:INFO Gas giant around TOI-201 It is 0.93 times Jupiter's radius, closest in size to Jupiter, and 4990.0 times Earth's mass, at 24.00 g/cm3, denser than Earth. A year there lasts 7.9 years, on an orbit 11.3 times Mercury's distance from the Sun. Its equilibrium temperature is 155 K (derived from the star rather than measured), colder than anywhere on Earth. The host star TOI-201 runs at 6423 K with 1.32 times the Sun's mass. :COUNTER 24.0 g/cm3: denser than iron at Earth surface pressure :JOURNEY TOI-201 from the inside out 1 0.070 AU 2 0.303 AU 3 4.370 AU :STATS [icon:TARGET] Radius | 10.40 Earth radii [icon:CHART] Mass | 4990.0 Earth masses [icon:FIRE] Equilibrium temperature | 155 K (derived) [icon:CLOCK] One year | 7.9 years [icon:BOLT] Orbit radius | 4.3700 AU [icon:STAR] Host star | TOI-201 at 6423 K [icon:USERS] Distance | 371 light-years :TIMELINE 🔭🪐📅 2021-01-01 | TOI-201 b 2025-01-01 | TOI-201 c 2026-01-01 | TOI-201 d :CHECKLIST The habitability checklist, honestly scored [ ] Within the zone where liquid water could persist. No. [ ] Dense enough to be rock rather than gas, at 24.00 g/cm3. Yes. [ ] A measured mass, not just a radius. Yes. [ ] A measured temperature rather than one derived from the star. No. [ ] Any detection of an atmosphere. Not recorded in the archive. :NOTE The archive lists no measured equilibrium temperature for this planet. The 155 K quoted here is derived from the star's output and the orbital distance, assuming a third of the light is reflected. It is an estimate from two numbers, not an observation. :NOTE Found by Transiting Exoplanet Survey Satellite (TESS) in 2025. TESS scans most of the sky in 27-day stretches, so it favours bright nearby stars and short orbits over the faint distant ones Kepler specialised in. :NOTE.half TOI-201 has 3 known planets. A crowded system is worth more than the sum of its planets: the timing of each transit constrains the others. :NOTE.half Its orbit is noticeably elliptical, eccentricity 0.65, so the starlight it receives changes substantially over one year. :THREAD :LINK https://exoplanetarchive.ipac.caltech.edu/overview/TOI-201%20c NASA Exoplanet Archive: source data, including the values not used here