HATS-63 b
HATS-63 b is a hot Jupiter orbiting HATS-63 in the constellation Eridanus. It lies about 2,033 light-years from Earth and was discovered in 2018 using the transit method.
How Big Is HATS-63 b?
HATS-63 b has a radius of 13.53 times that of Earth, or 1.21 times the radius of Jupiter. Its mass is 305 times that of Earth, giving it a density of 0.67 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is HATS-63 b in the Habitable Zone?
HATS-63 b orbits inside the inner edge of the habitable zone of HATS-63. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HATS-63: 0.768–1.816 AU (conservative: 0.972–1.722 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on HATS-63 b
The equilibrium temperature of HATS-63 b is about 1,398 K (1,125 °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 634 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on HATS-63 b — one full orbit around HATS-63 — lasts 3.06 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.040 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.14).
How Was HATS-63 b Discovered?
HATS-63 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-63 b?
HATS-63 b is 2,032.7 light-years (623.2 parsecs) from Earth. Light arriving here tonight left the planet about 2,033 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 35,775,520 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-63 b scores 0.07, ranking #4,977 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HATS-63
HATS-63
- Surface temperature
- 5,627 K (Sun: 5,772 K)
- Mass
- 0.93 M☉
- Radius
- 1.07 R☉
- Luminosity
- 1.0280 L☉
- Age
- 10.3 billion years (Sun: 4.6)
Planetary System
HATS-63 b is the only planet known to orbit HATS-63 so far.
HATS-63 b — Complete Data
| Radius | 13.529 Earth radii (1.207 Jupiter radii) |
|---|---|
| Mass | 305.12 Earth masses (0.960 Jupiter masses) |
| Density | 0.67 g/cm³ (Earth: 5.51) |
| Orbital period | 3.06 days |
| Orbital distance | 0.040 AU |
| Eccentricity | 0.136 |
| Equilibrium temperature | 1,398 K (1,125 °C) |
| Stellar irradiation | 634.10× Earth |
| Earth Similarity Index | 0.07 |
| Distance from Earth | 2,032.7 light-years (623.2 parsecs) |
| Constellation | Eridanus |
| Discovery method | Transit |
| Discovery facility | HATSouth |
| Discovery year | 2018 |
Data: NASA Exoplanet Archive, last updated 2024-07-12. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HATS-63 b
Is HATS-63 b habitable?
No — HATS-63 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HATS-63 b?
HATS-63 b is about 2,033 light-years from Earth in the constellation Eridanus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 35,775,520 years to get there.
How big is HATS-63 b compared to Earth?
HATS-63 b has 13.53 times the radius of Earth and about 305 times its mass.
How long is a year on HATS-63 b?
One orbit around HATS-63 takes 3.1 Earth days — short enough that 119 of its years would fit into one Earth year.
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