HIP 109384 b
HIP 109384 b is a cold gas giant orbiting the G5 star HIP 109384 in the constellation Cepheus. It lies about 192 light-years from Earth and was discovered in 2016 using the radial velocity method.
Is HIP 109384 b in the Habitable Zone?
The position of HIP 109384 b relative to the habitable zone of HIP 109384 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HIP 109384 b — one full orbit around HIP 109384 — lasts 499.5 Earth days, longer than an Earth year. It orbits at an average distance of 1.134 AU. Its orbit is highly elliptical (eccentricity 0.55), swinging dramatically closer to and farther from its star.
How Was HIP 109384 b Discovered?
HIP 109384 b was discovered in 2016 using the radial velocity method, with observations from Haute-Provence 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 109384 b?
HIP 109384 b is 192.3 light-years (59.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 1834. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 3,384,480 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. HIP 109384 b scores 0.33, ranking #906 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HIP 109384
HIP 109384
- Spectral type
- G5
- Surface temperature
- 5,180 K (Sun: 5,772 K)
- Mass
- 0.78 M☉
Planetary System
HIP 109384 b is the only planet known to orbit HIP 109384 so far.
HIP 109384 b — Complete Data
| Mass (best estimate) | 495.81 Earth masses |
|---|---|
| Orbital period | 499.48 days |
| Orbital distance | 1.134 AU |
| Eccentricity | 0.549 |
| Earth Similarity Index | 0.33 |
| Distance from Earth | 192.3 light-years (59.0 parsecs) |
| Constellation | Cepheus |
| Discovery method | Radial Velocity |
| Discovery facility | Haute-Provence Observatory |
| Discovery year | 2016 |
Data: NASA Exoplanet Archive, last updated 2016-02-24. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HIP 109384 b
Is HIP 109384 b habitable?
HIP 109384 b is not known to orbit within the habitable zone of HIP 109384, and as a cold gas giant it is an unlikely candidate for life as we know it.
How far away is HIP 109384 b?
HIP 109384 b is about 192 light-years from Earth in the constellation Cepheus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 3,384,480 years to get there.
How long is a year on HIP 109384 b?
One orbit around HIP 109384 takes 499.5 Earth days.
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