To measure the pixel locations (i.e. array orientation, scale) as a function of scan mirror angle for the 70 micron array. The goal of this task is to estimate the location of the 70 micron prime frame with repsect to the telescope boresight. The location of the MIPS instrument frames are found in the frame tables and are given as brown angles. In order to estimate the instrument pointing frame (IPF), a combinations of spacecraft moves and mirror motions places the star on several locations on the array. In addition, these observations are "sandwiched" between observations of stars with the two PCRS. The MIPS team calibrates data and centroids the star on the 70 micron array. These centroided values are passed to the IPF team who uses observations of stars with the PCRS to provide the final calibration and estimate brown angles need to locate the instrument frame.
The signal to noise on one side of the array was too poor to result in any useful centroids.
The limits the accuracy of the results.
In order to have the accuracy we want we will need to redo this survey in the 1MC.
The results from the IPF team recommended the following changes to the brown angles for the prime frame : delta_theta_Y (0.0627 arc minutes), delta_theta_Z (0.039 arc minutes), delta_angle (0.0147 degrees). The IPF team gave an accuracy of the locating the prime frame center as 0.4898 arc seconds. The requirement was 2.65 arc seconds. The results of this analysis was used for frame table updata 14.
The resulting frame table contained the following changes:
For a complete summary of frame table updates see :
Frame Table Updates: Meta task 2080
