Survey history

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Pre-Programmed Pointing Lists[edit]

The Pre-Programmed Pointing Lists (PPL) are made by Planck Science Office from the Baseline Scanning Strategy with the help of the Software Planning and Performance Tool. They are sent to MOC/FD for use in making the Augmented Pre-Programmed Pointing Lists (APPL) used for commanding the spacecraft attitude.

The PPL file name is the following: YYYYMMDD_yyyymmdd_NNNN_X.PPL

with YYYYMMDD = start date of the valid span of the PPL file

yyyymmdd = end date of the valid span of the PPL file

NNNN = unique sequence number, in the range 0000 ≤ NNNN ≤ 9999, incrementing sequentially throughout the mission and uniquely identifying each new PPL file that is generated (i.e. no repeated numbers and no gaps in the sequence of PPLs) o 0000-8999 reserved for PSO o 9000-9999 reserved for attitude manoeuvres generated by MOC

X = type of PPL, as follows: o R = Routine (standard 4-week PPL) o C = Contingency (3-day replanning) o L = Long-Term PPL (LTPPL) o S = Special

PPLs contain the following information in ASCII columns:

  • pointing reference number
  • Ecliptic longitude
  • Ecliptic latitude
  • nominal start time for pointing
  • earliest allowed start time
  • latest allowed start time
  • nominal dwell time
  • observation type
  • comments

PPLs can be found in the Planck Legacy Archive.

Augmented Pre-Programmed Pointing Lists[edit]

APPLs are made by MOC / Flight Dynamics using pointing information (PPLs) from the Planck Science Office.

The APPLs incorporate information about the Operational Days boundaries in order to fit pointings into each OD.

Attitude History Files[edit]

The pointing history of Planck is described in the Attitude History Files (AHF) sequence. All the AHF can be found in the Planck Legacy Archive, for three different methods of computation (AHF, DHF, GHF).

The GHF are made using refined pointing information from the Fiber Optics Gyroscope.

The AHF contain the following information ordered in columns:

Rotation velocity of the spacecraft[edit]

Focal plane geometry[edit]

The Spacecraft-Instrument Alignment Matrix contains the information.....

Orbit file[edit]

The orbit file is produced by the Flight Dynamics team at ESOC and contains the information of the Planck orbital history throughout the whole mission (since launch).

Planck operational state history[edit]

The POSH consists of two parts:

  • mission events
  • state vector

Pre-programmed Pointing List

[ESA's] Mission Operation Center [Darmstadt, Germany]

Augmented Preprogrammed Pointing List

Planck Science Office

Operation Day definition is geometric visibility driven as it runs from the start of a DTCP (satellite Acquisition Of Signal) to the start of the next DTCP. Given the different ground stations and spacecraft will takes which station for how long, the OD duration varies but it is basically once a day.

Attitude History File

European Space Operations Centre (Darmstadt)