- sun
- 6.3× wider
- sky
- bright white
Illustration computed from this world’s measured and derived values, not a photograph.
HD 50554 d
HD 50554 d is a confirmed rocky exoplanet 102 ly from Earth in the constellation Gemini, discovered in 2026 by Transiting Exoplanet Survey Satellite (TESS).
Transit: spotted by the tiny, repeating dip in its star’s light each time the planet crosses in front of it (what that means).
Its yellow-white star looks 6.3× wider than ours, bathing the surface in bright white light. It is likely tidally locked, so that sun never moves in the sky: one hemisphere in endless day, the other in permanent night. A year passes in just 28 days, and at an estimated 378°C (712°F) it is blistering.
Catalog values (NASA Exoplanet Archive): mass 10.40 M⊕, radius 1.41 R⊕. Its catalog mass and radius imply a density of 20.4 g/cm³, denser than compressed iron, so they cannot both be right, and gravityfinder does not use HD 50554 d in gravity rankings or weight calculations.
How closely this world matches Earth in size and warmth, from 0 to 1 (Earth = 1.0). Computed by gravityfinder. See every world ranked →
What these mean: surface gravity · tidal locking · equilibrium temperature · Earth similarity
Hear how a voice sounds herea computed acoustic demoEXPERIMENTAL · just for fun
Your voice would sound high and thin, almost cartoonish.
Assuming Earth-like air at this world's temperature of about 378°C (712°F), sound would travel roughly 50% faster than on Earth, so your voice would sound high and thin, almost cartoonish. The real atmosphere is unknown, so this is a best guess.
A real voice sample, pitch-shifted (tempo held constant) to suggest the acoustics: a playful approximation, not a precise simulation. Voice: Lingua Libre / Vealhurl, CC BY-SA 4.0.
- !Blistering at about 378°C (712°F), far too hot for liquid water on the surface.
- !Likely tidally locked: one hemisphere in endless day, the other in permanent night.
A playful read of HD 50554 d’s measured and computed values, not a real advisory.
How long to get there · 102 ly awayCALCULATED
Zoom out: star → system → (soon) galaxy arm, host black hole, and a real image of the host galaxy.
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How far is HD 50554 d from Earth?
HD 50554 d lies about 102 light-years from Earth.
How long would it take to get to HD 50554 d?
At the speed of NASA's Parker Solar Probe, the fastest craft ever built, the journey would take about 158,536 years.
How hot is HD 50554 d?
HD 50554 d's equilibrium temperature, the balance it reaches from its star's light alone before any greenhouse warming, is about 378°C (712°F).
How long is a year on HD 50554 d?
HD 50554 d completes one orbit of its star in 28 days.
Illustration generated from HD 50554 d's confirmed parameters, not a photograph.