HD 73344 c
HD 73344 c is a cold gas giant orbiting the F6 V star HD 73344 in the constellation Cancer. It lies about 115 light-years from Earth and was discovered in 2025 using the radial velocity method.
Is HD 73344 c in the Habitable Zone?
HD 73344 c orbits inside the inner edge of the habitable zone of HD 73344. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HD 73344: 1.042–2.428 AU (conservative: 1.319–2.302 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
See the full interactive habitable-zone view in the Exoplanet Explorer app ›
Orbit and Year Length
A year on HD 73344 c — one full orbit around HD 73344 — lasts 65.9 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.339 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.12).
How Was HD 73344 c Discovered?
HD 73344 c was discovered in 2025 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 73344 c?
HD 73344 c is 115.0 light-years (35.3 parsecs) from Earth. Light arriving here tonight left the planet around the year 1911. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,024,000 years to make the journey.
The Host Star: HD 73344
HD 73344
- Spectral type
- F6 V
- Surface temperature
- 6,253 K (Sun: 5,772 K)
- Mass
- 1.20 M☉
- Radius
- 1.22 R☉
- Age
- 1.2 billion years (Sun: 4.6)
The HD 73344 Planetary System
HD 73344 c is one of 3 known planets in the HD 73344 system. Its siblings:
- HD 73344 b (Mini Neptune)
- HD 73344 d (Cold Gas Giant)
HD 73344 c — Complete Data
| Mass (best estimate) | 118.55 Earth masses |
|---|---|
| Orbital period | 65.94 days |
| Orbital distance | 0.339 AU |
| Eccentricity | 0.124 |
| Distance from Earth | 115.0 light-years (35.3 parsecs) |
| Constellation | Cancer |
| Discovery method | Radial Velocity |
| Discovery facility | Multiple Observatories |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-01-22. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 73344 c
Is HD 73344 c habitable?
No — HD 73344 c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HD 73344 c?
HD 73344 c is about 115 light-years from Earth in the constellation Cancer. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,024,000 years to get there.
How long is a year on HD 73344 c?
One orbit around HD 73344 takes 65.9 Earth days.
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