HD 65216 b
HD 65216 b is a cold gas giant orbiting HD 65216 in the constellation Carina. It lies about 115 light-years from Earth and was discovered in 2003 using the radial velocity method.
Is HD 65216 b in the Habitable Zone?
The position of HD 65216 b relative to the habitable zone of HD 65216 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HD 65216 b — one full orbit around HD 65216 — lasts 577.6 Earth days, longer than an Earth year. It orbits at an average distance of 1.301 AU. Its orbit is mildly elliptical (eccentricity 0.27).
How Was HD 65216 b Discovered?
HD 65216 b was discovered in 2003 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 65216 b?
HD 65216 b is 114.5 light-years (35.1 parsecs) from Earth. Light arriving here tonight left the planet around the year 1912. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,015,200 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 65216 b scores 0.33, ranking #938 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 65216
HD 65216 b belongs to a system of 3 stars; it orbits HD 65216.
HD 65216
- Surface temperature
- 5,612 K (Sun: 5,772 K)
- Mass
- 0.87 M☉
The HD 65216 Planetary System
HD 65216 b is one of 2 known planets in the HD 65216 system. Its siblings:
- HD 65216 c (Cold Gas Giant)
HD 65216 b — Complete Data
| Mass (best estimate) | 411.59 Earth masses |
|---|---|
| Orbital period | 577.60 days |
| Orbital distance | 1.301 AU |
| Eccentricity | 0.270 |
| Earth Similarity Index | 0.33 |
| Distance from Earth | 114.5 light-years (35.1 parsecs) |
| Constellation | Carina |
| Discovery method | Radial Velocity |
| Discovery facility | La Silla Observatory |
| Discovery year | 2003 |
Data: NASA Exoplanet Archive, last updated 2019-03-11. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 65216 b
Is HD 65216 b habitable?
HD 65216 b is not known to orbit within the habitable zone of HD 65216, and as a cold gas giant it is an unlikely candidate for life as we know it.
How far away is HD 65216 b?
HD 65216 b is about 115 light-years from Earth in the constellation Carina. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,015,200 years to get there.
How long is a year on HD 65216 b?
One orbit around HD 65216 takes 577.6 Earth days.
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