HATS-74 A b
HATS-74 A b is a hot Jupiter orbiting HATS-74 A in the constellation Crater. It lies about 977 light-years from Earth and was discovered in 2021 using the transit method.
How Big Is HATS-74 A b?
HATS-74 A b has a radius of 11.57 times that of Earth, or 1.03 times the radius of Jupiter. Its mass is 464 times that of Earth, giving it a density of 1.64 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is HATS-74 A b in the Habitable Zone?
HATS-74 A b orbits inside the inner edge of the habitable zone of HATS-74 A. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HATS-74 A: 0.201–0.514 AU (conservative: 0.254–0.487 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on HATS-74 A b
The equilibrium temperature of HATS-74 A b is about 895 K (622 °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 107 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on HATS-74 A b — one full orbit around HATS-74 A — lasts just 41.6 hours, shorter than Mercury's 88-day year. It orbits at an average distance of 0.024 AU — closer to its star than Mercury is to the Sun. Its orbit is nearly circular (eccentricity 0.044).
How Was HATS-74 A b Discovered?
HATS-74 A b was discovered in 2021 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-74 A b?
HATS-74 A b is 976.5 light-years (299.4 parsecs) from Earth. Light arriving here tonight left the planet around the year 1050. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 17,186,400 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-74 A b scores 0.09, ranking #4,555 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HATS-74 A
HATS-74 A b belongs to a system of 2 stars; it orbits HATS-74 A.
HATS-74 A
- Surface temperature
- 3,777 K (Sun: 5,772 K)
- Mass
- 0.60 M☉
- Radius
- 0.58 R☉
- Luminosity
- 0.0608 L☉
- Age
- 11.0 billion years (Sun: 4.6)
Planetary System
HATS-74 A b is the only planet known to orbit HATS-74 A so far.
HATS-74 A b — Complete Data
| Radius | 11.568 Earth radii (1.032 Jupiter radii) |
|---|---|
| Mass | 464.03 Earth masses (1.460 Jupiter masses) |
| Density | 1.64 g/cm³ (Earth: 5.51) |
| Orbital period | 1.73 days |
| Orbital distance | 0.024 AU |
| Eccentricity | 0.044 |
| Equilibrium temperature | 895 K (622 °C) |
| Stellar irradiation | 106.90× Earth |
| Earth Similarity Index | 0.09 |
| Distance from Earth | 976.5 light-years (299.4 parsecs) |
| Constellation | Crater |
| Discovery method | Transit |
| Discovery facility | HATSouth |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2021-12-13. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HATS-74 A b
Is HATS-74 A b habitable?
No — HATS-74 A b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HATS-74 A b?
HATS-74 A b is about 977 light-years from Earth in the constellation Crater. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 17,186,400 years to get there.
How big is HATS-74 A b compared to Earth?
HATS-74 A b has 11.57 times the radius of Earth and about 464 times its mass.
How long is a year on HATS-74 A b?
One orbit around HATS-74 A takes 1.7 Earth days — short enough that 211 of its years would fit into one Earth year.
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