Survey history

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

• comments

PPLs can be found in the Planck Legacy Archive.

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.

The AHF contain the following information ordered in columns:

Focal plane geometry

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

Orbit file

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