Our database knows that
are orbiting stars.
Its most recent synchronization with Exoplanets Archive
was produced on .
Earth Similarity Index is known for
Habitable zone limits are known for of host stars.
st_lum column value (stellar luminosity in solar units), present in the original data, is available in the Archive only for a small fraction of entries (about 15% in May, 2016) and it is expressed in log(solar) units, which sometimes may not be very convenient for our usage.
We used the stellar luminosity formula from the Planetary Habitability Laboratory page in order to re-calculate the stellar luminosity values for our database. It increased the percentage of available data up to 88% for this parameter.
pl_insol column value (insolation flux) is derived from stellar luminosity and distance from host star values. In the Archive, this value is available for only about 1.5% of registered planets, which is very few, taking into account that it is critical for ESI calculation.
The formula cited on page 8 of this Philip Kaaret's presentation helped us to calculate the insolation flux for 44% of registered exoplanets.
The limits of stars' habitable zones are not included into the data available from the Archive. The implementation of their calculation is explained on a dedicated page.
The Earth Similarity Index is not present in the data from the Archive, so we implemented it as function of a planet's stellar flux and radius, according to the formula available from the Planetary Habitability Laboratory page.