# this directory contains 
#   1. the raw star lists produced by earlier steps of the pipeline, 
#   2. a subset of the big reference catalog, containing positions
#          for stars within the boundaries of this set of images
# and
#   3. we put the astrometrically calibrated stars lists here, too
output_dir    ../output

# a temp file for intermediate results (which we put in the output_dir)
temp_file      astrom_temp.dat


# offset between the RA and Dec values in the FITS header,
#   and the true RA and Dec values at the center of the image.  
#   The sense is
#   
#       true RA  = FITS RA  + ra_offset
#       true Dec = FITS Dec + dec_offset
#
# values are in decimal degrees
#
ra_offset       -0.10 
dec_offset      -0.20

# we iterate at most this many times to find the precise center
#   of the TASS image.  A value of 0 means 'use the initial guess,
#   do not iterate at all'
iter_center      1

# size of the TASS field (in degrees)
tass_fov         4.2

# approx size of the TASS CCD chip, along each side (in pixels)
tass_npix      2030

# these are the positions of the optical axis on the chip, in raw
#   (row, col) pixel coords.  When we rescale the raw (row, col) coords
#   of each star prior to matching with a catalog, we expand around
#   this point
axis_rowpos    1015
axis_colpos    1015

# pick the brightest 'tass_nstar' stars out of TASS file for matching purposes
tass_nstar      300

# this file holds objects detected in the TASS images
tass_subset      tass_subset.dat

# columns in the TASS data file which contain X, Y, mag
tass_x           1
tass_y           2
tass_mag         5

# pick the brightest 'astrom_nstar' stars out of the 
#   astrometric catalog for matching
astrom_nstar    200

# we need two temp files to hold reference stars, which we put in 
#   the output_dir
#   this one holds all the astrometric stars in the field, coords (RA, Dec)
astrom_infield    astrom_infield.dat
#   this one holds only the 'astrom_nstar' brightest, coords (xi, eta)
astrom_subset     astrom_subset.dat


# columns in the astrometric data file which contain X, Y, mag
astrom_x          0
astrom_y          1
astrom_V_mag      3
astrom_I_mag      4

# parameters for the 'match' program.
#   Recall that angular values are in decimal degrees
match_exe        match
match_trirad      0.0015
match_nobj       60
match_matchrad    0.0000242
match_order       cubic
match_transonly   
match_recalc      recalc
match_maxiter     3
match_haltsigma   1.0e-11
match_scale       1.0

# parameters for the 'apply_match' program
apply_match_exe  apply_match

# parameters for the 'photom_match' program
photom_match_exe photom_match

# the executable we need to change values in the image's FITS header
#   to reflect our knowledge of its (RA, Dec) position
putsym_exe       putsym