HAT-P-43 b
HAT-P-43 b is a hot Jupiter orbiting HAT-P-43 in the constellation Cancer. It lies about 1,725 light-years from Earth and was discovered in 2012 using the transit method.
How Big Is HAT-P-43 b?
HAT-P-43 b has a radius of 13.63 times that of Earth, or 1.22 times the radius of Jupiter.
Is HAT-P-43 b in the Habitable Zone?
HAT-P-43 b orbits inside the inner edge of the habitable zone of HAT-P-43. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HAT-P-43: 0.791–1.868 AU (conservative: 1.002–1.771 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on HAT-P-43 b
The equilibrium temperature of HAT-P-43 b is about 1,353 K (1,080 °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-43 b — one full orbit around HAT-P-43 — lasts 3.33 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.044 AU — closer to its star than Mercury is to the Sun.
How Was HAT-P-43 b Discovered?
HAT-P-43 b was discovered in 2012 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-43 b?
HAT-P-43 b is 1,724.8 light-years (528.8 parsecs) from Earth. Light arriving here tonight left the planet about 1,725 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 30,356,480 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-43 b scores 0.07, ranking #4,983 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HAT-P-43
HAT-P-43
- Surface temperature
- 5,693 K (Sun: 5,772 K)
- Mass
- 1.03 M☉
- Radius
- 1.08 R☉
Planetary System
HAT-P-43 b is the only planet known to orbit HAT-P-43 so far.
HAT-P-43 b — Complete Data
| Radius | 13.630 Earth radii (1.216 Jupiter radii) |
|---|---|
| Orbital period | 3.33 days |
| Orbital distance | 0.044 AU |
| Equilibrium temperature | 1,353 K (1,080 °C) |
| Earth Similarity Index | 0.07 |
| Distance from Earth | 1,724.8 light-years (528.8 parsecs) |
| Constellation | Cancer |
| Discovery method | Transit |
| Discovery facility | HATNet |
| Discovery year | 2012 |
Data: NASA Exoplanet Archive, last updated 2021-09-20. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HAT-P-43 b
Is HAT-P-43 b habitable?
No — HAT-P-43 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HAT-P-43 b?
HAT-P-43 b is about 1,725 light-years from Earth in the constellation Cancer. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 30,356,480 years to get there.
How big is HAT-P-43 b compared to Earth?
HAT-P-43 b has 13.63 times the radius of Earth.
How long is a year on HAT-P-43 b?
One orbit around HAT-P-43 takes 3.3 Earth days — short enough that 110 of its years would fit into one Earth year.
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