HFI operations

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All satellite operations, including those for the HFI(Planck) High Frequency Instrument instrument were under ESAEuropean Space Agency MOC[ESA's] Mission Operation Center [Darmstadt, Germany] responsibilty for obvious safety reasons. The HFI(Planck) High Frequency Instrument instrument operations were nevertheless delegated to the HFI(Planck) High Frequency Instrument Instrument Operations Team (IOTInstrument Operation Team), set up within the HFI(Planck) High Frequency Instrument consortium and under the HFI(Planck) High Frequency Instrument Principal Investigator responsibility. Instrument management, operations and parameter monitoring were thus prepared and controlled by the IOTInstrument Operation Team and serviced by MOC[ESA's] Mission Operation Center [Darmstadt, Germany] either in near real time during the DTCPDaily Tele-Communication Period or uploaded in the satellite mission timeline for deferred execution. The HFI(Planck) High Frequency Instrument instrument health and science data quality was monitored daily by the IOTInstrument Operation Team from launch till the end of the HFI(Planck) High Frequency Instrument extension mission phase. Apart from ground based tests, different operations phases occurred, as listed below.

  • 14/05/2009-18/05/2009 Launch Early Operational Phase.
  • 18/05/2009-09/07/2009 Commissioning Phase. The operations during this phase were under ESAEuropean Space Agency's Planck Project responsibilty. The main HFI(Planck) High Frequency Instrument activities were functional tests of the instrument and its cooldown to 100 mK. Given the performance, the helium flow was set to the minimal one giving an End Of Life estimation of the second half of January 2012.
  • 10/07/2009-12/08/2009 Calibration and Performance Verification Phase. The operations during this phase were under the responsibility of ESAEuropean Space Agency's Planck Science Office. The main HFI(Planck) High Frequency Instrument operations were performance tests and activities to measure the effects of several systematics. The only instrument failure happened on the 6th of August, where the electronic part of the 4-K cooler was switched off, probably due to a major cosmic particle. It has to be noted that no tuning of the HFI(Planck) High Frequency Instrument parameters were executed in-flight until the end of the full HFI(Planck) High Frequency Instrument mission, except in December 2009 for an adjustment of the on-board numerical compression parameters.
  • 12/08/2009-28/11/2010 HFI(Planck) High Frequency Instrument Nominal mission.
  • 28/11/2010-13/01/2012 HFI(Planck) High Frequency Instrument Extended mission.
  • 13/01/2012-03/10/2013 LFI(Planck) Low Frequency Instrument "only" extension phase.

The detailed operational timeline for HFI(Planck) High Frequency Instrument is given in this annex.