HIP 35173 b
HIP 35173 b is a Neptune-like planet orbiting the K2 V star HIP 35173 in the constellation Monoceros. It lies about 108 light-years from Earth and was discovered in 2019 using the radial velocity method.
Is HIP 35173 b in the Habitable Zone?
The position of HIP 35173 b relative to the habitable zone of HIP 35173 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HIP 35173 b — one full orbit around HIP 35173 — lasts 41.5 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.217 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.16).
How Was HIP 35173 b Discovered?
HIP 35173 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 35173 b?
HIP 35173 b is 108.1 light-years (33.2 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 1,902,560 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 35173 b scores 0.34, ranking #822 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HIP 35173
HIP 35173
- Spectral type
- K2 V
- Surface temperature
- 4,881 K (Sun: 5,772 K)
- Mass
- 0.79 M☉
Planetary System
HIP 35173 b is the only planet known to orbit HIP 35173 so far.
HIP 35173 b — Complete Data
| Mass (best estimate) | 12.70 Earth masses |
|---|---|
| Orbital period | 41.52 days |
| Orbital distance | 0.217 AU |
| Eccentricity | 0.160 |
| Earth Similarity Index | 0.34 |
| Distance from Earth | 108.1 light-years (33.2 parsecs) |
| Constellation | Monoceros |
| 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 35173 b
Is HIP 35173 b habitable?
HIP 35173 b is not known to orbit within the habitable zone of HIP 35173, and as a Neptune-like planet it is an unlikely candidate for life as we know it.
How far away is HIP 35173 b?
HIP 35173 b is about 108 light-years from Earth in the constellation Monoceros. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,902,560 years to get there.
How long is a year on HIP 35173 b?
One orbit around HIP 35173 takes 41.5 Earth days.
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