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This page contains orbit plots for both the 'In' and 'Out' variants of the February 2019 trajectory. The trajectories differ only during the first 'Earth-Earth' orbit immediately after launch. For the 'In' variant we launch sunward then approach the Earth for the first GAM from the antisunward direction, while for the 'Out' variant we initially launch antisunward then approach the Earth from the sunward direction for the GAM. After the first GAM the trajectories are identical. The actual trajectory we get will depend on when in the launch window we actually launch. Both trajectories are possible on Feb 14, so the orbits are given starting on that day.

Some details about these plots:

  • Orbits are plotted in the Geocentric Solar Ecliptic frame (X from Earth to Sun, Z perpendicular to the ecliptic plane, positive northward).
  • The orbits are broken down into the six month periods we will use for mission planning (MTPs).
  • The first MTP only contains the trajectory after the end of commissioning (taken to be 98 days after launch).
  • During the NMP and EMP, remote sensing windows are at their default positions. Some of these clash with conjunctions so will need to be moved. This will be part of the mission level planning process.
  • Communications roll information is not yet available so roll angles have been set to zero.
  • GAM restriction periods are marked with a symbol at closest approach -28 days, closest approach, and closest approach +7 days.
  • Data rate shading on the time series represents a rule of thumb for the available data that can be downlinked quickly. As usual, the devil will be in the details.
  • The entire cruise phase for each variant is plotted. The science phases are plotted from the 'In' SPICE Kernel.
  • Two options for RS Checkout window locations are presented for each Cruise variant, 'Plan A' and 'Plan B'. See Cruise Phase Checkout for details.

Cruise Phase Trajectory

'In' Variant, Checkout Plan A

Feb_2019_In_Cruise_Plan_A.pdf (Note the Confluence PDF preview doesn't render these properly, please download to view.) 

'In' Variant, Checkout Plan B

Feb_2019_In_Cruise_Plan_B.pdf (Note the Confluence PDF preview doesn't render these properly, please download to view.)

'Out' Variant, Checkout Plan A

Feb_2019_Out_Cruise_Plan_A.pdf (Note the Confluence PDF preview doesn't render these properly, please download to view.) 

'Out' Variant, Checkout Plan B

Feb_2019_Out_Cruise_Plan_B.pdf (Note the Confluence PDF preview doesn't render these properly, please download to view.) 

Science Phases Trajectory

Feb_2019_Science_Phases.pdf (Note the Confluence PDF preview doesn't render these properly, please download to view.) 

 

 

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