On 20190711, during engineering work after a FPA takedown, we made observations designed for deriving the gc1,gc2 plate scale. We took sets of acm,gc1,gc2 images with guiding done on acm. We moved acm fiducial to move the scope in approximately 8" and 4" dithers. The RA duties were being perfomed by JP, but MS and SCO were present, with CC as TO. The acm field is extremely rich with stars.
Original notes made by SCO: ================================================================================== Start taking images at 04:01:02 First offset - 04:08:35 Second offset - 04:13:40 I transferred the [acm,gc1,gc2] images to /media/sco/DataDisk1/sco/AD/HET_work/acm_nights/20190711. ==================================================================================
The image sets were collected and measured.
==================================================================================
Collection, review, and measurement of images
Position Time of stable images
P1 04:01:02.0 04:08:35.0
P2 04:08:35.0 04:13:40.0
P3 04:13:40.0 04:23:40.0 ???
********************** Process the acm images ******************************
pas_imlistgen l acm N # 853 acm images
mv list.IMAGES list.acm
There are only 31 acm images in total and my notes are not so
detailed, so I make a full bigds9 review of all images.
% bigds9 list.acm 1 40
**** The last 5 images are empty, so I eliminate them fro list.acm ,
so I start with 26 images.
% bigds9 list.acm 1 30
New time table:
P1 04:01:01.6 04:01:19.9
P2 04:08:15.4 04:09:55.0
P3 04:13:13.5 04:14:44.2
The P1 images are just a few, and then the jump to P2 is very small. Hence, we
really have only one good offset comprised of two positions (A,B):
Pos Start End
A 04:08:15.4 04:09:55.0
B 04:13:13.5 04:14:44.2
To collect and measure A position:
select_pas_images_by_time list.acm EX0 04:08:15.4 04:09:55.0 acmA N # 11 images
Move into ./acmA
cp ../acmA.* .
cp acmA.images list.acmA
bigds9 list.acmA 1 30
ds9_imstats_fitslist list.acmA FixedRegions N
# all 11 images look good
**** I measure 5 stars
To collect and measure B position:
select_pas_images_by_time list.acm EX0 04:13:13.5 04:14:44.2 acmB N # 10 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/20190711
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
-------------------------------------- --------------------------------------
44.827 44.833 0.157 5 44.545 44.253 0.446 10 acmAB
********************** Process the gc1 images ******************************
pas_imlistgen l gc1 N # 35 gc1 images
mv list.IMAGES list.gc1
Pos Start End
A 04:08:15.4 04:09:55.0
B 04:13:13.5 04:14:44.2
To collect and measure A position:
select_pas_images_by_time list.gc1 EX0 04:08:15.4 04:09:55 gc1A N # 16 images
Move into ./gc1A
cp ../gc1A.* .
cp gc1A.images list.gc1A
bigds9 list.gc1A 1 40 # all 16 images look good
ds9_imstats_fitslist list.gc1A FixedRegions N
To collect and measure B position:
select_pas_images_by_time list.gc1 EX0 04:13:13.5 04:14:44.2 gc1B N # 15 images
Move into ./gc1B
cp ../acmB.* .
cp gc1B.images list.gc1B
bigds9 list.gc1B 1 40 # all 15 images look good
ds9_imstats_fitslist list.gc1B FixedRegions N
To compute the possible sets of offsets:
cd /home/sco/GC_Plate_Scales/20190711
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
-------------------------------------- --------------------------------------
61.539 61.539 0.455 1 -999.0 -999.0 -999.0 0 gc1AB
********************** Process the gc2 images ******************************
pas_imlistgen l gc2 N # 35 gc2 images
mv list.IMAGES list.gc2
Pos Start End
A 04:08:15.4 04:09:55.0
B 04:13:13.5 04:14:44.2
To collect and measure A position:
select_pas_images_by_time list.gc2 EX0 04:08:15.4 04:09:55.0 gc2A N # 17 images
Move into ./gc2A
cp ../gc2A.* .
cp gc2A.images list.gc2A
bigds9 list.gc2A 1 40 # all 17 okay (star near edge)
ds9_imstats_fitslist list.gc2A FixedRegions N
To collect and measure B position:
select_pas_images_by_time list.gc2 EX0 04:13:13.5 04:14:44.2 gc2B N # 15 images
Move into ./gc2B
cp ../acmB.* .
cp gc2B.images list.gc2B
bigds9 list.gc2B 1 40 # all 15 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
-------------------------------------- --------------------------------------
62.353 62.353 0.521 1 18.287 17.706 0.577 16 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 20190711.dat:
% cat 20190711.dat
AB
44.827 44.833 0.157 5 44.545 44.253 0.446 10 acmAB
61.539 61.539 0.455 1 -999.0 -999.0 -999.0 0 gc1AB
62.353 62.353 0.521 1 -999.0 -999.0 -999.0 0 gc2AB
Next we compute the plate scale
% gcps.sh 20190711.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