Confirmed exoplanet · Database record + computed analysis
TOI-1408 c
A confirmed world orbiting TOI-1408, 454.9 light-years away.
A sub-Neptune
2.22 Earth radii, likely a rocky core under a thick gas or steam envelope rather than a walkable surface.
The orbit
Its year, one full orbit, takes just 2.2 Earth days.
Temperature and starlight
Its equilibrium temperature (the airless-world estimate) is about 1,591 °C. Hot enough to melt copper; any surface would glow. It receives 2,005.3 times the starlight Earth gets.
Its sun
Its star is hotter than the Sun (6,117 K, F8 V), burning brighter and faster. It shares the system with 1 other known planet.
How far is that, really?
At 455 light-years, tonight's light from this system left it around the year 1571. A Voyager-speed probe would need roughly 8,048,996 years to get there.
How we found it
It was found through transit timing variations: its gravity nudges a sibling planet's transits early and late, betraying its presence without ever being seen directly. The discovery was announced in 2024 from Transiting Exoplanet Survey Satellite (TESS).
Everything above is computed from the archive’s measured values for this planet. Where a quantity is missing, the statement is omitted rather than guessed.
About this record
The measured values come from the NASA Exoplanet Archive, and any missing value has not been determined yet; the Atlas never fills gaps with guesses. More standout worlds: Proxima b, TRAPPIST-1e, K2-18 b, 55 Cancri e, and the detection methods that found them all.