HATS-70 b
HATS-70 b is a hot Jupiter orbiting HATS-70 in the constellation Canis Major. It lies about 4,758 light-years from Earth and was discovered in 2019 using the transit method.
How Big Is HATS-70 b?
HATS-70 b has a radius of 15.51 times that of Earth, or 1.38 times the radius of Jupiter. Its mass is 4,100 times that of Earth, giving it a density of 6.64 g/cm³ — comparable to rocky planets like Earth (5.51 g/cm³).
Is HATS-70 b in the Habitable Zone?
The position of HATS-70 b relative to the habitable zone of HATS-70 cannot be precisely determined from the available orbital data.
Temperature on HATS-70 b
The equilibrium temperature of HATS-70 b is about 2,730 K (2,457 °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 9,110 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on HATS-70 b — one full orbit around HATS-70 — lasts just 45.3 hours, shorter than Mercury's 88-day year. It orbits at an average distance of 0.036 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.18).
How Was HATS-70 b Discovered?
HATS-70 b was discovered in 2019 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-70 b?
HATS-70 b is 4,758.1 light-years (1,458.8 parsecs) from Earth. Light arriving here tonight left the planet about 4,758 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 83,742,560 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-70 b scores 0.06, ranking #5,170 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HATS-70
HATS-70
- Surface temperature
- 7,930 K (Sun: 5,772 K)
- Mass
- 1.78 M☉
- Radius
- 1.88 R☉
- Luminosity
- 12.0000 L☉
- Age
- 0.8 billion years (Sun: 4.6)
Planetary System
HATS-70 b is the only planet known to orbit HATS-70 so far.
HATS-70 b — Complete Data
| Radius | 15.513 Earth radii (1.384 Jupiter radii) |
|---|---|
| Mass | 4,100.01 Earth masses (12.900 Jupiter masses) |
| Density | 6.64 g/cm³ (Earth: 5.51) |
| Orbital period | 1.89 days |
| Orbital distance | 0.036 AU |
| Eccentricity | 0.180 |
| Equilibrium temperature | 2,730 K (2,457 °C) |
| Stellar irradiation | 9,110.00× Earth |
| Earth Similarity Index | 0.06 |
| Distance from Earth | 4,758.1 light-years (1,458.8 parsecs) |
| Constellation | Canis Major |
| Discovery method | Transit |
| Discovery facility | HATSouth |
| Discovery year | 2019 |
Data: NASA Exoplanet Archive, last updated 2019-12-02. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HATS-70 b
Is HATS-70 b habitable?
HATS-70 b is not known to orbit within the habitable zone of HATS-70, and as a hot Jupiter it is an unlikely candidate for life as we know it.
How far away is HATS-70 b?
HATS-70 b is about 4,758 light-years from Earth in the constellation Canis Major. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 83,742,560 years to get there.
How big is HATS-70 b compared to Earth?
HATS-70 b has 15.51 times the radius of Earth and about 4,100 times its mass.
How long is a year on HATS-70 b?
One orbit around HATS-70 takes 1.9 Earth days — short enough that 193 of its years would fit into one Earth year.
Explore HATS-70 b in the app
Browse, filter and compare 6,000+ exoplanets on iPhone, iPad and Apple Watch — with habitable-zone views, widgets and offline data.
