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Plots are in GSE (geocentric solar ecliptic) coordinates, so Earth is at [0,0], the Sun is at [1,0]. The plot is the projection of the orbit on the ecliptic plane.

Second NMP orbit, including 3 RSwindows.

RS windows (default placement):

EXT Start
Safe Mode Comms Blackout

Largest Comms Roll

GAM Restrictions
MTP 06South2021-09-042021-09-082021-09-180.700.640.58-05.07-05.12-05.03161164169NOYES (RSW Days 8 to 10)00NO
MTP 06Perihelion2021-10-062021-10-102021-10-200.360.340.37-00.5002.4704.30134110087NONO00NO
MTP 06North2021-10-202021-10-232021-11-020.380.440.4904.7305.1104.82075059047NONO00YES
MTP 06VGAM 4N/A2021-11-23 

VGAM4 at 2021-11-23, so 3rd RSW need to moved out of 2021-10-23 to 2021-12-01 period, i.e. shift 10 days earlier or move to completely different period.

New proposal for RSwindow placement:

  • Keep MTP06 South and Perihelion
  • MTP06 North can be moved without loosing science as the max inclination of this orbit (<5º) is negligible anyway. It can be moved either to:
    1. After the VGAM, to end 2021 or start 2022, i.e the very end of MTP06 or start MTP07. This option has extremely good TM but will be far from the Sun, e.g. ending around 0.8AU.
    2. Move between MTP06 south and perihelion windows. Depending on the science goal you may want to concatenate it to any of those two, or move all 3 windows together to cover 30 consecutive days of RS operations (may have drawback for calibration opportunities though).
  • Option 1 has the advantage that it can partially solve the problem of the huge underrun expected for end 2021-start 2022. Also the MTP06 perihelion window can be heavily loaded with TM, stored onboard, and dumped once we have moved closer to Earth.

SOOP planning proposals

I_DEFAULT outside of RSwindows, L_IS_STIX on inside all RSwindows

  • MTP06-North: to be started asap after GAM, i.e. 30 Nov 2021 running until 9 Dec 2021 (implies NO precursors). Solar distance range of 0.77AU to 0.82AU. To be decided by SWT whether this is worth pursuing (SoloHI and Metis restrictions).

Current model (SAP v0): RS windows at default locations still


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