HD 85426 c
HD 85426 c is a Neptune-like planet orbiting TOI-1774 in the constellation Leo Minor. It lies about 176 light-years from Earth and was discovered in 2026 using the radial velocity method.
Is HD 85426 c in the Habitable Zone?
The position of HD 85426 c relative to the habitable zone of TOI-1774 cannot be precisely determined from the available orbital data.
Habitable zone of TOI-1774: 0.840–1.982 AU (conservative: 1.065–1.879 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on HD 85426 c
The equilibrium temperature of HD 85426 c is about 640 K (367 °C) — hot enough to melt many metals. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C.
Orbit and Year Length
A year on HD 85426 c — one full orbit around TOI-1774 — lasts 35.7 Earth days, shorter than Mercury's 88-day year. Its orbit is mildly elliptical (eccentricity 0.06).
How Was HD 85426 c Discovered?
HD 85426 c was discovered in 2026 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 85426 c?
HD 85426 c is 176.0 light-years (54.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 1850. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 3,097,600 years to make the journey.
The Host Star: TOI-1774
TOI-1774
- Surface temperature
- 5,746 K (Sun: 5,772 K)
- Mass
- 0.99 M☉
- Radius
- 1.13 R☉
- Age
- 7.4 billion years (Sun: 4.6)
The TOI-1774 Planetary System
HD 85426 c is one of 2 known planets in the TOI-1774 system. Its siblings:
- TOI-1774.01 (Mini Neptune)
HD 85426 c — Complete Data
| Mass (best estimate) | 10.30 Earth masses |
|---|---|
| Orbital period | 35.73 days |
| Eccentricity | 0.060 |
| Equilibrium temperature | 640 K (367 °C) |
| Distance from Earth | 176.0 light-years (54.0 parsecs) |
| Constellation | Leo Minor |
| Discovery method | Radial Velocity |
| Discovery facility | Multiple Observatories |
| Discovery year | 2026 |
Data: NASA Exoplanet Archive, last updated 2026-02-12. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 85426 c
Is HD 85426 c habitable?
HD 85426 c is not known to orbit within the habitable zone of TOI-1774, and as a Neptune-like planet it is an unlikely candidate for life as we know it.
How far away is HD 85426 c?
HD 85426 c is about 176 light-years from Earth in the constellation Leo Minor. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 3,097,600 years to get there.
How long is a year on HD 85426 c?
One orbit around TOI-1774 takes 35.7 Earth days — short enough that 10 of its years would fit into one Earth year.
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