HD 95089 b
HD 95089 b is a cold gas giant orbiting HD 95089 in the constellation Leo. It lies about 447 light-years from Earth and was discovered in 2009 using the radial velocity method.
Is HD 95089 b in the Habitable Zone?
HD 95089 b orbits inside the inner edge of the habitable zone of HD 95089. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HD 95089: 2.894–7.020 AU (conservative: 3.665–6.655 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 HD 95089 b — one full orbit around HD 95089 — lasts 464.4 Earth days, longer than an Earth year. It orbits at an average distance of 1.360 AU. Its orbit is mildly elliptical (eccentricity 0.12).
How Was HD 95089 b Discovered?
HD 95089 b was discovered in 2009 using the radial velocity method, with observations from W. M. Keck 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 HD 95089 b?
HD 95089 b is 446.7 light-years (137.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 1580. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 7,861,920 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 95089 b scores 0.19, ranking #4,000 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 95089
HD 95089
- Surface temperature
- 4,918 K (Sun: 5,772 K)
- Mass
- 1.54 M☉
- Radius
- 5.08 R☉
The HD 95089 Planetary System
HD 95089 b is one of 2 known planets in the HD 95089 system. Its siblings:
- HD 95089 c (Cold Gas Giant)
HD 95089 b — Complete Data
| Mass (best estimate) | 400.47 Earth masses |
|---|---|
| Orbital period | 464.40 days |
| Orbital distance | 1.360 AU |
| Eccentricity | 0.119 |
| Earth Similarity Index | 0.19 |
| Distance from Earth | 446.7 light-years (137.0 parsecs) |
| Constellation | Leo |
| Discovery method | Radial Velocity |
| Discovery facility | W. M. Keck Observatory |
| Discovery year | 2009 |
Data: NASA Exoplanet Archive, last updated 2018-12-03. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 95089 b
Is HD 95089 b habitable?
No — HD 95089 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HD 95089 b?
HD 95089 b is about 447 light-years from Earth in the constellation Leo. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 7,861,920 years to get there.
How long is a year on HD 95089 b?
One orbit around HD 95089 takes 464.4 Earth days.
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