of the habitable zone of HATS-59. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HATS-59: 0.752–1.776 AU (conservative: 0.952–1.684 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on HATS-59 b
The equilibrium temperature of HATS-59 b is about 1,128 K (855 °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 269 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on HATS-59 b — one full orbit around HATS-59 — lasts 5.42 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.061 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.13).
How Was HATS-59 b Discovered?
HATS-59 b was discovered in 2018 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-59 b?
HATS-59 b is 2,096.8 light-years (642.9 parsecs) from Earth. Light arriving here tonight left the planet about 2,097 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 36,903,680 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. HATS-59 b scores 0.07, ranking #4,806 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HATS-59
HATS-59
- Surface temperature
- 5,670 K (Sun: 5,772 K)
- Mass
- 1.04 M☉
- Radius
- 1.04 R☉
- Luminosity
- 0.9900 L☉
- Age
- 4.3 billion years (Sun: 4.6)
The HATS-59 Planetary System
HATS-59 b is one of 2 known planets in the HATS-59 system. Its siblings:
HATS-59 b — Complete Data
| Radius | 12.621 Earth radii (1.126 Jupiter radii) |
|---|---|
| Mass | 256.17 Earth masses (0.806 Jupiter masses) |
| Density | 0.70 g/cm³ (Earth: 5.51) |
| Orbital period | 5.42 days |
| Orbital distance | 0.061 AU |
| Eccentricity | 0.129 |
| Equilibrium temperature | 1,128 K (855 °C) |
| Stellar irradiation | 269.00× Earth |
| Earth Similarity Index | 0.07 |
| Distance from Earth | 2,096.8 light-years (642.9 parsecs) |
| Constellation | Crater |
| Discovery method | Transit |
| Discovery facility | HATSouth |
| Discovery year | 2018 |
Data: NASA Exoplanet Archive, last updated 2018-12-03. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HATS-59 b
Is HATS-59 b habitable?
No — HATS-59 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HATS-59 b?
HATS-59 b is about 2,097 light-years from Earth in the constellation Crater. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 36,903,680 years to get there.
How big is HATS-59 b compared to Earth?
HATS-59 b has 12.62 times the radius of Earth and about 256 times its mass.
How long is a year on HATS-59 b?
One orbit around HATS-59 takes 5.4 Earth days — short enough that 67 of its years would fit into one Earth year.
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