HD 219077 b
HD 219077 b is a cold gas giant orbiting HD 219077 in the constellation Tucana. It lies about 95 light-years from Earth and was discovered in 2012 using the radial velocity method.
Is HD 219077 b in the Habitable Zone?
The position of HD 219077 b relative to the habitable zone of HD 219077 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HD 219077 b — one full orbit around HD 219077 — lasts 5,478.7 Earth days, longer than Jupiter's 12-year orbit. It orbits at an average distance of 5.935 AU. Its orbit is highly elliptical (eccentricity 0.77), swinging dramatically closer to and farther from its star.
How Was HD 219077 b Discovered?
HD 219077 b was discovered in 2012 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 219077 b?
HD 219077 b is 95.2 light-years (29.2 parsecs) from Earth. Light arriving here tonight left the planet around the year 1931. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,675,520 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 219077 b scores 0.18, ranking #4,042 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 219077
HD 219077
- Mass
- 0.92 M☉
Planetary System
HD 219077 b is the only planet known to orbit HD 219077 so far.
HD 219077 b — Complete Data
| Mass | 3,057.51 Earth masses (9.620 Jupiter masses) |
|---|---|
| Orbital period | 5,478.69 days |
| Orbital distance | 5.935 AU |
| Eccentricity | 0.768 |
| Earth Similarity Index | 0.18 |
| Distance from Earth | 95.2 light-years (29.2 parsecs) |
| Constellation | Tucana |
| Discovery method | Radial Velocity |
| Discovery facility | La Silla Observatory |
| Discovery year | 2012 |
Data: NASA Exoplanet Archive, last updated 2023-06-12. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 219077 b
Is HD 219077 b habitable?
HD 219077 b is not known to orbit within the habitable zone of HD 219077, and as a cold gas giant it is an unlikely candidate for life as we know it.
How far away is HD 219077 b?
HD 219077 b is about 95 light-years from Earth in the constellation Tucana. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,675,520 years to get there.
How long is a year on HD 219077 b?
One orbit around HD 219077 takes 5,478.7 Earth days.
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