- weight
- ≥ 1.03 g
- sun
- 6.5× wider
- sky
- warm white
Illustration computed from this world’s measured and derived values, not a photograph.
HD 86728 b
HD 86728 b is a confirmed sub-Neptune exoplanet 48.7 ly from Earth in the constellation Leo Minor, discovered in 2025 by Multiple Observatories.
Radial Velocity: spotted by the gravitational wobble the planet tugs in its star.
Standing on HD 86728 b, you would weigh roughly almost exactly what you weigh on Earth. Its yellow, Sun-like star looks 6.5× 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 31 days, and at an estimated 414°C (778°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
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 high and thin, almost cartoonish.
Assuming Earth-like air at this world's temperature of about 414°C (778°F), sound would travel roughly 54% 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 414°C (778°F), far too hot for liquid water on the surface.
- Surface gravity is close to Earth's, at least 1.03 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 86728 b’s measured and computed values, not a real advisory.
How long to get there · 48.7 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 HD 86728 b?
HD 86728 b'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 HD 86728 b?
Someone who weighs 150 pounds on Earth would weigh at least 154 pounds on HD 86728 b.
How far is HD 86728 b from Earth?
HD 86728 b lies about 48.7 light-years from Earth.
How long would it take to get to HD 86728 b?
At the speed of NASA's Parker Solar Probe, the fastest craft ever built, the journey would take about 75,895 years.
How hot is HD 86728 b?
HD 86728 b's equilibrium temperature, the balance it reaches from its star's light alone before any greenhouse warming, is about 414°C (778°F).
How long is a year on HD 86728 b?
HD 86728 b completes one orbit of its star in 31 days.
Illustration generated from HD 86728 b's confirmed parameters, not a photograph.