HATS-59 c
HATS-59 c is a exoplanet orbiting HATS-59 in the constellation Crater. It lies about 2,097 light-years from Earth and was discovered in 2018 using the radial velocity method.
Is HATS-59 c in the Habitable Zone?
HATS-59 c orbits beyond the outer edge of the habitable zone of HATS-59. At that distance, any surface water would almost certainly be frozen.
Habitable zone of HATS-59: 0.752–1.776 AU (conservative: 0.952–1.684 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on HATS-59 c
The equilibrium temperature of HATS-59 c is about 176 K (-97 °C) — well below freezing. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C. It receives 0.16 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on HATS-59 c — one full orbit around HATS-59 — lasts 1,422.0 Earth days, longer than an Earth year. It orbits at an average distance of 2.504 AU. Its orbit is mildly elliptical (eccentricity 0.08).
How Was HATS-59 c Discovered?
HATS-59 c was discovered in 2018 using the radial velocity method, with observations from HATSouth.
The radial velocity method measures the subtle wobble of a star caused by the gravitational pull of an orbiting planet, visible as periodic shifts in the star's light spectrum. The size of the wobble reveals the planet's minimum mass.
How Far Away Is HATS-59 c?
HATS-59 c is 2,096.8 light-years (642.9 parsecs) from Earth. Light arriving here tonight left the planet about 2,097 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 36,903,680 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-59 c scores 0.21, ranking #3,777 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HATS-59
HATS-59
- Surface temperature
- 5,670 K (Sun: 5,772 K)
- Mass
- 1.04 M☉
- Radius
- 1.04 R☉
- Luminosity
- 0.9900 L☉
- Age
- 4.3 billion years (Sun: 4.6)
The HATS-59 Planetary System
HATS-59 c is one of 2 known planets in the HATS-59 system. Its siblings:
- HATS-59 b (Hot Jupiter)
HATS-59 c — Complete Data
| Mass (best estimate) | 4,036.44 Earth masses |
|---|---|
| Orbital period | 1,422.00 days |
| Orbital distance | 2.504 AU |
| Eccentricity | 0.083 |
| Equilibrium temperature | 176 K (-97 °C) |
| Stellar irradiation | 0.16× Earth |
| Earth Similarity Index | 0.21 |
| Distance from Earth | 2,096.8 light-years (642.9 parsecs) |
| Constellation | Crater |
| Discovery method | Radial Velocity |
| Discovery facility | HATSouth |
| Discovery year | 2018 |
Data: NASA Exoplanet Archive, last updated 2018-12-03. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HATS-59 c
Is HATS-59 c habitable?
No — HATS-59 c orbits outside the habitable zone of HATS-59 and is likely too cold for liquid water on its surface.
How far away is HATS-59 c?
HATS-59 c is about 2,097 light-years from Earth in the constellation Crater. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 36,903,680 years to get there.
How long is a year on HATS-59 c?
One orbit around HATS-59 takes 1,422.0 Earth days.
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