Pioneer Venus Orbiter Ephemeris data are taken from the PDS (Planetary Data System)
site
Available parameters :
xyz_vso : PVO spacecraft position in Venus Solar Orbital Coordinates (VSO): X is taken to be positive in the direction of the Sun measured along the Venus- Sun line. Y is taken to be positive in the direction opposing orbital motion (dusk) and lying in the orbital plane of Venus. Z is taken to be parallel to the pole of the Venus orbital plane and positive in the northward direction (upward normal). The units are given in Venus Radii where Rv = 6050 km.
r : Venus - Spacecraft range.
altitude : Spacecraft Altitude above the Venus surface. This value is computed by subtracting 6050 km from the centered Venus-to-PVO range given in the SEDR.
solar_zenith_angle : This is the three body angle Sun-Venus-PVO taken from the SEDR.
lon : Venus centered longitude.
lat : Venus centered latitude.
xyz_spin_axis_vso : Spin axis coordinates in VSO coordinates.
celestial_lon : Heliocentric Celestial Latitude of the PVO spacecraft.
celestial_lat : Heliocentric Celestial Longitude of the PVO spacecraft.
celestial_lon_earth : Heliocentric Celestial Longitude of the Earth.