HAT-P-69 b
HAT-P-69 b is a hot Jupiter orbiting HAT-P-69 in the constellation Hydra. It lies about 1,113 light-years from Earth and was discovered in 2019 using the transit method.
How Big Is HAT-P-69 b?
HAT-P-69 b has a radius of 18.79 times that of Earth, or 1.68 times the radius of Jupiter. Its mass is 1,138 times that of Earth, giving it a density of 1.02 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is HAT-P-69 b in the Habitable Zone?
The position of HAT-P-69 b relative to the habitable zone of HAT-P-69 cannot be precisely determined from the available orbital data.
Temperature on HAT-P-69 b
The equilibrium temperature of HAT-P-69 b is about 1,930 K (1,657 °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 HAT-P-69 b — one full orbit around HAT-P-69 — lasts 4.79 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.066 AU — closer to its star than Mercury is to the Sun.
How Was HAT-P-69 b Discovered?
HAT-P-69 b was discovered in 2019 using the transit method, with observations from HATNet.
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 HAT-P-69 b?
HAT-P-69 b is 1,113.0 light-years (341.3 parsecs) from Earth. Light arriving here tonight left the planet about 1,113 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 19,588,800 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. HAT-P-69 b scores 0.05, ranking #5,284 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HAT-P-69
HAT-P-69
- Surface temperature
- 7,394 K (Sun: 5,772 K)
- Mass
- 1.65 M☉
- Radius
- 1.93 R☉
- Luminosity
- 10.0000 L☉
- Age
- 1.3 billion years (Sun: 4.6)
Planetary System
HAT-P-69 b is the only planet known to orbit HAT-P-69 so far.
HAT-P-69 b — Complete Data
| Radius | 18.786 Earth radii (1.676 Jupiter radii) |
|---|---|
| Mass | 1,137.83 Earth masses (3.580 Jupiter masses) |
| Density | 1.02 g/cm³ (Earth: 5.51) |
| Orbital period | 4.79 days |
| Orbital distance | 0.066 AU |
| Equilibrium temperature | 1,930 K (1,657 °C) |
| Earth Similarity Index | 0.05 |
| Distance from Earth | 1,113.0 light-years (341.3 parsecs) |
| Constellation | Hydra |
| Discovery method | Transit |
| Discovery facility | HATNet |
| Discovery year | 2019 |
Data: NASA Exoplanet Archive, last updated 2019-08-12. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HAT-P-69 b
Is HAT-P-69 b habitable?
HAT-P-69 b is not known to orbit within the habitable zone of HAT-P-69, and as a hot Jupiter it is an unlikely candidate for life as we know it.
How far away is HAT-P-69 b?
HAT-P-69 b is about 1,113 light-years from Earth in the constellation Hydra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 19,588,800 years to get there.
How big is HAT-P-69 b compared to Earth?
HAT-P-69 b has 18.79 times the radius of Earth and about 1,138 times its mass.
How long is a year on HAT-P-69 b?
One orbit around HAT-P-69 takes 4.8 Earth days — short enough that 76 of its years would fit into one Earth year.
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