Gaia-1 b
Gaia-1 b is a hot Jupiter orbiting Gaia-1 in the constellation Orion. It lies about 1,186 light-years from Earth and was discovered in 2022 using the transit method.
How Big Is Gaia-1 b?
Gaia-1 b has a radius of 13.78 times that of Earth, or 1.23 times the radius of Jupiter. Its mass is 534 times that of Earth.
Is Gaia-1 b in the Habitable Zone?
Gaia-1 b orbits inside the inner edge of the habitable zone of Gaia-1. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Gaia-1: 0.652–1.550 AU (conservative: 0.826–1.469 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-1 b — one full orbit around Gaia-1 — lasts 3.05 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.040 AU — closer to its star than Mercury is to the Sun.
How Was Gaia-1 b Discovered?
Gaia-1 b was discovered in 2022 using the transit method, with observations from European Space Agency (ESA) Gaia Satellite.
The transit method watches a star for the tiny, regular dip in brightness that occurs when a planet crosses in front of it. The depth and timing of these dips reveal the planet's size and orbital period.
How Far Away Is Gaia-1 b?
Gaia-1 b is 1,186.1 light-years (363.7 parsecs) from Earth. Light arriving here tonight left the planet about 1,186 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 20,875,360 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. Gaia-1 b scores 0.07, ranking #4,982 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Gaia-1
Gaia-1
- Surface temperature
- 5,470 K (Sun: 5,772 K)
- Mass
- 0.95 M☉
- Radius
- 0.95 R☉
Planetary System
Gaia-1 b is the only planet known to orbit Gaia-1 so far.
Gaia-1 b — Complete Data
| Radius | 13.776 Earth radii (1.229 Jupiter radii) |
|---|---|
| Mass | 533.95 Earth masses (1.680 Jupiter masses) |
| Orbital period | 3.05 days |
| Orbital distance | 0.040 AU |
| Earth Similarity Index | 0.07 |
| Distance from Earth | 1,186.1 light-years (363.7 parsecs) |
| Constellation | Orion |
| Discovery method | Transit |
| Discovery facility | European Space Agency (ESA) Gaia Satellite |
| Discovery year | 2022 |
Data: NASA Exoplanet Archive, last updated 2022-06-08. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Gaia-1 b
Is Gaia-1 b habitable?
No — Gaia-1 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is Gaia-1 b?
Gaia-1 b is about 1,186 light-years from Earth in the constellation Orion. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 20,875,360 years to get there.
How big is Gaia-1 b compared to Earth?
Gaia-1 b has 13.78 times the radius of Earth and about 534 times its mass.
How long is a year on Gaia-1 b?
One orbit around Gaia-1 takes 3.1 Earth days — short enough that 120 of its years would fit into one Earth year.
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