:INFO Mini-neptune around Kepler-150 It is 3.64 times Earth's radius, closest in size to Neptune. A year there lasts 637.21 days, on an orbit 3.2 times Mercury's distance from the Sun. Its equilibrium temperature is 208 K (derived from the star rather than measured), in the range where liquid water is possible. The host star Kepler-150 runs at 5528 K with 0.97 times the Sun's mass. :CHECKLIST Where this planet stands on each testable criterion [ ] Orbits within the zone where liquid water could persist. Yes. [ ] A measured mass, not just a radius. No. [ ] A measured temperature rather than one derived from the star. No. [ ] Any detection of an atmosphere. Not recorded in the archive. :JOURNEY Kepler-150 from the inside out 1 0.044 AU 2 0.073 AU 3 0.104 AU 4 0.189 AU 5 1.240 AU :STATS [icon:TARGET] Radius | 3.64 Earth radii [icon:FIRE] Equilibrium temperature | 208 K (derived) [icon:CLOCK] One year | 637.21 days [icon:BOLT] Orbit radius | 1.2400 AU [icon:STAR] Host star | Kepler-150 at 5528 K [icon:USERS] Distance | 2906 light-years [icon:TRENDING_DOWN] Starlight blocked | 0.136% at each transit :PATH What the dip tells you How deep the star dims fixes the planet's size relative to it. :TIMELINE 🔭🪐📅 2014-01-01 | Kepler-150 b, Kepler-150 c, Kepler-150 d, Kepler-150 e 2017-01-01 | Kepler-150 f :NOTE The archive lists no measured equilibrium temperature for this planet. The 208 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.half Everything known here comes from how much light went missing. That fixes the size and leaves the mass entirely open. :NOTE.half Kepler-150 has 5 known planets. Systems like this are the ones where architecture can be studied instead of guessed at. :NOTE Found by Kepler in 2017. Kepler's method needed repetition, not brightness. It could find small planets around faint stars, provided they came round quickly enough to be seen twice. :THREAD :LINK https://exoplanetarchive.ipac.caltech.edu/overview/Kepler-150%20f NASA Exoplanet Archive: source data, including the values not used here