HD 50554 d
HD 50554 d 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 d?
HD 50554 d has a radius of 1.41 times that of Earth. Its mass is 10.4 times that of Earth.
Is HD 50554 d in the Habitable Zone?
The position of HD 50554 d 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 d — one full orbit around HD 50554 — lasts 28.1 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.183 AU — closer to its star than Mercury is to the Sun.
How Was HD 50554 d Discovered?
HD 50554 d 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 d?
HD 50554 d 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 d is one of 3 known planets in the HD 50554 system. Its siblings:
- HD 50554 b (Cold Gas Giant)
- HD 50554 c (Super Earth)
HD 50554 d — Complete Data
| Radius | 1.410 Earth radii (0.126 Jupiter radii) |
|---|---|
| Mass | 10.40 Earth masses (0.033 Jupiter masses) |
| Orbital period | 28.07 days |
| Orbital distance | 0.183 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 d
Is HD 50554 d habitable?
HD 50554 d 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 d?
HD 50554 d 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 d compared to Earth?
HD 50554 d has 1.41 times the radius of Earth and about 10.4 times its mass.
How long is a year on HD 50554 d?
One orbit around HD 50554 takes 28.1 Earth days — short enough that 13 of its years would fit into one Earth year.
Explore HD 50554 d in the app
Browse, filter and compare 6,000+ exoplanets on iPhone, iPad and Apple Watch — with habitable-zone views, widgets and offline data.
