EnVision Example Trajectories
================================

VERSION:        2.0
CREATION_DATE:  2019/07/26 
ORIGINATOR:     ESA/ESOC (P. Munoz)


CONTENT: Trajectory files in OEM (*.oem) and Spice Kernel (*.bsd) formats covering the full mission duration for two different scenarios:
  
  - ESC_T2_2032_SouthVOI: launch into direct escape at -3.0 deg declination and Venus Orbit Insertion over the Southern hemisphere.
  
  - HEO_T2_2032_NorthVOI: launch into HEO (310x100,000 km) and Venus Orbit Insertion over the Northern hemisphere.


NOTES:

  - Trajectory data is consistent with planetary ephemeris DE-432.
  
  - Aerobraking phase is not realistic neither in duration nor in dynamic modelling.
  
  - Science orbit time span (2034/11/26 - 2040/03/24) extended to account for the uncertainty in the date of aerobraking finalisation.
  
  - Venus gravity field expansion to 40x40 degree and order used for propagation of the science orbit.