HD 107148 c
HD 107148 c is a Neptune-like planet orbiting HD 107148 in the constellation Virgo. It lies about 161 light-years from Earth and was discovered in 2021 using the radial velocity method.
Is HD 107148 c in the Habitable Zone?
The position of HD 107148 c relative to the habitable zone of HD 107148 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HD 107148 c — one full orbit around HD 107148 — lasts 18.3 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.141 AU — closer to its star than Mercury is to the Sun. Its orbit is highly elliptical (eccentricity 0.34), swinging dramatically closer to and farther from its star.
How Was HD 107148 c Discovered?
HD 107148 c was discovered in 2021 using the radial velocity method, with observations from Multiple Observatories.
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 107148 c?
HD 107148 c is 161.2 light-years (49.4 parsecs) from Earth. Light arriving here tonight left the planet around the year 1865. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,837,120 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 107148 c scores 0.17, ranking #4,077 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 107148
HD 107148 c belongs to a system of 2 stars; it orbits HD 107148.
HD 107148
- Surface temperature
- 5,797 K (Sun: 5,772 K)
- Mass
- 1.12 M☉
The HD 107148 Planetary System
HD 107148 c is one of 2 known planets in the HD 107148 system. Its siblings:
- HD 107148 b (Cold Gas Giant)
HD 107148 c — Complete Data
| Mass (best estimate) | 19.90 Earth masses |
|---|---|
| Orbital period | 18.33 days |
| Orbital distance | 0.141 AU |
| Eccentricity | 0.340 |
| Earth Similarity Index | 0.17 |
| Distance from Earth | 161.2 light-years (49.4 parsecs) |
| Constellation | Virgo |
| Discovery method | Radial Velocity |
| Discovery facility | Multiple Observatories |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2021-09-20. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 107148 c
Is HD 107148 c habitable?
HD 107148 c is not known to orbit within the habitable zone of HD 107148, and as a Neptune-like planet it is an unlikely candidate for life as we know it.
How far away is HD 107148 c?
HD 107148 c is about 161 light-years from Earth in the constellation Virgo. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,837,120 years to get there.
How long is a year on HD 107148 c?
One orbit around HD 107148 takes 18.3 Earth days — short enough that 20 of its years would fit into one Earth year.
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