10.1 Spacecraft HK time profiles

• instrument-related HK present in spacecraft telemetry files (and not in instrument telemetry)
• other HK present in spacecraft telemetry files
• reconstructed attitude parameters (computed on the ground)
• orbit ephemeris parameters (computed on the ground)

• instrument-related HK in spacecraft telemetry files

  will be listed together with other instrument parameters (apart from the nature "per observing period" there is logically no difference).

• other HK present in spacecraft telemetry files

  none useful known so far.

• attitude parameters

  • xra and xdec, the celestial coordinates of the satellite X-axis
  • yra and ydec, the celestial coordinates of the satellite Y-axis
  • zra and zdec, the celestial coordinates of the satellite Z-axis (i.e. the one close to the Narrow Field Instrument pointing direction)
  • strconf, the star tracker flag, which assumes the values
    • 0 : no star tracker in use
    • 1 : -X star tracker in use
    • 2 : Y star tracker in use
    • 3 : -X and Y star trackers in use
    • 4 : Z star tracker in use
    • 5 : -X and Z star trackers in use
    • 6 : Y and Z star trackers in use
    • 7 : all three star trackers in use
    • 9 : star tracker information missing in attitude file (old files)

• orbit ephemeris parameters

  • xpos,ypos and zpos, the satellite position
  • xvel,yvel and zvel, the satellite velocity
  • utcflag, the UTC to TAI difference
  • saga, the SAGA (South Atlantic Geomagnetic Anomaly) flag [definition to be clarified care of Telespazio]
  • fromsaga, time since last SAGA entrance
  • edr, the EDR flag [definition to be clarified care of Telespazio]
  • fromedr, time since last EDR entrance

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