HATS-53 b
HATS-53 b is a hot Jupiter orbiting HATS-53 in the constellation Hydra. It lies about 1,911 light-years from Earth and was discovered in 2017 using the transit method.
How Big Is HATS-53 b?
HATS-53 b has a radius of 15.02 times that of Earth, or 1.34 times the radius of Jupiter. Its mass is 189 times that of Earth, giving it a density of 0.30 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is HATS-53 b in the Habitable Zone?
HATS-53 b orbits inside the inner edge of the habitable zone of HATS-53. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HATS-53: 0.797–1.885 AU (conservative: 1.010–1.787 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on HATS-53 b
The equilibrium temperature of HATS-53 b is about 1,312 K (1,039 °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-53 b — one full orbit around HATS-53 — lasts 3.85 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.048 AU — closer to its star than Mercury is to the Sun. Its orbit is highly elliptical (eccentricity 0.33), swinging dramatically closer to and farther from its star.
How Was HATS-53 b Discovered?
HATS-53 b was discovered in 2017 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-53 b?
HATS-53 b is 1,910.5 light-years (585.8 parsecs) from Earth. Light arriving here tonight left the planet about 1,911 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 33,624,800 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-53 b scores 0.06, ranking #5,113 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HATS-53
HATS-53
- Surface temperature
- 5,644 K (Sun: 5,772 K)
- Mass
- 0.96 M☉
- Radius
- 1.10 R☉
- Luminosity
- 1.1100 L☉
- Age
- 9.0 billion years (Sun: 4.6)
Planetary System
HATS-53 b is the only planet known to orbit HATS-53 so far.
HATS-53 b — Complete Data
| Radius | 15.020 Earth radii (1.340 Jupiter radii) |
|---|---|
| Mass | 189.11 Earth masses (0.595 Jupiter masses) |
| Density | 0.30 g/cm³ (Earth: 5.51) |
| Orbital period | 3.85 days |
| Orbital distance | 0.048 AU |
| Eccentricity | 0.330 |
| Equilibrium temperature | 1,312 K (1,039 °C) |
| Earth Similarity Index | 0.06 |
| Distance from Earth | 1,910.5 light-years (585.8 parsecs) |
| Constellation | Hydra |
| Discovery method | Transit |
| Discovery facility | HATSouth |
| Discovery year | 2017 |
Data: NASA Exoplanet Archive, last updated 2018-01-03. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HATS-53 b
Is HATS-53 b habitable?
No — HATS-53 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HATS-53 b?
HATS-53 b is about 1,911 light-years from Earth in the constellation Hydra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 33,624,800 years to get there.
How big is HATS-53 b compared to Earth?
HATS-53 b has 15.02 times the radius of Earth and about 189 times its mass.
How long is a year on HATS-53 b?
One orbit around HATS-53 takes 3.9 Earth days — short enough that 95 of its years would fit into one Earth year.
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