HD 141937 b
HD 141937 b is a cold gas giant orbiting the G1 V star HD 141937 in the constellation Libra. It lies about 109 light-years from Earth and was discovered in 2002 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 HD 141937 b in the Habitable Zone?
HD 141937 b orbits inside the conservative habitable zone of HD 141937 — 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 HD 141937: 0.793–1.865 AU (conservative: 1.005–1.768 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 141937 b — one full orbit around HD 141937 — lasts 662.4 Earth days, longer than an Earth year. It orbits at an average distance of 1.540 AU. Its orbit is highly elliptical (eccentricity 0.46), swinging dramatically closer to and farther from its star.
How Was HD 141937 b Discovered?
HD 141937 b was discovered in 2002 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 141937 b?
HD 141937 b is 108.8 light-years (33.4 parsecs) from Earth. Light arriving here tonight left the planet around the year 1918. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,914,880 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 141937 b scores 0.36, ranking #725 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 141937
HD 141937
- Spectral type
- G1 V
- Surface temperature
- 5,870 K (Sun: 5,772 K)
- Mass
- 1.09 M☉
- Radius
- 1.03 R☉
Planetary System
HD 141937 b is the only planet known to orbit HD 141937 so far.
HD 141937 b — Complete Data
| Mass | 3,591.46 Earth masses (11.300 Jupiter masses) |
|---|---|
| Orbital period | 662.37 days |
| Orbital distance | 1.540 AU |
| Eccentricity | 0.460 |
| Earth Similarity Index | 0.36 |
| Distance from Earth | 108.8 light-years (33.4 parsecs) |
| Constellation | Libra |
| Discovery method | Radial Velocity |
| Discovery facility | La Silla Observatory |
| Discovery year | 2002 |
Data: NASA Exoplanet Archive, last updated 2026-06-04. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 141937 b
Is HD 141937 b habitable?
HD 141937 b orbits within the habitable zone of HD 141937, 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 HD 141937 b?
HD 141937 b is about 109 light-years from Earth in the constellation Libra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,914,880 years to get there.
How long is a year on HD 141937 b?
One orbit around HD 141937 takes 662.4 Earth days.
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