HD 3765 b
HD 3765 b is a cold gas giant orbiting HD 3765 in the constellation Andromeda. It lies about 59 light-years from Earth and was discovered in 2021 using the radial velocity method.
Is HD 3765 b in the Habitable Zone?
HD 3765 b orbits beyond the outer edge of the habitable zone of HD 3765. At that distance, any surface water would almost certainly be frozen.
Habitable zone of HD 3765: 0.496–1.196 AU (conservative: 0.628–1.134 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 3765 b — one full orbit around HD 3765 — lasts 1,211.0 Earth days, longer than an Earth year. It orbits at an average distance of 2.108 AU. Its orbit is mildly elliptical (eccentricity 0.30).
How Was HD 3765 b Discovered?
HD 3765 b was discovered in 2021 using the radial velocity method, with observations from Multiple Observatories.
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 3765 b?
HD 3765 b is 58.5 light-years (17.9 parsecs) from Earth. Light arriving here tonight left the planet around the year 1968. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,029,600 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 3765 b scores 0.19, ranking #3,994 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 3765
HD 3765
- Surface temperature
- 5,050 K (Sun: 5,772 K)
- Mass
- 0.85 M☉
- Radius
- 0.83 R☉
Planetary System
HD 3765 b is the only planet known to orbit HD 3765 so far.
HD 3765 b — Complete Data
| Mass (best estimate) | 54.98 Earth masses |
|---|---|
| Orbital period | 1,211.00 days |
| Orbital distance | 2.108 AU |
| Eccentricity | 0.298 |
| Earth Similarity Index | 0.19 |
| Distance from Earth | 58.5 light-years (17.9 parsecs) |
| Constellation | Andromeda |
| Discovery method | Radial Velocity |
| Discovery facility | Multiple Observatories |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2021-09-20. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 3765 b
Is HD 3765 b habitable?
No — HD 3765 b orbits outside the habitable zone of HD 3765 and is likely too cold for liquid water on its surface.
How far away is HD 3765 b?
HD 3765 b is about 59 light-years from Earth in the constellation Andromeda. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,029,600 years to get there.
How long is a year on HD 3765 b?
One orbit around HD 3765 takes 1,211.0 Earth days.
Explore HD 3765 b in the app
Browse, filter and compare 6,000+ exoplanets on iPhone, iPad and Apple Watch — with habitable-zone views, widgets and offline data.
