HD 133131 A b
HD 133131 A b is a cold gas giant orbiting the G2 V star HD 133131 A in the constellation Libra. It lies about 168 light-years from Earth and was discovered in 2016 using the radial velocity method.
Is HD 133131 A b in the Habitable Zone?
The position of HD 133131 A b relative to the habitable zone of HD 133131 A cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HD 133131 A b — one full orbit around HD 133131 A — lasts 649.0 Earth days, longer than an Earth year. It orbits at an average distance of 1.440 AU. Its orbit is highly elliptical (eccentricity 0.33), swinging dramatically closer to and farther from its star.
How Was HD 133131 A b Discovered?
HD 133131 A b was discovered in 2016 using the radial velocity method, with observations from Las Campanas 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 133131 A b?
HD 133131 A b is 167.9 light-years (51.5 parsecs) from Earth. Light arriving here tonight left the planet around the year 1859. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,955,040 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 133131 A b scores 0.34, ranking #818 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 133131 A
HD 133131 A b belongs to a system of 2 stars; it orbits HD 133131 A.
HD 133131 A
- Spectral type
- G2 V
- Surface temperature
- 5,799 K (Sun: 5,772 K)
- Mass
- 0.95 M☉
- Age
- 9.7 billion years (Sun: 4.6)
The HD 133131 A Planetary System
HD 133131 A b is one of 2 known planets in the HD 133131 A system. Its siblings:
- HD 133131 A c (Cold Gas Giant)
HD 133131 A b — Complete Data
| Mass (best estimate) | 451.32 Earth masses |
|---|---|
| Orbital period | 649.00 days |
| Orbital distance | 1.440 AU |
| Eccentricity | 0.330 |
| Earth Similarity Index | 0.34 |
| Distance from Earth | 167.9 light-years (51.5 parsecs) |
| Constellation | Libra |
| Discovery method | Radial Velocity |
| Discovery facility | Las Campanas Observatory |
| Discovery year | 2016 |
Data: NASA Exoplanet Archive, last updated 2016-09-06. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 133131 A b
Is HD 133131 A b habitable?
HD 133131 A b is not known to orbit within the habitable zone of HD 133131 A, and as a cold gas giant it is an unlikely candidate for life as we know it.
How far away is HD 133131 A b?
HD 133131 A b is about 168 light-years from Earth in the constellation Libra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,955,040 years to get there.
How long is a year on HD 133131 A b?
One orbit around HD 133131 A takes 649.0 Earth days.
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