HIP 41378 g
HIP 41378 g is a super-Earth orbiting HIP 41378 in the constellation Cancer. It lies about 347 light-years from Earth and was discovered in 2025 using the radial velocity method.
Is HIP 41378 g in the Habitable Zone?
The position of HIP 41378 g relative to the habitable zone of HIP 41378 cannot be precisely determined from the available orbital data.
Habitable zone of HIP 41378: 1.150–2.674 AU (conservative: 1.456–2.535 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 HIP 41378 g — one full orbit around HIP 41378 — lasts 64.1 Earth days, shorter than Mercury's 88-day year. Its orbit is nearly circular (eccentricity 0.010).
How Was HIP 41378 g Discovered?
HIP 41378 g was discovered in 2025 using the radial velocity method, with observations from W. M. Keck 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 41378 g?
HIP 41378 g is 346.7 light-years (106.3 parsecs) from Earth. Light arriving here tonight left the planet around the year 1680. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 6,101,920 years to make the journey.
The Host Star: HIP 41378
HIP 41378
- Surface temperature
- 6,371 K (Sun: 5,772 K)
- Mass
- 1.25 M☉
- Radius
- 1.31 R☉
- Age
- 1.8 billion years (Sun: 4.6)
The HIP 41378 Planetary System
HIP 41378 g is one of 6 known planets in the HIP 41378 system. Its siblings:
- HIP 41378 b (Super Earth)
- HIP 41378 c (Mini Neptune)
- HIP 41378 d (Puffy Planet)
- HIP 41378 e (Neptune-like)
- HIP 41378 f
HIP 41378 g — Complete Data
| Mass | 6.81 Earth masses (0.021 Jupiter masses) |
|---|---|
| Orbital period | 64.07 days |
| Eccentricity | 0.010 |
| Distance from Earth | 346.7 light-years (106.3 parsecs) |
| Constellation | Cancer |
| Discovery method | Radial Velocity |
| Discovery facility | W. M. Keck Observatory |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2026-05-07. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HIP 41378 g
Is HIP 41378 g habitable?
HIP 41378 g is not known to orbit within the habitable zone of HIP 41378, and as a super-Earth it is an unlikely candidate for life as we know it.
How far away is HIP 41378 g?
HIP 41378 g is about 347 light-years from Earth in the constellation Cancer. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 6,101,920 years to get there.
How long is a year on HIP 41378 g?
One orbit around HIP 41378 takes 64.1 Earth days.
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