M-Matisse SPICE Kernel Dataset Release Notes v0.0.4
===========================================================================

     This release notes file describes the status of the mission's SPICE
     Kernel Dataset for the given version. This version (0.0.4) provides
     a tag in the M-Matisse Git repository at the SOCCI Bitbucket:

        https://repos.cosmos.esa.int/socci/projects/SPICE_KERNELS/

     Created by Alfredo Escalante Lopez, ESAC/ESA, August 5, 2025.


Contact Information
--------------------------------------------------------

   If you have any questions regarding this file contact the
   ESA SPICE Service at ESAC:

           Alfredo Escalante Lopez
           (+34) 91-8131-429
           spice@cosmos.esa.int


Notes
--------------------------------------------------------

   August 5, 2025 v0.0.4

      Added communication windows pointings in default attitude CKs. The
      strategy to add the communication windows is based on daily passes,
      simultaneous to both spacecrafts, with an average effective downlink
      of 4 hours.
       - For Henri, the communication pointing starts after exit a given
         pericenter pass (altitude greater than 1000km), continues through
         the consecutive apocenter pass, skips one pericenter pass, continues
         through the next apocenter pass, and finally slews to ram-nadir for
         the next pericenter pass.
       - For Marguerite, the communication pointing starts after exit a given
         pericenter pass (altitude greater than 1000km), continues through
         the consecutive apocenter pass until performing 4 hours of effective
         downlink, then slews to Sun pointing for the remaining part of the
         apocenter pass, and finally slews to ram-nadir for the next
         pericenter pass.

      Slews duration in default attitude CK is now variable based on start-end
      orientation and a constant angular rate of 12 degrees per minute.

      Updated M-AC field-of-view angles to 100 degrees full FoV.

      Updated M-MSA reference frame alignment to incorporate mounting tilt
      of 20 degrees.

      Updated Cosmographia spacecrafts 3D model.


Issues fixed for this release
--------------------------------------------------------

   [SPICEPCR-1667] - Update default attitude CK with maxrate slews and comms
                     windows.
   [SPICEPCR-1695] - Generate updated default CKs for 2037 and 2039 scenarios.


Appendix: Release History
===========================================================================

   January 22, 2025 v0.0.3

      Added default attitude CKs for all study scenarios incorporating
      Ram pointing below 1000 km altitude and Sun pointing above 1000 km
      altitude with 15 minutes slews in between. For Sun pointing, roll
      angle around the Sun direction optimises the SPAM LoS alignment
      with the ecliptic and Nadir LoS not obstructed by SC for M-EAS.

      Updated SPAM alignment based on latest placement on +Z SC panel.

      Updated SOSPIM field-of-view aperture angle.

   November 4, 2024 v0.0.2

      Added trajectories and meta-kernels for the following study scenarios:

       - mmatisse_study_2036_EEM_LD21_FDC_IPO1.tm
       - mmatisse_study_2036_EEM_LD21_FDC_IPO2.tm
       - mmatisse_study_2037_T2_LD21_DLC_IPO1.tm
       - mmatisse_study_2037_T2_LD21_DLC_IPO2.tm
       - mmatisse_study_2039_T2_LD21_DLC_IPO1.tm
       - mmatisse_study_2039_T2_LD21_DLC_IPO2.tm

      Extended aareadme descriptions of each scenario:

       - Launch year: 2036/2037 (nominal launch period) or
                      2038/2039 (backup launch period)
       - Transfer type: direct Earth-to-Mars transfer (short T2 or
                        long T4 transfer), or with an intermediate
                        Earth flyby, Earth-Earth-Mars (EEM) transfer
       - Launch day: from 1 to 21, LD1 = LPO, LD21 = LPC
       - Configuration: either father-daughter configuration (FDC)
                        or dual-launch configuration (FDC)
       - Initial parking orbit (IPO): for a given post-MOI
         inclination of 60 degrees, there are two hyperbola
         solutions (IPO1 and IPO2).

   June 20, 2024 v0.0.1

      Added preliminary versions of Instrument Kernels.

      Added default attitude CK based on altitude profile for
      RAM and Sun pointing modes.

   March 27, 2024 v0.0.0

      First draft of the SKD that includes basic frame definitions and ID
      assignments in order to be able to use the mission analysis
      trajectory data and visualize it with Cosmographia. This includes the
      following M-Matisse SPKs:

         henri_ipo1.bsp
         henri_ipo2.bsp
         marguerite_ipo1.bsp
         marguerite_ipo2.bsp

End of aareadme.txt