Pre-Programmed Pointing Lists
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
PPLs can be found in the Planck Legacy Archive.
Augmented Pre-Programmed Pointing Lists
Attitude History Files
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
Focal plane geometry
The Spacecraft-Instrument Alignment Matrix contains the information.....
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
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
Attitude History File
European Space Operations Centre (Darmstadt)