:INFO
Terrestrial around KOI-55
It is 0.87 times Earth's radius, closest in size to Venus, and 0.7 times Earth's mass. A year there lasts 8.2 hours, on an orbit 51 times closer to its star than Mercury is to the Sun. Its equilibrium temperature is 6321 K (derived from the star rather than measured), hotter than the surface of many stars. The host star KOI-55 runs at 27730 K with 0.50 times the Sun's mass.

:COUNTER
6321 K: hot enough to vaporise rock on the dayside

:STATS
[icon:TARGET] Radius | 0.87 Earth radii
[icon:CHART] Mass | 0.7 Earth masses
[icon:FIRE] Equilibrium temperature | 6321 K (derived)
[icon:CLOCK] One year | 8.2 hours
[icon:BOLT] Orbit radius | 0.0076 AU
[icon:STAR] Host star | KOI-55 at 27730 K
[icon:USERS] Distance | 4015 light-years

:CHECKLIST
The state of the record for this planet
[ ] A measured radius. Yes.
[ ] A weight, not just a width. Yes.
[ ] A density, which decides rock or gas. No.
[ ] A semi-major axis. Yes.
[ ] A measured temperature rather than a derived one. No.
[ ] An eccentricity, so we know if the orbit is a circle. No.

:NOTE
The archive lists no measured equilibrium temperature for this planet. The 6321 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
KOI-55 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.

:NOTE
Found by Kepler in 2011. 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.

:THREAD

:LINK
https://exoplanetarchive.ipac.caltech.edu/overview/KOI-55%20c
NASA Exoplanet Archive: source data, including the values not used here