- weight
- ≥ 1.15 g
- sun
- 2.9× wider
- sky
- amber-orange
Illustration computed from this world’s measured and derived values, not a photograph.
HD 40307 f
HD 40307 f is a confirmed sub-Neptune exoplanet 42.2 ly from Earth in the constellation Pictor, discovered in 2013 by La Silla Observatory.
Radial Velocity: spotted by the gravitational wobble the planet tugs in its star.
Standing on HD 40307 f, you would weigh roughly about 15% more than you do on Earth. Its orange dwarf looks 2.9× 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 52 days, and at an estimated 125°C (257°F) it is warm.
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 noticeably higher and reedier.
Assuming Earth-like air at this world's temperature of about 125°C (257°F), sound would travel roughly 18% 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 125°C (257°F), well above anything you would call comfortable.
- Surface gravity is close to Earth's, at least 1.15 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 HD 40307 f’s measured and computed values, not a real advisory.
How long to get there · 42.2 ly away
Zoom out: star → system → (soon) galaxy arm, host black hole, and a real image of the host galaxy.
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What is the gravity on HD 40307 f?
HD 40307 f'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 40307 f?
Someone who weighs 150 pounds on Earth would weigh at least 172 pounds on HD 40307 f.
How far is HD 40307 f from Earth?
HD 40307 f lies about 42.2 light-years from Earth.
How long would it take to get to HD 40307 f?
At the speed of NASA's Parker Solar Probe, the fastest craft ever built, the journey would take about 65,804 years.
How hot is HD 40307 f?
HD 40307 f's equilibrium temperature, the balance it reaches from its star's light alone before any greenhouse warming, is about 125°C (257°F).
How long is a year on HD 40307 f?
HD 40307 f completes one orbit of its star in 52 days.
Illustration generated from HD 40307 f's confirmed parameters, not a photograph.