:INFO
Terrestrial around Kepler-444
It is 0.40 times Earth's radius, closest in size to Mars. A year there lasts 3.60 days, on an orbit 9 times closer to its star than Mercury is to the Sun. Its equilibrium temperature is 944 K (derived from the star rather than measured), hot enough to melt lead. The host star Kepler-444 runs at 5046 K with 0.76 times the Sun's mass.

:JOURNEY
Kepler-444 from the inside out
1 0.042 AU
2 0.049 AU
3 0.060 AU
4 0.070 AU
5 0.081 AU

:STATS
[icon:TARGET] Radius | 0.40 Earth radii
[icon:FIRE] Equilibrium temperature | 944 K (derived)
[icon:CLOCK] One year | 3.60 days
[icon:BOLT] Orbit radius | 0.0418 AU
[icon:STAR] Host star | Kepler-444 at 5046 K
[icon:USERS] Distance | 119 light-years
[icon:TRENDING_DOWN] Starlight blocked | 0.002% at each transit

:PATH
What the dip tells you
Block a known fraction of a known star and you have measured a width.

:COUNTER
0.40x Earth: smaller than Venus

:CHECKLIST
What the archive holds on this planet
[ ] A radius from transit photometry. Yes.
[ ] A mass. No.
[ ] A density, so rock and gas can be told apart. No.
[ ] An orbital distance. Yes.
[ ] An observed temperature. No.
[ ] The shape of the orbit. Yes.

:NOTE
The archive lists no measured equilibrium temperature for this planet. The 944 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
Found by Kepler in 2015. 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.

: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-444 has 5 known planets. A crowded system is worth more than the sum of its planets: the timing of each transit constrains the others.

:THREAD

:LINK
https://exoplanetarchive.ipac.caltech.edu/overview/Kepler-444%20b
Every parameter ever published for Kepler-444 b, at the NASA Exoplanet Archive