- weight
- 4.17 g
- sun
- 2.8× wider
- sky
- warm white
Illustration computed from this world’s measured and derived values, not a photograph.
Kepler-409 b
Kepler-409 b is a confirmed rocky exoplanet 222 ly from Earth in the constellation Cygnus, discovered in 2014 by Kepler.
Transit: spotted by the tiny, repeating dip in its star’s light each time the planet crosses in front of it.
Standing on Kepler-409 b, you would weigh about 317% more than you do on Earth. Its yellow, Sun-like star looks 2.8× wider than ours, bathing the surface in warm white light. A year passes in just 69 days, and at an estimated 165°C (329°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
Beyond about four times Earth's gravity, a growing child's skeleton could not carry its own weight. A human body simply could not develop here, even sheltered indoors. The shape below is only where the trend points before biology gives out: short, and impossibly dense.
- Bones
- Thick and dense
- More weight to bear forces the skeleton to grow denser and stronger all through childhood.
- Heart
- Large and powerful
- Pushing blood upward against stronger gravity demands a bigger, harder-working heart.
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 noticeably higher and reedier.
Assuming Earth-like air at this world's temperature of about 165°C (329°F), sound would travel roughly 23% faster than on Earth, so your voice would sound noticeably higher and reedier. 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.
- !Persistently hot at around 165°C (329°F), well above anything you would call comfortable.
- !Gravity is 4.2 times Earth's, near the limit at which a person can stand or walk at all.
A playful read of Kepler-409 b’s measured and computed values, not a real advisory.
How long to get there · 222 ly away
No other confirmed planets here yet. New ones auto-appear as telescopes report.
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 Kepler-409 b?
Kepler-409 b's surface gravity is about 4.2 times Earth's.
How much would you weigh on Kepler-409 b?
Someone who weighs 150 pounds on Earth would weigh about 626 pounds on Kepler-409 b.
How far is Kepler-409 b from Earth?
Kepler-409 b lies about 222 light-years from Earth.
How long would it take to get to Kepler-409 b?
At the speed of NASA's Parker Solar Probe, the fastest craft ever built, the journey would take about 346,780 years.
How hot is Kepler-409 b?
Kepler-409 b's equilibrium temperature, the balance it reaches from its star's light alone before any greenhouse warming, is about 165°C (329°F).
How long is a year on Kepler-409 b?
Kepler-409 b completes one orbit of its star in 69 days.
Illustration generated from Kepler-409 b's confirmed parameters, not a photograph.