GJ 832 b
GJ 832 b is a cold gas giant orbiting the M2/3 V star GJ 832 in the constellation Grus. It lies about 16 light-years from Earth and was discovered in 2008 using the radial velocity method.
Is GJ 832 b in the Habitable Zone?
The position of GJ 832 b relative to the habitable zone of GJ 832 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on GJ 832 b — one full orbit around GJ 832 — lasts 3,853.0 Earth days, longer than an Earth year. It orbits at an average distance of 3.700 AU. Its orbit is mildly elliptical (eccentricity 0.05).
How Was GJ 832 b Discovered?
GJ 832 b was discovered in 2008 using the radial velocity method, with observations from Anglo-Australian Telescope.
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 GJ 832 b?
GJ 832 b is 16.2 light-years (5.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 2010. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 285,120 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. GJ 832 b scores 0.07, ranking #5,002 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: GJ 832
GJ 832
- Spectral type
- M2/3 V
- Mass
- 0.45 M☉
- Age
- 8.1 billion years (Sun: 4.6)
Planetary System
GJ 832 b is the only planet known to orbit GJ 832 so far.
GJ 832 b — Complete Data
| Mass | 314.65 Earth masses (0.990 Jupiter masses) |
|---|---|
| Orbital period | 3,853.00 days |
| Orbital distance | 3.700 AU |
| Eccentricity | 0.050 |
| Earth Similarity Index | 0.07 |
| Distance from Earth | 16.2 light-years (5.0 parsecs) |
| Constellation | Grus |
| Discovery method | Radial Velocity |
| Discovery facility | Anglo-Australian Telescope |
| Discovery year | 2008 |
Data: NASA Exoplanet Archive, last updated 2023-09-05. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About GJ 832 b
Is GJ 832 b habitable?
GJ 832 b is not known to orbit within the habitable zone of GJ 832, and as a cold gas giant it is an unlikely candidate for life as we know it.
How far away is GJ 832 b?
GJ 832 b is about 16 light-years from Earth in the constellation Grus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 285,120 years to get there.
How long is a year on GJ 832 b?
One orbit around GJ 832 takes 3,853.0 Earth days.
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