HIP 86221 b
HIP 86221 b is a hot Jupiter orbiting the K5 V star HIP 86221 in the constellation Hercules. It lies about 96 light-years from Earth and was discovered in 2021 using the radial velocity method.
Is HIP 86221 b in the Habitable Zone?
The position of HIP 86221 b relative to the habitable zone of HIP 86221 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HIP 86221 b — one full orbit around HIP 86221 — lasts 2.22 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.031 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.09).
How Was HIP 86221 b Discovered?
HIP 86221 b was discovered in 2021 using the radial velocity method, with observations from Cerro Tololo Inter-American 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 HIP 86221 b?
HIP 86221 b is 96.2 light-years (29.5 parsecs) from Earth. Light arriving here tonight left the planet around the year 1930. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,693,120 years to make the journey.
The Host Star: HIP 86221
HIP 86221
- Spectral type
- K5 V
- Mass
- 0.79 M☉
Planetary System
HIP 86221 b is the only planet known to orbit HIP 86221 so far.
HIP 86221 b — Complete Data
| Mass (best estimate) | 225.66 Earth masses |
|---|---|
| Orbital period | 2.22 days |
| Orbital distance | 0.031 AU |
| Eccentricity | 0.086 |
| Distance from Earth | 96.2 light-years (29.5 parsecs) |
| Constellation | Hercules |
| Discovery method | Radial Velocity |
| Discovery facility | Cerro Tololo Inter-American Observatory |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2022-01-10. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HIP 86221 b
Is HIP 86221 b habitable?
HIP 86221 b is not known to orbit within the habitable zone of HIP 86221, and as a hot Jupiter it is an unlikely candidate for life as we know it.
How far away is HIP 86221 b?
HIP 86221 b is about 96 light-years from Earth in the constellation Hercules. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,693,120 years to get there.
How long is a year on HIP 86221 b?
One orbit around HIP 86221 takes 2.2 Earth days — short enough that 164 of its years would fit into one Earth year.
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