HATS-69 b
HATS-69 b is a hot Jupiter orbiting HATS-69 in the constellation Pavo. It lies about 1,352 light-years from Earth and was discovered in 2018 using the transit method.
How Big Is HATS-69 b?
HATS-69 b has a radius of 10.59 times that of Earth, or 0.95 times the radius of Jupiter. Its mass is 183 times that of Earth, giving it a density of 0.46 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is HATS-69 b in the Habitable Zone?
HATS-69 b orbits inside the inner edge of the habitable zone of HATS-69. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HATS-69: 0.540–1.298 AU (conservative: 0.684–1.231 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on HATS-69 b
The equilibrium temperature of HATS-69 b is about 1,296 K (1,023 °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 467 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on HATS-69 b — one full orbit around HATS-69 — lasts 2.23 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.032 AU — closer to its star than Mercury is to the Sun. Its orbit is highly elliptical (eccentricity 0.52), swinging dramatically closer to and farther from its star.
How Was HATS-69 b Discovered?
HATS-69 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-69 b?
HATS-69 b is 1,352.0 light-years (414.5 parsecs) from Earth. Light arriving here tonight left the planet about 1,352 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 23,795,200 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-69 b scores 0.08, ranking #4,589 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HATS-69
HATS-69
- Surface temperature
- 5,137 K (Sun: 5,772 K)
- Mass
- 0.89 M☉
- Radius
- 0.88 R☉
- Luminosity
- 0.4813 L☉
- Age
- 8.0 billion years (Sun: 4.6)
Planetary System
HATS-69 b is the only planet known to orbit HATS-69 so far.
HATS-69 b — Complete Data
| Radius | 10.593 Earth radii (0.945 Jupiter radii) |
|---|---|
| Mass | 183.39 Earth masses (0.577 Jupiter masses) |
| Density | 0.46 g/cm³ (Earth: 5.51) |
| Orbital period | 2.23 days |
| Orbital distance | 0.032 AU |
| Eccentricity | 0.519 |
| Equilibrium temperature | 1,296 K (1,023 °C) |
| Stellar irradiation | 466.60× Earth |
| Earth Similarity Index | 0.08 |
| Distance from Earth | 1,352.0 light-years (414.5 parsecs) |
| Constellation | Pavo |
| 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-69 b
Is HATS-69 b habitable?
No — HATS-69 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HATS-69 b?
HATS-69 b is about 1,352 light-years from Earth in the constellation Pavo. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 23,795,200 years to get there.
How big is HATS-69 b compared to Earth?
HATS-69 b has 10.59 times the radius of Earth and about 183 times its mass.
How long is a year on HATS-69 b?
One orbit around HATS-69 takes 2.2 Earth days — short enough that 164 of its years would fit into one Earth year.
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