NAME:
  rdainfo
 PURPOSE:
  Read final astrometry information file.
 DESCRIPTION:

 CATEGORY:
  File I/O
 CALLING SEQUENCE:
  rdainfo,file,object,firstfile,nobs,rmag,rmagerr,rate,angle,arc,
                  dt,vsig,sel,dist,nobj
 INPUTS:
  file - Information file to be read.
 OPTIONAL INPUT PARAMETERS:

 KEYWORD INPUT PARAMETERS:

 OUTPUTS:
  object    - Name of object measured (string)
  firstfile - Name of file (may include chip id) of first measure (string)
  nobs      - Number of observations of this object in this dataset (int)
  rmag      - Average R magnitude of object (float)
                 99.9 means no good magnitude could be measured
  rmagerr   - Error on R magnitude of object (float)
  rate      - Rate of motion, arcsec/hour (float)
  angle     - Direction of motion, E from N, degrees (float)
  arc       - Arclength of this measurement, arcsec (float)
  dt        - Time span of this measurement, hours (float)
  vsig      - velocity dispersion of measurements, sigma of "/hr (float)
                  valid only when nobs>2
  sel       - Solar elongation, degrees (int)
  dist      - Approximate distance to object, AU (float)
                  this assumes object is precisely at opposition.
  nobj      - Total number of obects (0 if file is empty or missing).

 KEYWORD OUTPUT PARAMETERS:

 COMMON BLOCKS:

 SIDE EFFECTS:

 RESTRICTIONS:

 PROCEDURE:

 MODIFICATION HISTORY:
  2003/04/30, Written by Marc W. Buie, Lowell Observatory