:INFO
Terrestrial around Kepler-158
It is 0.43 times Earth's radius, closest in size to Mars. A year there lasts 15.5 hours. The host star Kepler-158 runs at 4896 K with 0.66 times the Sun's mass.

:STATS
[icon:TARGET] Radius | 0.43 Earth radii
[icon:CLOCK] One year | 15.5 hours
[icon:STAR] Host star | Kepler-158 at 4896 K
[icon:USERS] Distance | 1028 light-years
[icon:TRENDING_DOWN] Starlight blocked | 0.003% at each transit

:PATH
What a crossing measures
The depth of the dip is the ratio of the two discs, so the radius follows.

:COUNTER
15.5 hours: one full year, start to finish

:TIMELINE
🔭🪐📅
2014-01-01 | Kepler-158 b, Kepler-158 c
2024-01-01 | Kepler-158 d

:CHECKLIST
What the archive holds on this planet
[ ] A measured radius. Yes.
[ ] A measured mass. No.
[ ] A density, so rock and gas can be told apart. No.
[ ] A semi-major axis. No.
[ ] A temperature someone observed rather than calculated. No.
[ ] The shape of the orbit. No.

:NOTE
Found by Kepler in 2024. The mission traded sky coverage for depth, holding one view for years. That bias runs through its whole catalogue and through this planet's discovery.

:NOTE
Kepler-158 has 3 known planets. Planets in company tug on each other, and those tugs are measurable, which is how masses get pinned down without a wobble.

:NOTE
Everything known here comes from how much light went missing. That fixes the size and leaves the mass entirely open.

:LINK
https://exoplanetarchive.ipac.caltech.edu/overview/Kepler-158%20d
Every parameter ever published for Kepler-158 d, at the NASA Exoplanet Archive