HD 63765 b
HD 63765 b is a cold gas giant orbiting HD 63765 in the constellation Carina. It lies about 106 light-years from Earth and was discovered in 2009 using the radial velocity method. It orbits within the habitable zone of its star — the region where liquid water could exist on a planet's surface.
Is HD 63765 b in the Habitable Zone?
HD 63765 b orbits inside the conservative habitable zone of HD 63765 — the region where a rocky planet could sustain liquid water on its surface. This makes it one of the most interesting known exoplanets in the search for life.
Habitable zone of HD 63765: 0.565–1.343 AU (conservative: 0.715–1.274 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 63765 b — one full orbit around HD 63765 — lasts 358.0 Earth days, between the years of Mercury (88 days) and Earth (365 days). It orbits at an average distance of 0.940 AU — comparable to the inner Solar System. Its orbit is mildly elliptical (eccentricity 0.24).
How Was HD 63765 b Discovered?
HD 63765 b was discovered in 2009 using the radial velocity method, with observations from La Silla 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 63765 b?
HD 63765 b is 106.1 light-years (32.5 parsecs) from Earth. Light arriving here tonight left the planet around the year 1920. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,867,360 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 63765 b scores 0.37, ranking #644 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 63765
HD 63765
- Surface temperature
- 5,449 K (Sun: 5,772 K)
- Mass
- 0.65 M☉
- Radius
- 0.83 R☉
Planetary System
HD 63765 b is the only planet known to orbit HD 63765 so far.
HD 63765 b — Complete Data
| Mass (best estimate) | 168.45 Earth masses |
|---|---|
| Orbital period | 358.00 days |
| Orbital distance | 0.940 AU |
| Eccentricity | 0.240 |
| Earth Similarity Index | 0.37 |
| Distance from Earth | 106.1 light-years (32.5 parsecs) |
| Constellation | Carina |
| Discovery method | Radial Velocity |
| Discovery facility | La Silla Observatory |
| Discovery year | 2009 |
Data: NASA Exoplanet Archive, last updated 2018-09-04. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 63765 b
Is HD 63765 b habitable?
HD 63765 b orbits within the habitable zone of HD 63765, the region where liquid water could exist on a planet's surface. It sits in the conservative habitable zone — the most promising region for habitability. Whether it is actually habitable depends on its atmosphere and composition, which remain unknown.
How far away is HD 63765 b?
HD 63765 b is about 106 light-years from Earth in the constellation Carina. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,867,360 years to get there.
How long is a year on HD 63765 b?
One orbit around HD 63765 takes 358.0 Earth days.
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