HIP 54373 b
HIP 54373 b is a super-Earth orbiting the K5 V star HIP 54373 in the constellation Crater. It lies about 61 light-years from Earth and was discovered in 2019 using the radial velocity method.
Is HIP 54373 b in the Habitable Zone?
The position of HIP 54373 b relative to the habitable zone of HIP 54373 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HIP 54373 b — one full orbit around HIP 54373 — lasts 7.76 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.063 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.20).
How Was HIP 54373 b Discovered?
HIP 54373 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 54373 b?
HIP 54373 b is 61.0 light-years (18.7 parsecs) from Earth. Light arriving here tonight left the planet around the year 1965. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,073,600 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 54373 b scores 0.29, ranking #1,782 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HIP 54373
HIP 54373
- Spectral type
- K5 V
- Surface temperature
- 4,021 K (Sun: 5,772 K)
- Mass
- 0.57 M☉
The HIP 54373 Planetary System
HIP 54373 b is one of 2 known planets in the HIP 54373 system. Its siblings:
- HIP 54373 c (Neptune-like)
HIP 54373 b — Complete Data
| Mass (best estimate) | 8.62 Earth masses |
|---|---|
| Orbital period | 7.76 days |
| Orbital distance | 0.063 AU |
| Eccentricity | 0.200 |
| Earth Similarity Index | 0.29 |
| Distance from Earth | 61.0 light-years (18.7 parsecs) |
| Constellation | Crater |
| 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 54373 b
Is HIP 54373 b habitable?
HIP 54373 b is not known to orbit within the habitable zone of HIP 54373, and as a super-Earth it is an unlikely candidate for life as we know it.
How far away is HIP 54373 b?
HIP 54373 b is about 61 light-years from Earth in the constellation Crater. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,073,600 years to get there.
How long is a year on HIP 54373 b?
One orbit around HIP 54373 takes 7.8 Earth days — short enough that 47 of its years would fit into one Earth year.
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