h is the altitude of the s/c above the surface of Mercury (km). V is the s/c inertial speed relative to Mercury (m/s).
Apsides table Pi is the i-th periapsis and Ai is the i-th apoapsis. Lat and Lon is the location of the sub-spacecraft point on Mercury.
The eccentricity is calculated as ecc = (DA - DP) / (DA + DP), where DA and DP are the distance of the s/c from the center of Mercury at periapsis and apoapsis.
The orbital period (T, hours) is calculated as the time between two consecutive periapsides or apoapsides.
Nodes table Ai is the i-th ascending node and Di is the i-th descending node. Lon is the longitude of the sub-spacecraft point on Mercury (the latitude is zero).
The reference plane is Mercury's equator.