Gl 725 A b
Gl 725 A b is a super-Earth orbiting the M3 star Gl 725 A in the constellation Draco. It lies about 12 light-years from Earth and was discovered in 2025 using the radial velocity method.
Is Gl 725 A b in the Habitable Zone?
Gl 725 A b orbits inside the inner edge of the habitable zone of Gl 725 A. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Gl 725 A: 0.102–0.266 AU (conservative: 0.129–0.252 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Orbit and Year Length
A year on Gl 725 A b — one full orbit around Gl 725 A — lasts 11.2 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.068 AU — closer to its star than Mercury is to the Sun.
How Was Gl 725 A b Discovered?
Gl 725 A b was discovered in 2025 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 Gl 725 A b?
Gl 725 A b is 11.5 light-years (3.5 parsecs) from Earth. Light arriving here tonight left the planet around the year 2015. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 202,400 years to make the journey.
The Host Star: Gl 725 A
Gl 725 A b belongs to a system of 2 stars; it orbits Gl 725 A.
Gl 725 A
- Spectral type
- M3
- Surface temperature
- 3,433 K (Sun: 5,772 K)
- Mass
- 0.33 M☉
- Radius
- 0.35 R☉
- Luminosity
- 0.0155 L☉
- Age
- 6.2 billion years (Sun: 4.6)
Planetary System
Gl 725 A b is the only planet known to orbit Gl 725 A so far.
Gl 725 A b — Complete Data
| Mass (best estimate) | 2.78 Earth masses |
|---|---|
| Orbital period | 11.22 days |
| Orbital distance | 0.068 AU |
| Distance from Earth | 11.5 light-years (3.5 parsecs) |
| Constellation | Draco |
| Discovery method | Radial Velocity |
| Discovery facility | Multiple Observatories |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-02-24. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Gl 725 A b
Is Gl 725 A b habitable?
No — Gl 725 A b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is Gl 725 A b?
Gl 725 A b is about 12 light-years from Earth in the constellation Draco. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 202,400 years to get there.
How long is a year on Gl 725 A b?
One orbit around Gl 725 A takes 11.2 Earth days — short enough that 33 of its years would fit into one Earth year.
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