- weight
- ≈ 0.90 g
- sun
- 13.7× wider
- sky
- amber-orange
Illustration computed from this world’s measured and derived values, not a photograph.
HD 101581 b
HD 101581 b is a confirmed rocky exoplanet 41.7 ly from Earth in the constellation Centaurus, discovered in 2025 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.
Standing on HD 101581 b, you would weigh roughly about 10% less than you do on Earth. Its orange dwarf looks 13.7× 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 4.5 days, and at an estimated 561°C (1042°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 about 0.90 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 561°C (1042°F), sound would travel roughly 70% 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 561°C (1042°F), with no liquid water and no shade anywhere.
- Surface gravity is close to Earth's, about 0.90 times, so you would move much as you do here.
- !Its star delivers about 80 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 101581 b’s measured and computed values, not a real advisory.
How long to get there · 41.7 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 HD 101581 b?
HD 101581 b's surface gravity is about 0.90 times Earth's, estimated from its size.
How much would you weigh on HD 101581 b?
Someone who weighs 150 pounds on Earth would weigh about 136 pounds on HD 101581 b.
How far is HD 101581 b from Earth?
HD 101581 b lies about 41.7 light-years from Earth.
How long would it take to get to HD 101581 b?
At the speed of NASA's Parker Solar Probe, the fastest craft ever built, the journey would take about 64,999 years.
How hot is HD 101581 b?
HD 101581 b's equilibrium temperature, the balance it reaches from its star's light alone before any greenhouse warming, is about 561°C (1042°F).
How long is a year on HD 101581 b?
HD 101581 b completes one orbit of its star in 4.5 days.
Illustration generated from HD 101581 b's confirmed parameters, not a photograph.