HD 50554 c
HD 50554 c is a super-Earth orbiting the F8 V star HD 50554 in the constellation Gemini. It lies about 102 light-years from Earth and was discovered in 2026 using the transit method.
How Big Is HD 50554 c?
HD 50554 c has a radius of 1.31 times that of Earth. Its mass is 5.3 times that of Earth.
Is HD 50554 c in the Habitable Zone?
The position of HD 50554 c relative to the habitable zone of HD 50554 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HD 50554 c — one full orbit around HD 50554 — lasts 5.97 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.065 AU — closer to its star than Mercury is to the Sun.
How Was HD 50554 c Discovered?
HD 50554 c was discovered in 2026 using the transit method, with observations from Transiting Exoplanet Survey Satellite (TESS).
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 HD 50554 c?
HD 50554 c is 101.7 light-years (31.2 parsecs) from Earth. Light arriving here tonight left the planet around the year 1925. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,789,920 years to make the journey.
The Host Star: HD 50554
HD 50554
- Spectral type
- F8 V
- Surface temperature
- 6,050 K (Sun: 5,772 K)
- Mass
- 1.10 M☉
The HD 50554 Planetary System
HD 50554 c is one of 3 known planets in the HD 50554 system. Its siblings:
- HD 50554 b (Cold Gas Giant)
- HD 50554 d (Super Earth)
HD 50554 c — Complete Data
| Radius | 1.310 Earth radii (0.117 Jupiter radii) |
|---|---|
| Mass | 5.30 Earth masses (0.017 Jupiter masses) |
| Orbital period | 5.97 days |
| Orbital distance | 0.065 AU |
| Distance from Earth | 101.7 light-years (31.2 parsecs) |
| Constellation | Gemini |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2026 |
Data: NASA Exoplanet Archive, last updated 2026-09-03. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 50554 c
Is HD 50554 c habitable?
HD 50554 c is not known to orbit within the habitable zone of HD 50554, and as a super-Earth it is an unlikely candidate for life as we know it.
How far away is HD 50554 c?
HD 50554 c is about 102 light-years from Earth in the constellation Gemini. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,789,920 years to get there.
How big is HD 50554 c compared to Earth?
HD 50554 c has 1.31 times the radius of Earth and about 5.3 times its mass.
How long is a year on HD 50554 c?
One orbit around HD 50554 takes 6.0 Earth days — short enough that 61 of its years would fit into one Earth year.
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