- weight
- ≥ 1.07 g
- sun
- 33.2× wider
- sky
- warm white
Illustration computed from this world’s measured and derived values, not a photograph.
HD 217786 c
HD 217786 c is a confirmed sub-Neptune exoplanet 181 ly from Earth in the constellation Pisces, discovered in 2022 by Multiple Observatories.
Radial Velocity: spotted by the gravitational wobble the planet tugs in its star.
Standing on HD 217786 c, you would weigh roughly about 7% more than you do on Earth. Its yellow, Sun-like star looks 33.2× wider than ours, bathing the surface in warm 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 2.5 days, and at an estimated 1390°C (2534°F) it is hot enough to melt rock.
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 1.1 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 1390°C (2534°F), sound would travel roughly 140% 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.
- !At about 1390°C (2534°F), the daytime side glows: metals run liquid and any atmosphere is being torn away.
- Surface gravity is close to Earth's, at least 1.07 times, so you would move much as you do here.
- !Its star delivers about 1,309 times the sunlight Earth gets, a blinding, sterilizing glare.
- !Earth-similarity index 0.12: this world has almost nothing in common with our own.
- !Likely tidally locked: one hemisphere in endless day, the other in permanent night.
A playful read of HD 217786 c’s measured and computed values, not a real advisory.
How long to get there · 181 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 217786 c?
HD 217786 c's surface gravity is at least 1.1 times Earth's, and possibly more: its mass is only a lower bound.
How much would you weigh on HD 217786 c?
Someone who weighs 150 pounds on Earth would weigh at least 161 pounds on HD 217786 c.
How far is HD 217786 c from Earth?
HD 217786 c lies about 181 light-years from Earth.
How long would it take to get to HD 217786 c?
At the speed of NASA's Parker Solar Probe, the fastest craft ever built, the journey would take about 282,237 years.
How hot is HD 217786 c?
HD 217786 c's equilibrium temperature, the balance it reaches from its star's light alone before any greenhouse warming, is about 1390°C (2534°F).
How long is a year on HD 217786 c?
HD 217786 c completes one orbit of its star in 2.5 days.
Illustration generated from HD 217786 c's confirmed parameters, not a photograph.