- weight
- 0.77 g
- sun
- 10.9× wider
- sky
- amber-orange
Illustration computed from this world’s measured and derived values, not a photograph.
GJ 9827 d
GJ 9827 d is a confirmed sub-Neptune exoplanet 96.7 ly from Earth in the constellation Pisces, discovered in 2017 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 GJ 9827 d, you would weigh about 23% less than you do on Earth. Its orange dwarf looks 10.9× 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 6.2 days, and at an estimated 402°C (755°F) it is blistering.
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
Lighter than home, at 0.77 times Earth's gravity. A child raised here would likely grow taller and more slender than their Earth-raised parents, about 1.1x taller than on Earth: a 5 ft 10 in adult could stand nearer 6 ft 2 in.
- Bones
- Light and slender
- With little weight to carry, the growing skeleton lays down far less bone, the way astronauts' bones thin in months of low gravity.
- Movement
- Bounding and springy
- So little weight means each step would carry the body up and forward in long, floating strides.
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 402°C (755°F), sound would travel roughly 53% 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.
- !Blistering at about 402°C (755°F), far too hot for liquid water on the surface.
- Surface gravity is close to Earth's, 0.77 times, so you would move much as you do here.
- !Likely tidally locked: one hemisphere in endless day, the other in permanent night.
A playful read of GJ 9827 d’s measured and computed values, not a real advisory.
How long to get there · 96.7 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 GJ 9827 d?
GJ 9827 d's surface gravity is about 0.77 times Earth's.
How much would you weigh on GJ 9827 d?
Someone who weighs 150 pounds on Earth would weigh about 116 pounds on GJ 9827 d.
How far is GJ 9827 d from Earth?
GJ 9827 d lies about 96.7 light-years from Earth.
How long would it take to get to GJ 9827 d?
At the speed of NASA's Parker Solar Probe, the fastest craft ever built, the journey would take about 150,878 years.
How hot is GJ 9827 d?
GJ 9827 d's equilibrium temperature, the balance it reaches from its star's light alone before any greenhouse warming, is about 402°C (755°F).
How long is a year on GJ 9827 d?
GJ 9827 d completes one orbit of its star in 6.2 days.
Illustration generated from GJ 9827 d's confirmed parameters, not a photograph.