HR 5183 b
HR 5183 b is a cold gas giant orbiting HR 5183 in the constellation Virgo. It lies about 103 light-years from Earth and was discovered in 2019 using the radial velocity method.
Is HR 5183 b in the Habitable Zone?
HR 5183 b orbits beyond the outer edge of the habitable zone of HR 5183. At that distance, any surface water would almost certainly be frozen.
Habitable zone of HR 5183: 1.153–2.716 AU (conservative: 1.461–2.575 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on HR 5183 b
The equilibrium temperature of HR 5183 b is about 171 K (-102 °C) — well below freezing. 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 HR 5183 b — one full orbit around HR 5183 — lasts 27,000.0 Earth days, longer than Jupiter's 12-year orbit. It orbits at an average distance of 18.000 AU. Its orbit is highly elliptical (eccentricity 0.84), swinging dramatically closer to and farther from its star.
How Was HR 5183 b Discovered?
HR 5183 b was discovered in 2019 using the radial velocity method, with observations from Multiple Observatories.
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 HR 5183 b?
HR 5183 b is 102.6 light-years (31.5 parsecs) from Earth. Light arriving here tonight left the planet around the year 1924. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,805,760 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. HR 5183 b scores 0.08, ranking #4,609 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HR 5183
HR 5183 b belongs to a system of 2 stars; it orbits HR 5183.
HR 5183
- Surface temperature
- 5,794 K (Sun: 5,772 K)
- Mass
- 1.07 M☉
- Radius
- 1.53 R☉
- Age
- 7.7 billion years (Sun: 4.6)
Planetary System
HR 5183 b is the only planet known to orbit HR 5183 so far.
HR 5183 b — Complete Data
| Mass (best estimate) | 1,026.59 Earth masses |
|---|---|
| Orbital period | 27,000.00 days |
| Orbital distance | 18.000 AU |
| Eccentricity | 0.840 |
| Equilibrium temperature | 171 K (-102 °C) |
| Earth Similarity Index | 0.08 |
| Distance from Earth | 102.6 light-years (31.5 parsecs) |
| Constellation | Virgo |
| Discovery method | Radial Velocity |
| Discovery facility | Multiple Observatories |
| Discovery year | 2019 |
Data: NASA Exoplanet Archive, last updated 2019-09-23. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HR 5183 b
Is HR 5183 b habitable?
No — HR 5183 b orbits outside the habitable zone of HR 5183 and is likely too cold for liquid water on its surface.
How far away is HR 5183 b?
HR 5183 b is about 103 light-years from Earth in the constellation Virgo. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,805,760 years to get there.
How long is a year on HR 5183 b?
One orbit around HR 5183 takes 27,000.0 Earth days.
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