LTP11 has been agreed to run from 2023-03-13T00:00:00.000 to 2023-06-26T00:00:00.000.
(see SWT-32 MoM)

Orbital context

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. 

Animated Version: Orbit_GSE_2023H1.mp4

Definition for the grey shading representing downlink rates:

  • white = maximum downlink rate at which you can empty the SSMM in ~10 days
  • light-grey = SSMM fill state decreases with everyone operating at EID-A rates
  • mid-grey = SSMM fill state increases within RSW (10 instruments operating) and decreases outside RSW (IS-only breakeven rate < downlink rate < inside-RSW breakeven rate )
  • dark-grey = SSMM fill state increases with just IS operating (downlink rate < IS-only breakeven rate)

RS window placement

As agreed during the SWT-32, the 3 RS windows in H1-2023 will be placed in LTP-11 at the following times and locations:


EXT Start



Range [au]

Range [deg]

Angle Range


Safe Mode Comms Blackout

Largest Comms Roll (star)

GAM Restrictions

(11 d)
2023-03-18T00:00:00 (TBC)2023-03-22T00:00:002023-04-02T00:00:00



15.5inferior conjunction 
no constraints
(14 d)
(5 d)

(star) Note that a short comms roll of 2 degrees is needed towards the end of the LTP, from 13 May until 8 July 2023 (end during LTP13).

GAMs and conjunctions

  • Inferior conjunction from 2023-03-27 to 2023-03-30 does not pose any constraints on science operations nor downlink.
  • No GAM in this period.

Science and calibration planning

Note the text in red highlights adjustments still to be made in SOOP Kitchen plan during Long Term Planning

Overall objectives:

  • Cross-calibration with Earth-based assets (Sun-Earth line crossing).

  • High-resolution observations around the perihelion of 10 April 2023 (0.29 au).

  • Slow-wind connection science.

Coordinated science (and cross-calibration) campaigns:

The SOOP plan has been created in SOOP Kitchen (links below), and final output released (v1).

Before start of RS windows:

  • 2023-03-15: Pointing to East limb for context to PSP quadrature and perihelion - L_FULL_LRES_MCAD_Probe-Quadrature
    (Note we plan to omit the pointing to West limb on 18th to conserve pointing for Metis within 0.55au)
    SOOP Coordinator: A. Zhukov

RSW7 Sun-Earth line crossing & max latitude S (2023-03-22 - 2023-04-02)

  • 2023-03-22: R_SMALL_HRES_MCAD_Full-Disk-Mosaic - 25 pointings to cover full solar disk
    SOOP Coordinator: D. Berghmans 

  • 2023-03-22: Metis-led L_FULL_HRES_HCAD_Eruption-Watch - Disk Centre pointing (Note STEREO-A Opposition on 2023-03-24)
    SOOP Coordinator: D. Spadaro
  • 2023-03-27: SPICE-led L_SMALL_MRES_MCAD_Composition-Mosaic (new) to find connection point with S/C. New style mosaic consisting of 12 pointings, ~4hrs dwell each- pVSTP
    In parallel: instrument-specific cross-calibrations with Earth-bound observatories during Sun-Earth line crossing at 0.41 au (2023-03-28)
    SOOP Coordinators: M. Janvier, A. To, D. Baker 
  • (2023-03-29: BepiColombo opposition)

  • 2023-03-29: R_SMALL_HRES_HCAD_RS-burst, for high-resolution science close to Sun-Earth line crossing. Active target - pVSTP
    SOOP Coordinator: H.Peter
  • 2023-03-29: R_SMALL_HRES_MCAD_Polar-Observations, during max Southern solar latitude (8 degrees) - pVSTP
    SOOP Coordinator: A. Zhukov
  • 2023-03-30: L_SMALL_HRES_HCAD_Slow-Wind-Connection, 3-days-long SOOP with daily tracking of the most likely connection point with the S/C - pVSTP
    SOOP Coordinator: S. Yardley, A. James

RSW8 Perihelion window (2023-04-04 - 2023-04-18)

