KOI-351 d: 8-Planet System, 0.320 AU Out
Mini-neptune around KOI-351
It is 2.87 times Earth's radius, closest in size to Neptune. A year there lasts 59.74 days, on an orbit 1 times closer to its star than Mercury is to the Sun. Its equilibrium temperature is 519 K (derived from the star rather than measured), hotter than any desert. 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
2.87 Earth radii
Equilibrium temperature
519 K (derived)
One year
59.74 days
Orbit radius
0.3200 AU
Host star
KOI-351 at 6080 K
Distance
2767 light-years
Starlight blocked
0.048% at each transit
What a crossing measures
The fraction of starlight blocked sets the radius against the star's.
Known and unknown, as the archive has it
A radius from transit photometry. Yes.
A measured mass. No.
A density, which decides rock or gas. No.
An orbital distance. Yes.
A measured temperature rather than a derived one. No.
The shape of the orbit. No.
The archive lists no measured equilibrium temperature for this planet. The 519 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.
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.
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.
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?
