MOPEX User's Guide - IRSA

MOPEX User’s Guide
They do not necessarily reflect the size of final mosaic as the pixel size sent to Mosaic
Interpolate can be different. They can be ignored.
This file can be edited to produce a sub-mosaic at the center with a size of 100 by 100
default pixels and orientation of -45.0 deg E of N by changing the following lines:
\real CROTA2 = -45.0
\real CRPIX1 = 50.5
\real CRPIX2 = 50.5
\int NAXIS1 = 100
\int NAXIS2 = 100
3. Re-run Mosaic but this time with the following settings:
• In the Initia l Settings, specify the name of the new FIF file as input;
• Remove the Fiducial Image Frame module from the pipeline to prevent it
overwriting the new FIF;
• Include the Mosaic Geometry module in the pipeline;
The Mosaic Geometry module will create new lists of the input data, uncertainty and
mask files that cross the modified FIF, and will pass those lists on to the subsequent
modules in the Mosaic flow. The new lists are saved as geom_*.txt. (Insertion of Mosaic
Geometry is not required to make a mosaic, but creates the lists and shortens subsequent
tasks to the shorter list.)
Mosaicking to an alternate FIF from, for example, another dataset, just requires step 3
above.
5.4 Creating a Mosaic of a Moving Object
This functionality is limited to Spitzer data. Some Spitzer observations are designed for moving
targets, such as comets or asteroids. Moving target coordinates are written in the input image
header with the keywords RA_REF and DEC_REF. The keywords are written in the headers of
all input images, regardless of whether the moving object is present in the frame.
MOPEX can create a mosaic in the rest frame of the moving object by setting the Moving Object
Mosaic value in the Mosaic Settings module. On the command line, you should set the parameter
MOVING_OBJECT_MOSAIC in the General Settings section. The value specifies the frame
Mosaicking (mosaic.pl) 47
Creating a Mosaic of a Moving Object