HD 457 b
HD 457 b is a exoplanet orbiting HD 457 in the constellation Phoenix. It lies about 180 light-years from Earth and was discovered in 2022 using the radial velocity method.
Is HD 457 b in the Habitable Zone?
The position of HD 457 b relative to the habitable zone of HD 457 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HD 457 b — one full orbit around HD 457 — lasts 20,324.6 Earth days, longer than Jupiter's 12-year orbit. It orbits at an average distance of 15.369 AU. Its orbit is highly elliptical (eccentricity 0.56), swinging dramatically closer to and farther from its star.
How Was HD 457 b Discovered?
HD 457 b was discovered in 2022 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 HD 457 b?
HD 457 b is 179.5 light-years (55.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 1847. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 3,159,200 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 457 b scores 0.09, ranking #4,562 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 457
HD 457
- Mass
- 1.15 M☉
Planetary System
HD 457 b is the only planet known to orbit HD 457 so far.
HD 457 b — Complete Data
| Mass | 8,445.34 Earth masses (26.572 Jupiter masses) |
|---|---|
| Orbital period | 20,324.58 days |
| Orbital distance | 15.369 AU |
| Eccentricity | 0.565 |
| Earth Similarity Index | 0.09 |
| Distance from Earth | 179.5 light-years (55.0 parsecs) |
| Constellation | Phoenix |
| Discovery method | Radial Velocity |
| Discovery facility | Multiple Observatories |
| Discovery year | 2022 |
Data: NASA Exoplanet Archive, last updated 2023-06-12. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 457 b
Is HD 457 b habitable?
HD 457 b is not known to orbit within the habitable zone of HD 457.
How far away is HD 457 b?
HD 457 b is about 180 light-years from Earth in the constellation Phoenix. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 3,159,200 years to get there.
How long is a year on HD 457 b?
One orbit around HD 457 takes 20,324.6 Earth days.
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