Gaia-5 b
Gaia-5 b is a exoplanet orbiting Gaia-5 in the constellation Cygnus. It lies about 134 light-years from Earth and was discovered in 2025 using the astrometry method.
Is Gaia-5 b in the Habitable Zone?
The position of Gaia-5 b relative to the habitable zone of Gaia-5 cannot be precisely determined from the available orbital data.
Habitable zone of Gaia-5: 0.100–0.260 AU (conservative: 0.127–0.247 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 Gaia-5 b — one full orbit around Gaia-5 — lasts 358.6 Earth days, between the years of Mercury (88 days) and Earth (365 days). Its orbit is highly elliptical (eccentricity 0.64), swinging dramatically closer to and farther from its star.
How Was Gaia-5 b Discovered?
Gaia-5 b was discovered in 2025 using the astrometry method, with observations from European Space Agency (ESA) Gaia Satellite.
Astrometry detects a planet by measuring the tiny periodic shift in a star's position on the sky as the star and planet orbit their common center of mass.
How Far Away Is Gaia-5 b?
Gaia-5 b is 134.3 light-years (41.2 parsecs) from Earth. Light arriving here tonight left the planet around the year 1892. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,363,680 years to make the journey.
The Host Star: Gaia-5
Gaia-5
- Surface temperature
- 3,447 K (Sun: 5,772 K)
- Mass
- 0.34 M☉
- Radius
- 0.35 R☉
- Luminosity
- 0.0149 L☉
- Age
- 8.2 billion years (Sun: 4.6)
Planetary System
Gaia-5 b is the only planet known to orbit Gaia-5 so far.
Gaia-5 b — Complete Data
| Mass | 6,633.08 Earth masses (20.870 Jupiter masses) |
|---|---|
| Orbital period | 358.62 days |
| Eccentricity | 0.642 |
| Distance from Earth | 134.3 light-years (41.2 parsecs) |
| Constellation | Cygnus |
| Discovery method | Astrometry |
| Discovery facility | European Space Agency (ESA) Gaia Satellite |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-02-12. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Gaia-5 b
Is Gaia-5 b habitable?
Gaia-5 b is not known to orbit within the habitable zone of Gaia-5.
How far away is Gaia-5 b?
Gaia-5 b is about 134 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,363,680 years to get there.
How long is a year on Gaia-5 b?
One orbit around Gaia-5 takes 358.6 Earth days.
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