- weight
- ≥ 1.01 g
- sun
- 0.72× as wide
- sky
- deep orange
Illustration computed from this world’s measured and derived values, not a photograph.
GJ 3138 d
GJ 3138 d is a confirmed sub-Neptune exoplanet 92.9 ly from Earth in the constellation Cetus, discovered in 2017 by La Silla Observatory.
Radial Velocity: spotted by the gravitational wobble the planet tugs in its star.
Standing on GJ 3138 d, you would weigh roughly almost exactly what you weigh on Earth. Its orange dwarf looks 0.72× as wide as ours, bathing the surface in deep orange light. A year passes in just 258 days, and at an estimated -121°C (-187°F) it is deeply frozen.
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 1.0 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 deeper and fuller.
Assuming Earth-like air at this world's temperature of about -121°C (-187°F), sound would travel roughly 27% slower than on Earth, so your voice would sound deeper and fuller. 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.
- !Deeply frozen at around -121°C (-187°F), far below the freezing point of water.
- Surface gravity is close to Earth's, at least 1.01 times, so you would move much as you do here.
A playful read of GJ 3138 d’s measured and computed values, not a real advisory.
How long to get there · 92.9 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 3138 d?
GJ 3138 d's surface gravity is at least 1.0 times Earth's, and possibly more: its mass is only a lower bound.
How much would you weigh on GJ 3138 d?
Someone who weighs 150 pounds on Earth would weigh at least 151 pounds on GJ 3138 d.
How far is GJ 3138 d from Earth?
GJ 3138 d lies about 92.9 light-years from Earth.
How long would it take to get to GJ 3138 d?
At the speed of NASA's Parker Solar Probe, the fastest craft ever built, the journey would take about 144,826 years.
How hot is GJ 3138 d?
GJ 3138 d's equilibrium temperature, the balance it reaches from its star's light alone before any greenhouse warming, is about -121°C (-187°F).
How long is a year on GJ 3138 d?
GJ 3138 d completes one orbit of its star in 258 days.
Illustration generated from GJ 3138 d's confirmed parameters, not a photograph.