HD 290327 b
HD 290327 b is a cold gas giant orbiting HD 290327 in the constellation Orion. It lies about 184 light-years from Earth and was discovered in 2009 using the radial velocity method.
Is HD 290327 b in the Habitable Zone?
HD 290327 b orbits beyond the outer edge of the habitable zone of HD 290327. At that distance, any surface water would almost certainly be frozen.
Habitable zone of HD 290327: 0.658–1.562 AU (conservative: 0.833–1.481 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 290327 b — one full orbit around HD 290327 — lasts 2,443.0 Earth days, longer than an Earth year. It orbits at an average distance of 3.430 AU. Its orbit is mildly elliptical (eccentricity 0.08).
How Was HD 290327 b Discovered?
HD 290327 b was discovered in 2009 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 290327 b?
HD 290327 b is 184.1 light-years (56.4 parsecs) from Earth. Light arriving here tonight left the planet around the year 1842. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 3,240,160 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 290327 b scores 0.13, ranking #4,291 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 290327
HD 290327
- Surface temperature
- 5,505 K (Sun: 5,772 K)
- Mass
- 0.84 M☉
- Radius
- 0.95 R☉
Planetary System
HD 290327 b is the only planet known to orbit HD 290327 so far.
HD 290327 b — Complete Data
| Mass (best estimate) | 772.33 Earth masses |
|---|---|
| Orbital period | 2,443.00 days |
| Orbital distance | 3.430 AU |
| Eccentricity | 0.080 |
| Earth Similarity Index | 0.13 |
| Distance from Earth | 184.1 light-years (56.4 parsecs) |
| Constellation | Orion |
| Discovery method | Radial Velocity |
| Discovery facility | La Silla Observatory |
| Discovery year | 2009 |
Data: NASA Exoplanet Archive, last updated 2018-09-04. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 290327 b
Is HD 290327 b habitable?
No — HD 290327 b orbits outside the habitable zone of HD 290327 and is likely too cold for liquid water on its surface.
How far away is HD 290327 b?
HD 290327 b is about 184 light-years from Earth in the constellation Orion. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 3,240,160 years to get there.
How long is a year on HD 290327 b?
One orbit around HD 290327 takes 2,443.0 Earth days.
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