HIP 91258 b
HIP 91258 b is a hot Jupiter orbiting HIP 91258 in the constellation Draco. It lies about 150 light-years from Earth and was discovered in 2013 using the radial velocity method.
Is HIP 91258 b in the Habitable Zone?
HIP 91258 b orbits inside the inner edge of the habitable zone of HIP 91258. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HIP 91258: 0.619–1.469 AU (conservative: 0.784–1.392 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Orbit and Year Length
A year on HIP 91258 b — one full orbit around HIP 91258 — lasts 5.05 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.060 AU — closer to its star than Mercury is to the Sun. Its orbit is nearly circular (eccentricity 0.020).
How Was HIP 91258 b Discovered?
HIP 91258 b was discovered in 2013 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 91258 b?
HIP 91258 b is 149.7 light-years (45.9 parsecs) from Earth. Light arriving here tonight left the planet around the year 1877. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,634,720 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 91258 b scores 0.07, ranking #4,891 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HIP 91258
HIP 91258
- Surface temperature
- 5,519 K (Sun: 5,772 K)
- Mass
- 0.97 M☉
- Radius
- 0.89 R☉
Planetary System
HIP 91258 b is the only planet known to orbit HIP 91258 so far.
HIP 91258 b — Complete Data
| Mass (best estimate) | 346.43 Earth masses |
|---|---|
| Orbital period | 5.05 days |
| Orbital distance | 0.060 AU |
| Eccentricity | 0.020 |
| Earth Similarity Index | 0.07 |
| Distance from Earth | 149.7 light-years (45.9 parsecs) |
| Constellation | Draco |
| Discovery method | Radial Velocity |
| Discovery facility | Haute-Provence Observatory |
| Discovery year | 2013 |
Data: NASA Exoplanet Archive, last updated 2018-09-04. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HIP 91258 b
Is HIP 91258 b habitable?
No — HIP 91258 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HIP 91258 b?
HIP 91258 b is about 150 light-years from Earth in the constellation Draco. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,634,720 years to get there.
How long is a year on HIP 91258 b?
One orbit around HIP 91258 takes 5.1 Earth days — short enough that 72 of its years would fit into one Earth year.
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