gam Psc b
gam Psc b is a cold gas giant orbiting the G7 III star gam Psc in the constellation Pisces. It lies about 135 light-years from Earth and was discovered in 2021 using the radial velocity method.
Is gam Psc b in the Habitable Zone?
gam Psc b orbits inside the inner edge of the habitable zone of gam Psc. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of gam Psc: 6.056–14.799 AU (conservative: 7.670–14.031 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 gam Psc b — one full orbit around gam Psc — lasts 555.1 Earth days, longer than an Earth year. It orbits at an average distance of 1.320 AU. Its orbit is mildly elliptical (eccentricity 0.20).
How Was gam Psc b Discovered?
gam Psc b was discovered in 2021 using the radial velocity method, with observations from Okayama Astrophysical 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 gam Psc b?
gam Psc b is 134.7 light-years (41.3 parsecs) from Earth. Light arriving here tonight left the planet around the year 1892. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,370,720 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. gam Psc b scores 0.10, ranking #4,470 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: gam Psc
gam Psc
- Spectral type
- G7 III
- Surface temperature
- 4,742 K (Sun: 5,772 K)
- Mass
- 0.99 M☉
- Radius
- 11.20 R☉
- Luminosity
- 58.4104 L☉
Planetary System
gam Psc b is the only planet known to orbit gam Psc so far.
gam Psc b — Complete Data
| Mass (best estimate) | 425.89 Earth masses |
|---|---|
| Orbital period | 555.10 days |
| Orbital distance | 1.320 AU |
| Eccentricity | 0.204 |
| Earth Similarity Index | 0.10 |
| Distance from Earth | 134.7 light-years (41.3 parsecs) |
| Constellation | Pisces |
| Discovery method | Radial Velocity |
| Discovery facility | Okayama Astrophysical Observatory |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2022-01-10. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About gam Psc b
Is gam Psc b habitable?
No — gam Psc b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is gam Psc b?
gam Psc b is about 135 light-years from Earth in the constellation Pisces. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,370,720 years to get there.
How long is a year on gam Psc b?
One orbit around gam Psc takes 555.1 Earth days.
Explore gam Psc b in the app
Browse, filter and compare 6,000+ exoplanets on iPhone, iPad and Apple Watch — with habitable-zone views, widgets and offline data.
