HD 105779 b
HD 105779 b is a cold gas giant orbiting the G2 star HD 105779 in the constellation Corvus. It lies about 180 light-years from Earth and was discovered in 2022 using the radial velocity method.
Is HD 105779 b in the Habitable Zone?
HD 105779 b orbits beyond the outer edge of the habitable zone of HD 105779. At that distance, any surface water would almost certainly be frozen.
Habitable zone of HD 105779: 0.662–1.560 AU (conservative: 0.839–1.479 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 105779 b — one full orbit around HD 105779 — lasts 2,412.0 Earth days, longer than an Earth year. It orbits at an average distance of 3.380 AU.
How Was HD 105779 b Discovered?
HD 105779 b was discovered in 2022 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 105779 b?
HD 105779 b is 180.2 light-years (55.2 parsecs) from Earth. Light arriving here tonight left the planet around the year 1846. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 3,171,520 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 105779 b scores 0.13, ranking #4,287 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 105779
HD 105779
- Spectral type
- G2
- Surface temperature
- 5,792 K (Sun: 5,772 K)
- Mass
- 0.89 M☉
- Radius
- 0.94 R☉
- Luminosity
- 0.7800 L☉
- Age
- 7.5 billion years (Sun: 4.6)
Planetary System
HD 105779 b is the only planet known to orbit HD 105779 so far.
HD 105779 b — Complete Data
| Mass (best estimate) | 203.41 Earth masses |
|---|---|
| Orbital period | 2,412.00 days |
| Orbital distance | 3.380 AU |
| Earth Similarity Index | 0.13 |
| Distance from Earth | 180.2 light-years (55.2 parsecs) |
| Constellation | Corvus |
| Discovery method | Radial Velocity |
| Discovery facility | La Silla Observatory |
| Discovery year | 2022 |
Data: NASA Exoplanet Archive, last updated 2022-05-09. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 105779 b
Is HD 105779 b habitable?
No — HD 105779 b orbits outside the habitable zone of HD 105779 and is likely too cold for liquid water on its surface.
How far away is HD 105779 b?
HD 105779 b is about 180 light-years from Earth in the constellation Corvus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 3,171,520 years to get there.
How long is a year on HD 105779 b?
One orbit around HD 105779 takes 2,412.0 Earth days.
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