HIP 71135 b
HIP 71135 b is a Neptune-like planet orbiting the M1 star HIP 71135 in the constellation Lupus. It lies about 105 light-years from Earth and was discovered in 2019 using the radial velocity method.
Is HIP 71135 b in the Habitable Zone?
The position of HIP 71135 b relative to the habitable zone of HIP 71135 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HIP 71135 b — one full orbit around HIP 71135 — lasts 87.2 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.335 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.21).
How Was HIP 71135 b Discovered?
HIP 71135 b was discovered in 2019 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 HIP 71135 b?
HIP 71135 b is 105.4 light-years (32.3 parsecs) from Earth. Light arriving here tonight left the planet around the year 1921. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,855,040 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. HIP 71135 b scores 0.55, ranking #197 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HIP 71135
HIP 71135
- Spectral type
- M1
- Surface temperature
- 4,146 K (Sun: 5,772 K)
- Mass
- 0.66 M☉
Planetary System
HIP 71135 b is the only planet known to orbit HIP 71135 so far.
HIP 71135 b — Complete Data
| Mass (best estimate) | 18.80 Earth masses |
|---|---|
| Orbital period | 87.19 days |
| Orbital distance | 0.335 AU |
| Eccentricity | 0.210 |
| Earth Similarity Index | 0.55 |
| Distance from Earth | 105.4 light-years (32.3 parsecs) |
| Constellation | Lupus |
| Discovery method | Radial Velocity |
| Discovery facility | Las Campanas Observatory |
| Discovery year | 2019 |
Data: NASA Exoplanet Archive, last updated 2019-05-20. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HIP 71135 b
Is HIP 71135 b habitable?
HIP 71135 b is not known to orbit within the habitable zone of HIP 71135, and as a Neptune-like planet it is an unlikely candidate for life as we know it.
How far away is HIP 71135 b?
HIP 71135 b is about 105 light-years from Earth in the constellation Lupus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,855,040 years to get there.
How long is a year on HIP 71135 b?
One orbit around HIP 71135 takes 87.2 Earth days.
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