HD 5319 b
HD 5319 b is a cold gas giant orbiting HD 5319 in the constellation Cetus. It lies about 396 light-years from Earth and was discovered in 2007 using the radial velocity method.
Is HD 5319 b in the Habitable Zone?
HD 5319 b orbits inside the inner edge of the habitable zone of HD 5319. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HD 5319: 2.274–5.526 AU (conservative: 2.880–5.239 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Orbit and Year Length
A year on HD 5319 b — one full orbit around HD 5319 — lasts 637.1 Earth days, longer than an Earth year. It orbits at an average distance of 1.570 AU. Its orbit is mildly elliptical (eccentricity 0.09).
How Was HD 5319 b Discovered?
HD 5319 b was discovered in 2007 using the radial velocity method, with observations from W. M. Keck Observatory.
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 HD 5319 b?
HD 5319 b is 396.0 light-years (121.4 parsecs) from Earth. Light arriving here tonight left the planet around the year 1630. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 6,969,600 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. HD 5319 b scores 0.36, ranking #688 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 5319
HD 5319
- Surface temperature
- 4,871 K (Sun: 5,772 K)
- Mass
- 1.27 M☉
- Radius
- 4.06 R☉
The HD 5319 Planetary System
HD 5319 b is one of 2 known planets in the HD 5319 system. Its siblings:
- HD 5319 c (Cold Gas Giant)
HD 5319 b — Complete Data
| Mass (best estimate) | 494.54 Earth masses |
|---|---|
| Orbital period | 637.10 days |
| Orbital distance | 1.570 AU |
| Eccentricity | 0.092 |
| Earth Similarity Index | 0.36 |
| Distance from Earth | 396.0 light-years (121.4 parsecs) |
| Constellation | Cetus |
| Discovery method | Radial Velocity |
| Discovery facility | W. M. Keck Observatory |
| Discovery year | 2007 |
Data: NASA Exoplanet Archive, last updated 2018-12-03. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 5319 b
Is HD 5319 b habitable?
No — HD 5319 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HD 5319 b?
HD 5319 b is about 396 light-years from Earth in the constellation Cetus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 6,969,600 years to get there.
How long is a year on HD 5319 b?
One orbit around HD 5319 takes 637.1 Earth days.
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