Before you can use this program, the path to the directory containing the region files must be set. The default is to use the value of the variable ub1path in the source code file libwcs/ubcread.c, which is initially set to /data/ub1, which is where the catalog resides at the Center for Astrophysics. If you do not have access to the source code and need to change the path, you can set the environment variable UB1_PATH to the directory containing the region files, and that will override the file setting.
The minimum command line is imub1 FITS or IRAF filename
The same effect can be obtained by running imcat -c ub1 FITS or IRAF filename
|minid=number||If the object is found on fewer than this many plates, where the range is 2-5, it is left off the list. All Tycho-2 stars, where the catalog value of this number is set to zero, are included unless number is negated. The default value set in the file libwcs/ubcread.c is 0. For the most accurate positions, use minid=4.|
|minpmqual=number||If the proper motion quality flag is less than this number, proper motion is never added to the catalog position. The range is 1-9 from the catalog, or 10 if the proper motion is from the Tycho-2 Catalog. Setting this to 11 will never add proper motion. The default value set in the file libwcs/ubcread.c is 3. For the best proper motions, use minpmqual=9.|