:INFO
Mini-neptune around TOI-4336 A
It is 2.14 times Earth's radius, closest in size to Neptune, and 3.3 times Earth's mass, at 1.87 g/cm3, less dense than Earth. A year there lasts 16.34 days, on an orbit 5 times closer to its star than Mercury is to the Sun. Its equilibrium temperature is 309 K, in the range where liquid water is possible. The host star TOI-4336 A runs at 3307 K with 0.31 times the Sun's mass.

:CHECKLIST
The habitability checklist, honestly scored
[ ] Sits inside the computed habitable zone of its star. Yes.
[ ] Dense enough to be rock rather than gas, at 1.87 g/cm3. No.
[ ] A measured mass, not just a radius. Yes.
[ ] A measured temperature rather than one derived from the star. Yes.
[ ] Any detection of an atmosphere. Not recorded in the archive.

:STATS
[icon:TARGET] Radius | 2.14 Earth radii
[icon:CHART] Mass | 3.3 Earth masses
[icon:FIRE] Equilibrium temperature | 309 K (measured)
[icon:CLOCK] One year | 16.34 days
[icon:BOLT] Orbit radius | 0.0849 AU
[icon:STAR] Host star | TOI-4336 A at 3307 K
[icon:USERS] Distance | 74 light-years
[icon:TRENDING_DOWN] Starlight blocked | 0.360% at each transit

:TIMELINE
🔭🪐📅
2024-01-01 | TOI-4336 A b
2026-01-01 | TOI-4336 A c

:PATH
What you get from the shadow
The fraction of starlight blocked sets the radius against the star's.

:NOTE
Found by Transiting Exoplanet Survey Satellite (TESS) in 2024. 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
Two independent measurements sit behind this page: a dip in starlight for the size, and something else entirely for the mass. Together they make a density.

:NOTE
TOI-4336 A has 2 known planets. Planets in company tug on each other, and those tugs are measurable, which is how masses get pinned down without a wobble.

:THREAD

:LINK
https://exoplanetarchive.ipac.caltech.edu/overview/TOI-4336%20A%20b
Every parameter ever published for TOI-4336 A b, at the NASA Exoplanet Archive