HD 47366 b
HD 47366 b is a cold gas giant orbiting the K1 III star HD 47366 in the constellation Canis Major. It lies about 275 light-years from Earth and was discovered in 2016 using the radial velocity method.
Is HD 47366 b in the Habitable Zone?
HD 47366 b orbits inside the inner edge of the habitable zone of HD 47366. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HD 47366: 4.026–9.788 AU (conservative: 5.100–9.280 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 47366 b — one full orbit around HD 47366 — lasts 360.1 Earth days, between the years of Mercury (88 days) and Earth (365 days). It orbits at an average distance of 1.207 AU. Its orbit is mildly elliptical (eccentricity 0.07).
How Was HD 47366 b Discovered?
HD 47366 b was discovered in 2016 using the radial velocity method, with observations from Okayama Astrophysical 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 47366 b?
HD 47366 b is 275.1 light-years (84.4 parsecs) from Earth. Light arriving here tonight left the planet around the year 1751. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 4,841,760 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 47366 b scores 0.12, ranking #4,320 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 47366
HD 47366
- Spectral type
- K1 III
- Surface temperature
- 4,866 K (Sun: 5,772 K)
- Mass
- 1.81 M☉
- Radius
- 7.30 R☉
- Luminosity
- 26.1000 L☉
- Age
- 1.6 billion years (Sun: 4.6)
The HD 47366 Planetary System
HD 47366 b is one of 2 known planets in the HD 47366 system. Its siblings:
- HD 47366 c (Cold Gas Giant)
HD 47366 b — Complete Data
| Mass (best estimate) | 661.72 Earth masses |
|---|---|
| Orbital period | 360.08 days |
| Orbital distance | 1.207 AU |
| Eccentricity | 0.071 |
| Earth Similarity Index | 0.12 |
| Distance from Earth | 275.1 light-years (84.4 parsecs) |
| Constellation | Canis Major |
| Discovery method | Radial Velocity |
| Discovery facility | Okayama Astrophysical Observatory |
| Discovery year | 2016 |
Data: NASA Exoplanet Archive, last updated 2023-09-19. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 47366 b
Is HD 47366 b habitable?
No — HD 47366 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HD 47366 b?
HD 47366 b is about 275 light-years from Earth in the constellation Canis Major. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 4,841,760 years to get there.
How long is a year on HD 47366 b?
One orbit around HD 47366 takes 360.1 Earth days.
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