KOI-351 b: 8-Planet System, 0.074 AU Out
Super-earth around KOI-351
It is 1.31 times Earth's radius, closest in size to Earth. A year there lasts 7.01 days, on an orbit 5 times closer to its star than Mercury is to the Sun. Its equilibrium temperature is 1080 K (derived from the star rather than measured), hot enough to melt lead. The host star KOI-351 runs at 6080 K with 1.20 times the Sun's mass.
KOI-351 from the inside out
Orbit
/
Planet
Radius
1.31 Earth radii
Equilibrium temperature
1080 K (derived)
One year
7.01 days
Orbit radius
0.0740 AU
Host star
KOI-351 at 6080 K
Distance
2767 light-years
Starlight blocked
0.010% at each transit
What you get from the shadow
How deep the star dims fixes the planet's size relative to it.
The state of the record for this planet
A radius from transit photometry. Yes.
A measured mass. No.
A density, the one clue to composition. No.
A semi-major axis. Yes.
A measured temperature rather than a derived one. No.
An eccentricity, so the orbit shape is known. No.
The archive lists no measured equilibrium temperature for this planet. The 1080 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.
The detection is a shadow crossing a disc. Shadows have no weight, which is the whole reason the mass column is empty.
KOI-351 has 8 known planets. A crowded system is worth more than the sum of its planets: the timing of each transit constrains the others.
Found by Kepler in 2013. 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.
Half the temperatures quoted for exoplanets are calculated from the star, not \
measured at the planet. Should a page like this show them at all, or leave the field blank?
