Confirmed exoplanet · Database record + computed analysis
TOI-172 b
A confirmed world orbiting TOI-172, 1,118.2 light-years away.
A gas giant
10.82 Earth radii, Jupiter-class (Jupiter is 11.2). With 1722.6 Earth masses packed into that size, its density points to rock and iron rather than gas. Orbiting this close, it is a classic 'hot Jupiter', a giant that migrated inward from where it formed.
The orbit
Its year, one full orbit, takes just 9.5 Earth days. The orbit is strongly stretched (eccentricity 0.38), so its distance from the star, and with it the climate, swings dramatically.
Temperature and starlight
Its equilibrium temperature (the airless-world estimate) is about 925 °C. Hot enough to melt copper; any surface would glow. It receives 299.0 times the starlight Earth gets.
Its sun
Its star is Sun-like (5,645 K; the Sun is 5,772 K).
How far is that, really?
At 1,118 light-years, tonight's light from this system left it around the year 907. A Voyager-speed probe would need roughly 19,783,240 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 2019 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.