HD 89307 b
HD 89307 b is a cold gas giant orbiting HD 89307 in the constellation Leo. It lies about 104 light-years from Earth and was discovered in 2009 using the radial velocity method.
Is HD 89307 b in the Habitable Zone?
HD 89307 b orbits beyond the outer edge of the habitable zone of HD 89307. At that distance, any surface water would almost certainly be frozen.
Habitable zone of HD 89307: 0.868–2.035 AU (conservative: 1.099–1.929 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Orbit and Year Length
A year on HD 89307 b — one full orbit around HD 89307 — lasts 2,166.0 Earth days, longer than an Earth year. It orbits at an average distance of 3.270 AU. Its orbit is mildly elliptical (eccentricity 0.20).
How Was HD 89307 b Discovered?
HD 89307 b was discovered in 2009 using the radial velocity method, with observations from Lick 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 89307 b?
HD 89307 b is 104.4 light-years (32.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 1922. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,837,440 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 89307 b scores 0.18, ranking #4,026 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 89307
HD 89307
- Surface temperature
- 5,955 K (Sun: 5,772 K)
- Mass
- 1.27 M☉
- Radius
- 1.10 R☉
Planetary System
HD 89307 b is the only planet known to orbit HD 89307 so far.
HD 89307 b — Complete Data
| Mass (best estimate) | 670.62 Earth masses |
|---|---|
| Orbital period | 2,166.00 days |
| Orbital distance | 3.270 AU |
| Eccentricity | 0.200 |
| Earth Similarity Index | 0.18 |
| Distance from Earth | 104.4 light-years (32.0 parsecs) |
| Constellation | Leo |
| Discovery method | Radial Velocity |
| Discovery facility | Lick Observatory |
| Discovery year | 2009 |
Data: NASA Exoplanet Archive, last updated 2018-09-04. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 89307 b
Is HD 89307 b habitable?
No — HD 89307 b orbits outside the habitable zone of HD 89307 and is likely too cold for liquid water on its surface.
How far away is HD 89307 b?
HD 89307 b is about 104 light-years from Earth in the constellation Leo. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,837,440 years to get there.
How long is a year on HD 89307 b?
One orbit around HD 89307 takes 2,166.0 Earth days.
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