HD 130322 b
HD 130322 b is a cold gas giant orbiting HD 130322 in the constellation Virgo. It lies about 104 light-years from Earth and was discovered in 1999 using the radial velocity method.
Is HD 130322 b in the Habitable Zone?
HD 130322 b orbits inside the inner edge of the habitable zone of HD 130322. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HD 130322: 0.567–1.352 AU (conservative: 0.718–1.282 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 130322 b — one full orbit around HD 130322 — lasts 10.7 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.093 AU — closer to its star than Mercury is to the Sun. Its orbit is nearly circular (eccentricity 0.029).
How Was HD 130322 b Discovered?
HD 130322 b was discovered in 1999 using the radial velocity method, with observations from La Silla 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 130322 b?
HD 130322 b is 104.0 light-years (31.9 parsecs) from Earth. Light arriving here tonight left the planet around the year 1922. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,830,400 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. HD 130322 b scores 0.08, ranking #4,647 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 130322
HD 130322
- Surface temperature
- 5,387 K (Sun: 5,772 K)
- Mass
- 0.92 M☉
- Radius
- 0.85 R☉
Planetary System
HD 130322 b is the only planet known to orbit HD 130322 so far.
HD 130322 b — Complete Data
| Mass (best estimate) | 365.49 Earth masses |
|---|---|
| Orbital period | 10.71 days |
| Orbital distance | 0.093 AU |
| Eccentricity | 0.029 |
| Earth Similarity Index | 0.08 |
| Distance from Earth | 104.0 light-years (31.9 parsecs) |
| Constellation | Virgo |
| Discovery method | Radial Velocity |
| Discovery facility | La Silla Observatory |
| Discovery year | 1999 |
Data: NASA Exoplanet Archive, last updated 2015-02-19. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 130322 b
Is HD 130322 b habitable?
No — HD 130322 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HD 130322 b?
HD 130322 b is about 104 light-years from Earth in the constellation Virgo. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,830,400 years to get there.
How long is a year on HD 130322 b?
One orbit around HD 130322 takes 10.7 Earth days — short enough that 34 of its years would fit into one Earth year.
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