- sun
- 10.0× wider
- sky
- amber-orange
Illustration computed from this world’s measured and derived values, not a photograph.
HD 21749 c
HD 21749 c is a confirmed rocky exoplanet 53.2 ly from Earth in the constellation Reticulum, discovered in 2019 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 orange dwarf looks 10.0× wider than ours, bathing the surface in amber-orange 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 7.8 days, and at an estimated 428°C (802°F) it is furnace-hot.
Catalog values (NASA Exoplanet Archive): mass 3.70 M⊕, radius 0.89 R⊕. Its catalog mass and radius imply a density of 28.7 g/cm³, denser than compressed iron, so they cannot both be right, and gravityfinder does not use HD 21749 c 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 428°C (802°F), sound would travel roughly 56% 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.
- !Furnace-hot at around 428°C (802°F), with no liquid water and no shade anywhere.
- !Its star delivers about 306 times the sunlight Earth gets, a blinding, sterilizing glare.
- !Likely tidally locked: one hemisphere in endless day, the other in permanent night.
A playful read of HD 21749 c’s measured and computed values, not a real advisory.
How long to get there · 53.2 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 21749 c from Earth?
HD 21749 c lies about 53.2 light-years from Earth.
How long would it take to get to HD 21749 c?
At the speed of NASA's Parker Solar Probe, the fastest craft ever built, the journey would take about 83,016 years.
How hot is HD 21749 c?
HD 21749 c's equilibrium temperature, the balance it reaches from its star's light alone before any greenhouse warming, is about 428°C (802°F).
How long is a year on HD 21749 c?
HD 21749 c completes one orbit of its star in 7.8 days.
Illustration generated from HD 21749 c's confirmed parameters, not a photograph.