Confirmed exoplanet · Database record + computed analysis
LTT 9779 b
A confirmed world orbiting LTT 9779, 262.4 light-years away.
A Neptune-class world
4.72 Earth radii, in the ice-giant size range. At only 29.3 Earth masses for that size, it must be substantially gas or volatile ices: puffy, not rocky.
The orbit
Its year lasts about 19.0 hours, making it an ultra-short-period planet skimming its star.
Temperature and starlight
Its equilibrium temperature (the airless-world estimate) is about 1,705 °C. Hot enough to melt copper; any surface would glow. It receives 1,781.2 times the starlight Earth gets.
Its sun
Its star is Sun-like (5,443 K, G7 V; the Sun is 5,772 K).
How far is that, really?
At 262 light-years, tonight's light from this system left it around the year 1763. A Voyager-speed probe would need roughly 4,641,676 years to get there.
How we found it
It was found by the transit method: the planet crosses its star's face on schedule, dimming it by a tiny, repeating fraction. The dip's depth gives the planet's size. The discovery was announced in 2020 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.