:INFO
Terrestrial around Kepler-37
It is 0.31 times Earth's radius, closest in size to Mars, and 0.8 times Earth's mass, at 140.00 g/cm3, denser than Earth. A year there lasts 13.37 days, on an orbit 4 times closer to its star than Mercury is to the Sun. Its equilibrium temperature is 718 K, hot enough to melt lead. The host star Kepler-37 runs at 5357 K with 0.79 times the Sun's mass.

:COUNTER
140.0 g/cm3: denser than iron at Earth surface pressure

:JOURNEY
Kepler-37 from the inside out
1 0.102 AU
2 0.139 AU
3 0.211 AU

:STATS
[icon:TARGET] Radius | 0.31 Earth radii
[icon:CHART] Mass | 0.8 Earth masses
[icon:FIRE] Equilibrium temperature | 718 K (measured)
[icon:CLOCK] One year | 13.37 days
[icon:BOLT] Orbit radius | 0.1019 AU
[icon:STAR] Host star | Kepler-37 at 5357 K
[icon:USERS] Distance | 208 light-years
[icon:TRENDING_DOWN] Starlight blocked | 0.001% at each transit

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

:NOTE
Found by Kepler in 2013. Kepler watched a single field continuously, so it found the planets that come round often. A world with a long year simply never repeated within the mission.

:NOTE
Kepler-37 has 4 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
Size from the shadow, mass from elsewhere. Most transiting planets never get the second half, and without it composition stays a guess.

:LINK
https://exoplanetarchive.ipac.caltech.edu/overview/Kepler-37%20b
NASA Exoplanet Archive: every published measurement of this planet