What it’s like to stand here

HD 181433 c

sun: 0.42× as wide
sky: amber-orange

Illustration computed from this world’s measured and derived values, not a photograph.

HD 181433 c

HD 181433 c is a confirmed sub-Neptune exoplanet 87.7 ly from Earth in the constellation Pavo, discovered in 2008 by La Silla Observatory.

87.7 lyDiscovered in 2008 by La Silla Observatory

Radial Velocity: spotted by the gravitational wobble the planet tugs in its star.

HD 181433 →

host star

–

radius

2,207 M⊕

mass · measured

2.8 years

orbital period

-120°C (-183°F)

avg temp

Human scale

Its orange dwarf looks 0.42× as wide as ours, bathing the surface in amber-orange light. A year here lasts 2.8 Earth years, and at an estimated -120°C (-183°F) it is deeply frozen.

–

gravity, needs mass + radius

2.8 years

one year, in Earth time

0.42× as wide

how big its sun looks vs ours

amber-orange

midday sky tint

–

jump, needs gravity

normal

day/night cycle (not tidally locked)

What these mean: surface gravity · tidal locking · equilibrium temperature

Hear how a voice sounds herea computed acoustic demo

Your voice would sound deeper and fuller.

Assuming Earth-like air at this world's temperature of about -120°C (-183°F), sound would travel roughly 27% slower than on Earth, so your voice would sound deeper and fuller. The real atmosphere is unknown, so this is a best guess.

sound speed ≈ 248 m/s · 0.73× Earth · assumes Earth-like air

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.

The journey

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