HATS-2 b
HATS-2 b is a hot Jupiter orbiting HATS-2 in the constellation Crater. It lies about 1,115 light-years from Earth and was discovered in 2013 using the transit method.
How Big Is HATS-2 b?
HATS-2 b has a radius of 12.58 times that of Earth, or 1.12 times the radius of Jupiter. Its mass is 435 times that of Earth, giving it a density of 1.21 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is HATS-2 b in the Habitable Zone?
The position of HATS-2 b relative to the habitable zone of HATS-2 cannot be precisely determined from the available orbital data.
Temperature on HATS-2 b
The equilibrium temperature of HATS-2 b is about 1,550 K (1,277 °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 HATS-2 b — one full orbit around HATS-2 — lasts just 32.5 hours, shorter than Mercury's 88-day year. It orbits at an average distance of 0.023 AU — closer to its star than Mercury is to the Sun.
How Was HATS-2 b Discovered?
HATS-2 b was discovered in 2013 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-2 b?
HATS-2 b is 1,115.2 light-years (341.9 parsecs) from Earth. Light arriving here tonight left the planet about 1,115 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 19,627,520 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-2 b scores 0.07, ranking #4,956 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HATS-2
HATS-2
- Mass
- 0.90 M☉
- Radius
- 0.88 R☉
- Age
- 7.2 billion years (Sun: 4.6)
Planetary System
HATS-2 b is the only planet known to orbit HATS-2 so far.
HATS-2 b — Complete Data
| Radius | 12.576 Earth radii (1.122 Jupiter radii) |
|---|---|
| Mass | 435.42 Earth masses (1.370 Jupiter masses) |
| Density | 1.21 g/cm³ (Earth: 5.51) |
| Orbital period | 1.35 days |
| Orbital distance | 0.023 AU |
| Equilibrium temperature | 1,550 K (1,277 °C) |
| Earth Similarity Index | 0.07 |
| Distance from Earth | 1,115.2 light-years (341.9 parsecs) |
| Constellation | Crater |
| Discovery method | Transit |
| Discovery facility | HATSouth |
| Discovery year | 2013 |
Data: NASA Exoplanet Archive, last updated 2024-04-10. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HATS-2 b
Is HATS-2 b habitable?
HATS-2 b is not known to orbit within the habitable zone of HATS-2, and as a hot Jupiter it is an unlikely candidate for life as we know it.
How far away is HATS-2 b?
HATS-2 b is about 1,115 light-years from Earth in the constellation Crater. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 19,627,520 years to get there.
How big is HATS-2 b compared to Earth?
HATS-2 b has 12.58 times the radius of Earth and about 435 times its mass.
How long is a year on HATS-2 b?
One orbit around HATS-2 takes 1.4 Earth days — short enough that 270 of its years would fit into one Earth year.
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