HD 109988 b
HD 109988 b is a exoplanet orbiting HD 109988 in the constellation Hydra. It lies about 139 light-years from Earth and was discovered in 2022 using the radial velocity method.
Is HD 109988 b in the Habitable Zone?
The position of HD 109988 b relative to the habitable zone of HD 109988 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HD 109988 b — one full orbit around HD 109988 — lasts 17,132.2 Earth days, longer than Jupiter's 12-year orbit. It orbits at an average distance of 12.518 AU. Its orbit is mildly elliptical (eccentricity 0.06).
How Was HD 109988 b Discovered?
HD 109988 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 109988 b?
HD 109988 b is 138.7 light-years (42.5 parsecs) from Earth. Light arriving here tonight left the planet around the year 1888. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,441,120 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 109988 b scores 0.08, ranking #4,752 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 109988
HD 109988
- Mass
- 0.88 M☉
Planetary System
HD 109988 b is the only planet known to orbit HD 109988 so far.
HD 109988 b — Complete Data
| Mass | 6,935.33 Earth masses (21.821 Jupiter masses) |
|---|---|
| Orbital period | 17,132.16 days |
| Orbital distance | 12.518 AU |
| Eccentricity | 0.056 |
| Earth Similarity Index | 0.08 |
| Distance from Earth | 138.7 light-years (42.5 parsecs) |
| Constellation | Hydra |
| 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 109988 b
Is HD 109988 b habitable?
HD 109988 b is not known to orbit within the habitable zone of HD 109988.
How far away is HD 109988 b?
HD 109988 b is about 139 light-years from Earth in the constellation Hydra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,441,120 years to get there.
How long is a year on HD 109988 b?
One orbit around HD 109988 takes 17,132.2 Earth days.
Explore HD 109988 b in the app
Browse, filter and compare 6,000+ exoplanets on iPhone, iPad and Apple Watch — with habitable-zone views, widgets and offline data.
