HD 23079 c
HD 23079 c is a super-Earth orbiting the F9.5 V star HD 23079 in the constellation Reticulum. It lies about 109 light-years from Earth and was discovered in 2025 using the radial velocity method.
Is HD 23079 c in the Habitable Zone?
The position of HD 23079 c relative to the habitable zone of HD 23079 cannot be precisely determined from the available orbital data.
Habitable zone of HD 23079: 0.861–2.017 AU (conservative: 1.090–1.912 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Orbit and Year Length
A year on HD 23079 c — one full orbit around HD 23079 — lasts 5.75 Earth days, shorter than Mercury's 88-day year. Its orbit is mildly elliptical (eccentricity 0.10).
How Was HD 23079 c Discovered?
HD 23079 c was discovered in 2025 using the radial velocity method, with observations from La Silla 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 23079 c?
HD 23079 c is 109.1 light-years (33.5 parsecs) from Earth. Light arriving here tonight left the planet around the year 1917. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,920,160 years to make the journey.
The Host Star: HD 23079
HD 23079
- Spectral type
- F9.5 V
- Surface temperature
- 5,994 K (Sun: 5,772 K)
- Mass
- 1.16 M☉
- Radius
- 1.08 R☉
- Luminosity
- 1.3500 L☉
- Age
- 2.6 billion years (Sun: 4.6)
The HD 23079 Planetary System
HD 23079 c is one of 2 known planets in the HD 23079 system. Its siblings:
- HD 23079 b (Cold Gas Giant)
HD 23079 c — Complete Data
| Mass (best estimate) | 8.26 Earth masses |
|---|---|
| Orbital period | 5.75 days |
| Eccentricity | 0.097 |
| Distance from Earth | 109.1 light-years (33.5 parsecs) |
| Constellation | Reticulum |
| Discovery method | Radial Velocity |
| Discovery facility | La Silla Observatory |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-10-30. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 23079 c
Is HD 23079 c habitable?
HD 23079 c is not known to orbit within the habitable zone of HD 23079, and as a super-Earth it is an unlikely candidate for life as we know it.
How far away is HD 23079 c?
HD 23079 c is about 109 light-years from Earth in the constellation Reticulum. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,920,160 years to get there.
How long is a year on HD 23079 c?
One orbit around HD 23079 takes 5.7 Earth days — short enough that 64 of its years would fit into one Earth year.
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