HIP 105854 b
HIP 105854 b is a cold gas giant orbiting the K2 III star HIP 105854 in the constellation Microscopium. It lies about 257 light-years from Earth and was discovered in 2014 using the radial velocity method.
Is HIP 105854 b in the Habitable Zone?
HIP 105854 b orbits inside the inner edge of the habitable zone of HIP 105854. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HIP 105854: 5.410–13.200 AU (conservative: 6.853–12.515 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
See the full interactive habitable-zone view in the Exoplanet Explorer app ›
Orbit and Year Length
A year on HIP 105854 b — one full orbit around HIP 105854 — lasts 184.2 Earth days, between the years of Mercury (88 days) and Earth (365 days). It orbits at an average distance of 0.810 AU — comparable to the inner Solar System. Its orbit is nearly circular (eccentricity 0.020).
How Was HIP 105854 b Discovered?
HIP 105854 b was discovered in 2014 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 HIP 105854 b?
HIP 105854 b is 256.5 light-years (78.6 parsecs) from Earth. Light arriving here tonight left the planet around the year 1770. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 4,514,400 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 105854 b scores 0.09, ranking #4,564 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HIP 105854
HIP 105854
- Spectral type
- K2 III
- Surface temperature
- 4,780 K (Sun: 5,772 K)
- Mass
- 2.10 M☉
- Luminosity
- 46.7735 L☉
Planetary System
HIP 105854 b is the only planet known to orbit HIP 105854 so far.
HIP 105854 b — Complete Data
| Mass (best estimate) | 2,606.10 Earth masses |
|---|---|
| Orbital period | 184.20 days |
| Orbital distance | 0.810 AU |
| Eccentricity | 0.020 |
| Earth Similarity Index | 0.09 |
| Distance from Earth | 256.5 light-years (78.6 parsecs) |
| Constellation | Microscopium |
| Discovery method | Radial Velocity |
| Discovery facility | Multiple Observatories |
| Discovery year | 2014 |
Data: NASA Exoplanet Archive, last updated 2014-06-11. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HIP 105854 b
Is HIP 105854 b habitable?
No — HIP 105854 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HIP 105854 b?
HIP 105854 b is about 257 light-years from Earth in the constellation Microscopium. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 4,514,400 years to get there.
How long is a year on HIP 105854 b?
One orbit around HIP 105854 takes 184.2 Earth days.
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