HIP 41378 f
HIP 41378 f is a cold gas giant orbiting HIP 41378 in the constellation Cancer. It lies about 347 light-years from Earth and was discovered in 2016 using the transit method.
How Big Is HIP 41378 f?
HIP 41378 f has a radius of 9.47 times that of Earth, or 0.84 times the radius of Jupiter. Its mass is 25.0 times that of Earth, giving it a density of 0.16 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is HIP 41378 f in the Habitable Zone?
The position of HIP 41378 f relative to the habitable zone of HIP 41378 cannot be precisely determined from the available orbital data.
Habitable zone of HIP 41378: 1.121–2.611 AU (conservative: 1.420–2.475 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 f — one full orbit around HIP 41378 — lasts 542.1 Earth days, longer than an Earth year. Its orbit is mildly elliptical (eccentricity 0.05).
How Was HIP 41378 f Discovered?
HIP 41378 f was discovered in 2016 using the transit method, with observations from K2.
The transit method watches a star for the tiny, regular dip in brightness that occurs when a planet crosses in front of it. The depth and timing of these dips reveal the planet's size and orbital period.
How Far Away Is HIP 41378 f?
HIP 41378 f 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.
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. HIP 41378 f scores 0.38, ranking #581 of 5,566 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HIP 41378
HIP 41378
- Surface temperature
- 6,290 K (Sun: 5,772 K)
- Mass
- 1.22 M☉
- Radius
- 1.30 R☉
- Age
- 2.1 billion years (Sun: 4.6)
The HIP 41378 Planetary System
HIP 41378 f is one of 6 known planets in the HIP 41378 system. Its siblings:
- HIP 41378 b (Mini Neptune)
- HIP 41378 c (Mini Neptune)
- HIP 41378 d (Puffy Planet)
- HIP 41378 e (Neptune-like)
- HIP 41378 g (Super Earth)
HIP 41378 f — Complete Data
| Radius | 9.470 Earth radii (0.845 Jupiter radii) |
|---|---|
| Mass | 25.00 Earth masses (0.079 Jupiter masses) |
| Density | 0.16 g/cm³ (Earth: 5.51) |
| Orbital period | 542.08 days |
| Eccentricity | 0.052 |
| Earth Similarity Index | 0.38 |
| Distance from Earth | 346.7 light-years (106.3 parsecs) |
| Constellation | Cancer |
| Discovery method | Transit |
| Discovery facility | K2 |
| Discovery year | 2016 |
Data: NASA Exoplanet Archive, last updated 2026-07-16. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HIP 41378 f
Is HIP 41378 f habitable?
HIP 41378 f is not known to orbit within the habitable zone of HIP 41378, and as a cold gas giant it is an unlikely candidate for life as we know it.
How far away is HIP 41378 f?
HIP 41378 f 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 big is HIP 41378 f compared to Earth?
HIP 41378 f has 9.47 times the radius of Earth and about 25.0 times its mass.
How long is a year on HIP 41378 f?
One orbit around HIP 41378 takes 542.1 Earth days.
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