- weight
- 0.80 g
- sun
- 6.2× wider
- sky
- bright white
Illustration computed from this world’s measured and derived values, not a photograph.
HIP 41378 c
HIP 41378 c is a confirmed sub-Neptune exoplanet 347 ly from Earth in the constellation Cancer, discovered in 2016 by K2.
Transit: spotted by the tiny, repeating dip in its star’s light each time the planet crosses in front of it.
Standing on HIP 41378 c, you would weigh about 20% less than you do on Earth. Its yellow-white star looks 6.2× 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 32 days, and at an estimated 484°C (903°F) it is furnace-hot.
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
If your children grew up herea playful thought experiment
Gravity close to Earth's, at 0.80 times. A child would grow up much as they would back home.
A playful thought experiment from this world’s gravity, not a prediction about any real person. No human has ever grown up off Earth, so no one truly knows; the direction (taller in low gravity, shorter and stockier in high) follows how growing bodies respond to weight.
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 484°C (903°F), sound would travel roughly 62% 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 484°C (903°F), with no liquid water and no shade anywhere.
- Surface gravity is close to Earth's, 0.80 times, so you would move much as you do here.
- !Its star delivers about 54 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 HIP 41378 c’s measured and computed values, not a real advisory.
How long to get there · 347 ly away
Zoom out: star → system → (soon) galaxy arm, host black hole, and a real image of the host galaxy.
Matched telescope & eyepiece recommendations are coming. Any product links will carry a clear affiliate disclosure.
What is the gravity on HIP 41378 c?
HIP 41378 c's surface gravity is about 0.80 times Earth's.
How much would you weigh on HIP 41378 c?
Someone who weighs 150 pounds on Earth would weigh about 119 pounds on HIP 41378 c.
How far is HIP 41378 c from Earth?
HIP 41378 c lies about 347 light-years from Earth.
How long would it take to get to HIP 41378 c?
At the speed of NASA's Parker Solar Probe, the fastest craft ever built, the journey would take about 540,666 years.
How hot is HIP 41378 c?
HIP 41378 c's equilibrium temperature, the balance it reaches from its star's light alone before any greenhouse warming, is about 484°C (903°F).
How long is a year on HIP 41378 c?
HIP 41378 c completes one orbit of its star in 32 days.
Illustration generated from HIP 41378 c's confirmed parameters, not a photograph.