NAME: linkobj PURPOSE: Cross check three source lists from one field and identify moving objects. DESCRIPTION: CATEGORY: Astrometry CALLING SEQUENCE: linkobj,tag,fna,fnb,fnc,CANDIDATE=cand,NODISPLAY=nodisplay INPUTS: tag - name of the field, should not contain any blanks fna - file name for the earliest image (Frame A) fnb - file name for the middle image (Frame B) fnc - file name for the last image (Frame C) OPTIONAL INPUT PARAMETERS: KEYWORD INPUT PARAMETERS: BADCOL - Array of column numbers, any source found within 2.5 pixels of these columns will be discarded. Default = no bad columns. CANDIDATE - Flag, used for testing, when set will plot all detected sources in all images. If you think a triplet should have been picked up, set this to see if all three images were actually in the original source list. KEYLIST= - Name of a file containing a correspondence list. This list associates a set of standard names with the actual keyword names found in a FITS file header. If this keyword is omitted, a default list is used, as if a file with the following contents had been supplied: AIRMASS K AIRMASS DATE K DATE-OBS DATETMPL T DD-MM-YYYY EXPDELTA V 0.0 EXPTIME K EXPTIME FILTER K FILTERS FILENAME K CCDFNAME OBJECT K OBJECT UT K UT The middle column is a flag. It may be K, for Keyword, T, for Template, or V, for Value. If it is V, the contents of the third field on that line should make sense for the name in the first field. MAXRATE - Maximum motion rate permitted for a tripet, in pixels/hour. The default is 50.0 pixels/hour. MINRATE - Minimum motion rate permitted for a tripet, in pixels/hour. The default is 1.0 pixels/hour. NODISPLAY - Flag, when set will suppress all image display allowing program to be run in background or batch mode. This will be somewhat faster as well. The display steps take a small but non-trivial amount of time. PATH - Optional path for original image directory. If not specified, the current directory is used. OUTPUTS: KEYWORD OUTPUT PARAMETERS: COMMON BLOCKS: SIDE EFFECTS: RESTRICTIONS: PROCEDURE: MODifICATION HISTORY: 1998/03/11, Written by Marc W. Buie, Lowell Observatory 1999/03/22, extracted frmdxdy.pro 2010/07/19, MWB, minor tweak to accomodate change to frmdxdy and stylistic edits.