Gl 725 B c
Gl 725 B c is a super-Earth orbiting Gl 725 B in the constellation Draco. It lies about 22 light-years from Earth and was discovered in 2026 using the radial velocity method. It orbits within the habitable zone of its star — the region where liquid water could exist on a planet's surface.
Is Gl 725 B c in the Habitable Zone?
Gl 725 B c orbits inside the conservative habitable zone of Gl 725 B — the region where a rocky planet could sustain liquid water on its surface. This makes it one of the most interesting known exoplanets in the search for life.
Habitable zone of Gl 725 B: 0.078–0.205 AU (conservative: 0.099–0.194 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on Gl 725 B c
The equilibrium temperature of Gl 725 B c is about 215 K (-58 °C) — well below freezing. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C.
Orbit and Year Length
A year on Gl 725 B c — one full orbit around Gl 725 B — lasts 37.9 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.139 AU — closer to its star than Mercury is to the Sun.
How Was Gl 725 B c Discovered?
Gl 725 B c was discovered in 2026 using the radial velocity method, with observations from Mauna Kea 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 Gl 725 B c?
Gl 725 B c is 22.3 light-years (6.8 parsecs) from Earth. Light arriving here tonight left the planet around the year 2004. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 392,480 years to make the journey.
The Host Star: Gl 725 B
Gl 725 B c belongs to a system of 2 stars; it orbits Gl 725 B.
Gl 725 B
- Surface temperature
- 3,379 K (Sun: 5,772 K)
- Mass
- 0.25 M☉
- Radius
- 0.28 R☉
- Luminosity
- 0.0092 L☉
- Age
- 8.7 billion years (Sun: 4.6)
Planetary System
Gl 725 B c is the only planet known to orbit Gl 725 B so far.
Gl 725 B c — Complete Data
| Mass (best estimate) | 3.40 Earth masses |
|---|---|
| Orbital period | 37.90 days |
| Orbital distance | 0.139 AU |
| Equilibrium temperature | 215 K (-58 °C) |
| Distance from Earth | 22.3 light-years (6.8 parsecs) |
| Constellation | Draco |
| Discovery method | Radial Velocity |
| Discovery facility | Mauna Kea Observatory |
| Discovery year | 2026 |
Data: NASA Exoplanet Archive, last updated 2026-08-20. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Gl 725 B c
Is Gl 725 B c habitable?
Gl 725 B c orbits within the habitable zone of Gl 725 B, the region where liquid water could exist on a planet's surface. It sits in the conservative habitable zone — the most promising region for habitability. Whether it is actually habitable depends on its atmosphere and composition, which remain unknown.
How far away is Gl 725 B c?
Gl 725 B c is about 22 light-years from Earth in the constellation Draco. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 392,480 years to get there.
How long is a year on Gl 725 B c?
One orbit around Gl 725 B takes 37.9 Earth days.
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