HAT-P-70 b
HAT-P-70 b is a hot Jupiter orbiting HAT-P-70 in the constellation Orion. It lies about 1,079 light-years from Earth and was discovered in 2019 using the transit method.
How Big Is HAT-P-70 b?
HAT-P-70 b has a radius of 20.96 times that of Earth, or 1.87 times the radius of Jupiter. Its mass is 2,155 times that of Earth, giving it a density of 1.54 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is HAT-P-70 b in the Habitable Zone?
The position of HAT-P-70 b relative to the habitable zone of HAT-P-70 cannot be precisely determined from the available orbital data.
Temperature on HAT-P-70 b
The equilibrium temperature of HAT-P-70 b is about 2,562 K (2,289 °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-70 b — one full orbit around HAT-P-70 — lasts 2.74 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.047 AU — closer to its star than Mercury is to the Sun.
How Was HAT-P-70 b Discovered?
HAT-P-70 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-70 b?
HAT-P-70 b is 1,078.7 light-years (330.7 parsecs) from Earth. Light arriving here tonight left the planet about 1,079 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 18,985,120 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-70 b scores 0.04, ranking #5,310 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HAT-P-70
HAT-P-70
- Surface temperature
- 8,450 K (Sun: 5,772 K)
- Mass
- 1.89 M☉
- Radius
- 1.86 R☉
- Luminosity
- 16.7001 L☉
- Age
- 0.6 billion years (Sun: 4.6)
Planetary System
HAT-P-70 b is the only planet known to orbit HAT-P-70 so far.
HAT-P-70 b — Complete Data
| Radius | 20.961 Earth radii (1.870 Jupiter radii) |
|---|---|
| Mass | 2,154.89 Earth masses (6.780 Jupiter masses) |
| Density | 1.54 g/cm³ (Earth: 5.51) |
| Orbital period | 2.74 days |
| Orbital distance | 0.047 AU |
| Equilibrium temperature | 2,562 K (2,289 °C) |
| Earth Similarity Index | 0.04 |
| Distance from Earth | 1,078.7 light-years (330.7 parsecs) |
| Constellation | Orion |
| 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-70 b
Is HAT-P-70 b habitable?
HAT-P-70 b is not known to orbit within the habitable zone of HAT-P-70, and as a hot Jupiter it is an unlikely candidate for life as we know it.
How far away is HAT-P-70 b?
HAT-P-70 b is about 1,079 light-years from Earth in the constellation Orion. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 18,985,120 years to get there.
How big is HAT-P-70 b compared to Earth?
HAT-P-70 b has 20.96 times the radius of Earth and about 2,155 times its mass.
How long is a year on HAT-P-70 b?
One orbit around HAT-P-70 takes 2.7 Earth days — short enough that 133 of its years would fit into one Earth year.
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