- sun
- 8.6× wider
- sky
- deep orange
Illustration computed from this world’s measured and derived values, not a photograph.
TOI-789 b
TOI-789 b is a confirmed rocky exoplanet 142 ly from Earth in the constellation Volans, discovered in 2026 by Transiting Exoplanet Survey Satellite (TESS).
Transit: spotted by the tiny, repeating dip in its star’s light each time the planet crosses in front of it (what that means).
Its red dwarf looks 8.6× wider than ours, bathing the surface in deep 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 5.4 days, and at an estimated 175°C (347°F) it is blistering.
Catalog values (NASA Exoplanet Archive): mass 3.70 M⊕, radius 1.18 R⊕. Its catalog mass and radius imply a density of 12.4 g/cm³, denser than compressed iron, so they cannot both be right, and gravityfinder does not use TOI-789 b in gravity rankings or weight calculations.
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
Hear how a voice sounds herea computed acoustic demoEXPERIMENTAL · just for fun
Your voice would sound noticeably higher and reedier.
Assuming Earth-like air at this world's temperature of about 175°C (347°F), sound would travel roughly 25% 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 175°C (347°F), well above anything you would call comfortable.
- !Likely tidally locked: one hemisphere in endless day, the other in permanent night.
A playful read of TOI-789 b’s measured and computed values, not a real advisory.
How long to get there · 142 ly awayCALCULATED
Zoom out: star → system → (soon) galaxy arm, host black hole, and a real image of the host galaxy.
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How far is TOI-789 b from Earth?
TOI-789 b lies about 142 light-years from Earth.
How long would it take to get to TOI-789 b?
At the speed of NASA's Parker Solar Probe, the fastest craft ever built, the journey would take about 220,801 years.
How hot is TOI-789 b?
TOI-789 b's equilibrium temperature, the balance it reaches from its star's light alone before any greenhouse warming, is about 175°C (347°F).
How long is a year on TOI-789 b?
TOI-789 b completes one orbit of its star in 5.4 days.
Illustration generated from TOI-789 b's confirmed parameters, not a photograph.