- sun
- 15.3× wider
- sky
- amber-orange
Illustration computed from this world’s measured and derived values, not a photograph.
HD 40307 b
HD 40307 b is a confirmed sub-Neptune exoplanet 42.2 ly from Earth in the constellation Pictor, discovered in 2009 by La Silla Observatory.
Radial Velocity: spotted by the gravitational wobble the planet tugs in its star.
Its orange dwarf looks 15.3× 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 4.3 days, and at an estimated 637°C (1178°F) it is furnace-hot.
What these mean: surface gravity · tidal locking · equilibrium temperature
Hear how a voice sounds herea computed acoustic demo
Your voice would sound high and thin, almost cartoonish.
Assuming Earth-like air at this world's temperature of about 637°C (1178°F), sound would travel roughly 78% 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 637°C (1178°F), with no liquid water and no shade anywhere.
- !Its star delivers about 105 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 40307 b’s measured and computed values, not a real advisory.
How long to get there · 42.2 ly away
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 40307 b from Earth?
HD 40307 b lies about 42.2 light-years from Earth.
How long would it take to get to HD 40307 b?
At the speed of NASA's Parker Solar Probe, the fastest craft ever built, the journey would take about 65,804 years.
How hot is HD 40307 b?
HD 40307 b's equilibrium temperature, the balance it reaches from its star's light alone before any greenhouse warming, is about 637°C (1178°F).
How long is a year on HD 40307 b?
HD 40307 b completes one orbit of its star in 4.3 days.
Illustration generated from HD 40307 b's confirmed parameters, not a photograph.