HAT-P-34 b
HAT-P-34 b is a hot Jupiter orbiting HAT-P-34 in the constellation Sagitta. It lies about 813 light-years from Earth and was discovered in 2011 using the transit method.
How Big Is HAT-P-34 b?
HAT-P-34 b has a radius of 13.42 times that of Earth, or 1.20 times the radius of Jupiter. Its mass is 1,058 times that of Earth, giving it a density of 2.50 g/cm³ — between that of rocky and gaseous planets.
Is HAT-P-34 b in the Habitable Zone?
HAT-P-34 b orbits inside the inner edge of the habitable zone of HAT-P-34. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HAT-P-34: 1.371–3.185 AU (conservative: 1.737–3.020 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Orbit and Year Length
A year on HAT-P-34 b — one full orbit around HAT-P-34 — lasts 5.45 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.068 AU — closer to its star than Mercury is to the Sun. Its orbit is highly elliptical (eccentricity 0.43), swinging dramatically closer to and farther from its star.
How Was HAT-P-34 b Discovered?
HAT-P-34 b was discovered in 2011 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-34 b?
HAT-P-34 b is 813.2 light-years (249.3 parsecs) from Earth. Light arriving here tonight left the planet around the year 1213. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 14,312,320 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-34 b scores 0.07, ranking #4,978 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HAT-P-34
HAT-P-34
- Surface temperature
- 6,442 K (Sun: 5,772 K)
- Mass
- 1.39 M☉
- Radius
- 1.53 R☉
- Age
- 1.7 billion years (Sun: 4.6)
Planetary System
HAT-P-34 b is the only planet known to orbit HAT-P-34 so far.
HAT-P-34 b — Complete Data
| Radius | 13.417 Earth radii (1.197 Jupiter radii) |
|---|---|
| Mass | 1,058.37 Earth masses (3.330 Jupiter masses) |
| Density | 2.50 g/cm³ (Earth: 5.51) |
| Orbital period | 5.45 days |
| Orbital distance | 0.068 AU |
| Eccentricity | 0.432 |
| Earth Similarity Index | 0.07 |
| Distance from Earth | 813.2 light-years (249.3 parsecs) |
| Constellation | Sagitta |
| Discovery method | Transit |
| Discovery facility | HATNet |
| Discovery year | 2011 |
Data: NASA Exoplanet Archive, last updated 2020-03-13. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HAT-P-34 b
Is HAT-P-34 b habitable?
No — HAT-P-34 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-34 b?
HAT-P-34 b is about 813 light-years from Earth in the constellation Sagitta. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 14,312,320 years to get there.
How big is HAT-P-34 b compared to Earth?
HAT-P-34 b has 13.42 times the radius of Earth and about 1,058 times its mass.
How long is a year on HAT-P-34 b?
One orbit around HAT-P-34 takes 5.5 Earth days — short enough that 67 of its years would fit into one Earth year.
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