:INFO
Super-earth around Kepler-406
It is 1.43 times Earth's radius, closest in size to Earth, and 6.3 times Earth's mass, at 11.82 g/cm3, denser than Earth. A year there lasts 2.43 days. The host star Kepler-406 runs at 5538 K with 1.07 times the Sun's mass.

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

:STATS
[icon:TARGET] Radius | 1.43 Earth radii
[icon:CHART] Mass | 6.3 Earth masses
[icon:CLOCK] One year | 2.43 days
[icon:STAR] Host star | Kepler-406 at 5538 K
[icon:USERS] Distance | 1187 light-years
[icon:TRENDING_DOWN] Starlight blocked | 0.015% at each transit

:CHECKLIST
Known and unknown, as the archive has it
[ ] A size. Yes.
[ ] A mass. Yes.
[ ] A density, so rock and gas can be told apart. Yes.
[ ] A semi-major axis. No.
[ ] An observed temperature. No.
[ ] An eccentricity, so we know if the orbit is a circle. No.

:PATH
What the transit gives
How deep the star dims fixes the planet's size relative to it.

:NOTE
A transit gives the radius and a separate measurement gives the mass. Having both is what makes a density, and a density is the only clue to composition at this range.

:NOTE
Found by Kepler in 2014. Kepler stared at one patch of sky for four years, which is why so many of its planets have short periods: a planet only counts once you have seen it cross several times.

:NOTE
Kepler-406 has 2 known planets. Systems like this are the ones where architecture can be studied instead of guessed at.

:LINK
https://exoplanetarchive.ipac.caltech.edu/overview/Kepler-406%20b
NASA Exoplanet Archive: every published measurement of this planet