A set of acm,gc1,gc2 images were obtained on 20190720 by SJ and AW. Conditions were good and images sets were taken only after guiding and focus stability were obtained.

 

This file: /home/sco/GC_Plate_Scales/20190720/S/README.20190720_gcoffset
==================================================================================
Notes from SJ's log for 20190720

07:43 trying Steve's offset stuff next:
f10 star  #14575 W IFU=000
go_next at 07:44

set up and guide on ACQ, saving images is OFF on everything.

07:56
syscmd -T 'ACQ_offset_fiducial ( dx_asec=5,dy_asec=0,compensate="false")' 
mgp -poff -wf1=-5,0

07:58:45 looks stable, storing images on ACQ/GC1/GC2

08:02:15
syscmd -T 'ACQ_offset_fiducial ( dx_asec=-10,dy_asec=0,compensate="false")' 
mgp -poff -wf1=10,0

stable at 08:04:40
 storing images here.

08:07:00  canceling this trajectory and moving on.
==================================================================================

The image sets were collected and measured.

 

==================================================================================
Collection, review, and measurement of images  

  Position     Time of stable images 
    A         07:58:45.0   08:02:15.0 
    B         08:04:40.0   08:07:00.0 

**********************   Process the acm images  ******************************
   pas_imlistgen l acm N                      # 853 acm images 
   mv list.IMAGES list.acm 

   To collect and measure A position:
   select_pas_images_by_time list.acm EX0 07:58:45.0 08:02:15.0 acmA N          # 21 images 
   Move into ./acmA
    cp ../acmA.* . 
    cp acmA.images list.acmA
    bigds9 list.acmA 1 30                        # all 28 images look pretty good 
    ds9_imstats_fitslist list.acmA FixedRegions N
 
   To collect and measure B position:
   select_pas_images_by_time list.acm EX0 08:04:40.0 08:07:00.0 acmB N          # 15 images 
   Move into ./acmB
    cp ../acmB.* . 
    cp acmB.images list.acmB
    bigds9 list.acmB 1 17                        # all 15 images look pretty good 
    ds9_imstats_fitslist list.acmB FixedRegions N

   To compute the possible sets of offsets: 
    % cd /home/sco/GC_Plate_Scales/20190720 
    % table_XY_offsets.sh ./acmA/XYmean ./acmB/XYmean xmean ymean xme yme N
    % pas_XY_offsets.sh ./acmA/list.acmA ./acmB/list.acmB  1.0  N

    Collect the offsets:
           SCO centroid                                     PAS centroids 
     --------------------------------------        --------------------------------------
     37.774       37.551        0.280     5        37.202       37.262        0.407    18       acmAB  


**********************   Process the gc1 images  ******************************
   pas_imlistgen l gc1 N                      # 5794 gc1 images 
   mv list.IMAGES list.gc1 

   To collect and measure A position:
   select_pas_images_by_time list.gc1 EX0 07:58:45.0 08:02:15.0 gc1A N          # 31 images 
   Move into ./gc1A
    cp ../gc1A.* . 
    cp gc1A.images list.gc1A
    bigds9 list.gc1A 1 40                               # all 31 images look good 
    ds9_imstats_fitslist list.gc1A FixedRegions N

   To collect and measure B position:
   select_pas_images_by_time list.gc1 EX0 08:04:40.0 08:07:00.0 gc1B N          # 22 images 
   Move into ./gc1B
    cp ../acmB.* . 
    cp gc1B.images list.gc1B
    bigds9 list.gc1B 1 40                               # all 22  images look good 
    ds9_imstats_fitslist list.gc1B FixedRegions N
     
   To compute the possible sets of offsets: 
    % cd /home/sco/GC_Plate_Scales/20190720 
    % table_XY_offsets.sh ./gc1A/XYmean ./gc1B/XYmean xmean ymean xme yme N
    % pas_XY_offsets.sh ./gc1A/list.gc1A ./gc1B/list.gc1B  1.0  N

    Collect the offsets:
           SCO centroid                                     PAS centroids 
     --------------------------------------        --------------------------------------
     51.445       51.445        0.308     1        51.458       51.477        0.331    26       gc1AB 


**********************   Process the gc2 images  ******************************
   pas_imlistgen l gc2 N                      # 5797 gc2 images 
   mv list.IMAGES list.gc2 

   To collect and measure A position:
   select_pas_images_by_time list.gc2 EX0 07:58:45.0 08:02:15.0 gc2A N          # 30 images 
   Move into ./gc2A
    cp ../gc2A.* . 
    cp gc2A.images list.gc2A
    bigds9 list.gc2A 1 40                               # eliminate the first 2 images (28 final images) 
    ds9_imstats_fitslist list.gc2A FixedRegions N

   To collect and measure B position:
   select_pas_images_by_time list.gc2 EX0 08:04:40.0 08:07:00.0 gc2B N          # 22 images 
   Move into ./gc2B
    cp ../acmB.* . 
    cp gc2B.images list.gc2B
    bigds9 list.gc2B 1 40                               # all 22 imags are good
    ds9_imstats_fitslist list.gc2B FixedRegions N
     
   To compute the possible sets of offsets: 
    % cd /home/sco/GC_Plate_Scales/20190720 
    % table_XY_offsets.sh ./gc2A/XYmean ./gc2B/XYmean xmean ymean xme yme N
    % pas_XY_offsets.sh ./gc2A/list.gc2A ./gc2B/list.gc2B  1.0  N

    Collect the offsets:
           SCO centroid                                     PAS centroids 
     --------------------------------------        --------------------------------------
     51.914       51.914        0.296     1        51.802       52.011        0.350    25       gc2AB 
 
 

The plate scale values for the one offset (AB) are computed.

 

I collect offsets in  

% pwd
/home/sco/GC_Plate_Scales/20190720/PS_extimates
Build a file names 20190720.dat: 
% cat 20190720.dat
AB
    37.774       37.551        0.280     5        37.202       37.262        0.407    18       acmAB
    51.445       51.445        0.308     1        51.458       51.477        0.331    26       gc1AB
    51.914       51.914        0.296     1        51.802       52.011        0.350    25       gc2AB

Next we compute the plate scale
% gcps.sh 20190720.dat N
To make a plot of the estimates (for example):
 Generic_Points
 % xyplotter_auto gc1_plate_scales q q 1 N
   (edit Axws.1 List.1)
 % xyplotter List.1 Axes.1 N