  • 2023-04-04: R_BOTH_HRES_HCAD_Nanoflares at disk centre
    SOOP Coordinator: S. Parenti
  • 2023-04-04: R_BOTH_HRES_MCAD_Bright-Points at disk centre
    SOOP Coordinator: A. Fludra
  • 2023-04-05: R_SMALL_MRES_HCAD_Sunspot-Oscillationsnew SOOP for sunspot oscillations, still represented by L_TEMPORARYpVSTP
    SOOP Coordinator: A. Fludra
  • 2023-04-05: L_BOTH_HRES_HCAD_Major-Flare for major flare watch test (for SPICE only) pVSTP
    SOOP Coordinator: D. Berghmans (EUI), T. Kucera, A. Inglis (SPICE)
  • 2023-04-05: R_BOTH_HRES_HCAD_Nanoflares for high-resolution science close to perihelion  - pVSTP
    SOOP Coordinator: S. Parenti
  • 2023-04-07: R_SMALL_HRES_HCAD_RS-burst for high-resolution science close to perihelion & PHI stereoscopy with Earth bound observatories (~45 degree angle) - pVSTP
    SOOP Coordinator: S. Castellanos Duran, H. Peter
  • 2023-04-07: L_FULL_HRES_HCAD_Coronal-Dynamics at disk centre, led by Metis
    SOOP Coordinator: D. Spadaro
  • 2023-04-09: L_BOTH_HRES_LCAD_CH-Boundary-Expansion  at disk centre, led by Metis
    SOOP Coordinator: D. Spadaro
  • 2023-04-10: R_BOTH_HRES_HCAD_Nanoflares for 6 hours of PHI observations of a quiet target - pVSTP
    SOOP Coordinator: L. Bellot-Rubio
    Perihelion at 0.29 au
  • 2023-04-10: R_SMALL_HRES_HCAD_RS-burst for high-resolution science and PHI stereoscopy with Earth bound observatories (~67 degree angle) - pVSTP
    SOOP Coordinator: H. Peter
  • 2023-04-11: R_BOTH_HRES_HCAD_Nanoflares placeholder for high resolution science close to perihelion, active target - pVSTP 
    SOOP Coordinator: S. Parenti
  • 2023-04-12: R_FULL_HRES_HCAD_Density-Fluctuations led by Metis and SoloHI, at disk centre. Note STEREO-A Quadrature East at 14:54, Earth Quadrature East at 07:48
    SOOP Coordinator: D. Spadaro (METIS), A. Vourlidas (SoloHI)
  • 2023-04-15: R_BOTH_HRES_HCAD_Nanoflares for prominence (or AR) observations at the East limb (quadrature with Earth) - pVSTP
    SOOP Coordinator: S. Parenti (EUI), T. Kucera (SPICE)
  • 2023-04-15: L_SMALL_MRES_MCAD_Connection-Mosaic (2 days long) for finding the connection point with S/C - pVSTP
    SOOP Coordinator: D. Hassler, V. Zambrana Prado, A. Giunta
  • (2023-04-17: Quadrature with Earth and radial alignment with PSP at 0.7 au)
  • 2023-04-18 (in between RSWs): L_FULL_HRES_HCAD_Eruption-Watch for Metis and SPICE, supported by EUI full disk synoptics - Disk Centre pointing 
    SOOP Coordinator: D. Spadaro

RSW9 (2023-04-20 - 2023-04-25)

Opportunities after RSWs:

  • 2023-06-21: L_FULL_LRES_MCAD_Probe-Quadrature: Pointing to West limb for context to PSP perihelion and quadrature on 22 June 03:45 and 8:38 resp. 
    SOOP Coordinator: A. Zhukov

IS calibrations:

  • 2023-05-29: MAG calibration roll - 13 revolutions around SC-Sun-axis

RS calibrations:

  • 2023-03-20: Metis (+ SoloHI) Calibration CC_OFFPOI_STRAYLIGHT
  • 2023-03-20: Metis (+ SoloHI) Calibration CC_ROLLS_RS
  • 2023-03-21: PHI calibration CC_OFFPOI_FLATFIELD_FULL
  • 2023-04-03: PHI calibration CC_OFFPOI_FLATFIELD_FULL
  • 2023-04-06: PHI calibration CC_OFFPOI_FLATFIELD_FULL (inside 0.32 au)
  • 2023-04-15: PHI calibration CC_OFFPOI_FLATFIELD_FULL
  • 2023-04-20: Metis observation of alpha Leo calibration star 
  • 2023-04-25: PHI calibration CC_OFFPOI_FLATFIELD_FULL
  • 2023-05-08: CC_OFFPOI_STAR placeholder for alpha Virgo observations by both Metis (disk centre pointing) and high-resolution telescopes (limb pointing)
    SOOP Coordinator: L. Teriaca
  • 2023-06-06 to 14: Metis-only star calibrations delta Sco and pi Sco
  • 2023-06-17 to 24: Metis-only star calibration tau Sco

IS-only science:

  • EPD & STIX observations with constant telemetry rates throughout LTPs 10-13

  • Other in situ instruments in high rate whenever within 0.8 au, also beyond 0.8 au in good downlink conditions
    => For LTP11 this means high rates until 
    2023-05-28, then nominal rate (EID-A) for low downlink period far from the Sun

SOOP Kitchen plan

High-level (=MLP) plan: baseline 2 

Starting point for LTP planning in SOWG:

Final plan LTP11:
Output has been formally distributed on 2 Feb 2023 (baseline 9).
Version 2 of the plan (baseline 12) was released on 10 March 2023, after an update of the pass schedule and associated plan updates.

Reference material

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