HD 11343 c
HD 11343 c is a cold gas giant orbiting HIP 8541 in the constellation Eridanus. It lies about 506 light-years from Earth and was discovered in 2022 using the radial velocity method.
Is HD 11343 c in the Habitable Zone?
The position of HD 11343 c relative to the habitable zone of HIP 8541 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HD 11343 c — one full orbit around HIP 8541 — lasts 228.5 Earth days, between the years of Mercury (88 days) and Earth (365 days). It orbits at an average distance of 0.923 AU — comparable to the inner Solar System. Its orbit is mildly elliptical (eccentricity 0.17).
How Was HD 11343 c Discovered?
HD 11343 c was discovered in 2022 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 11343 c?
HD 11343 c is 505.9 light-years (155.1 parsecs) from Earth. Light arriving here tonight left the planet around the year 1521. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 8,903,840 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. HD 11343 c scores 0.11, ranking #4,394 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HIP 8541
HD 11343 c belongs to a system of 2 stars; it orbits HIP 8541.
HIP 8541
- Mass
- 2.01 M☉
The HIP 8541 Planetary System
HD 11343 c is one of 2 known planets in the HIP 8541 system. Its siblings:
- HIP 8541 b (Cold Gas Giant)
HD 11343 c — Complete Data
| Mass (best estimate) | 255.53 Earth masses |
|---|---|
| Orbital period | 228.54 days |
| Orbital distance | 0.923 AU |
| Eccentricity | 0.169 |
| Earth Similarity Index | 0.11 |
| Distance from Earth | 505.9 light-years (155.1 parsecs) |
| Constellation | Eridanus |
| Discovery method | Radial Velocity |
| Discovery facility | Multiple Observatories |
| Discovery year | 2022 |
Data: NASA Exoplanet Archive, last updated 2023-06-14. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 11343 c
Is HD 11343 c habitable?
HD 11343 c is not known to orbit within the habitable zone of HIP 8541, and as a cold gas giant it is an unlikely candidate for life as we know it.
How far away is HD 11343 c?
HD 11343 c is about 506 light-years from Earth in the constellation Eridanus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 8,903,840 years to get there.
How long is a year on HD 11343 c?
One orbit around HIP 8541 takes 228.5 Earth days.
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