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Star Flat Observations

We want to observe all five filters using 20 pointings under good seeing and photometric condidtions.

Field Name Base RA Base Dec No x Time of Exposures
g r i z Y
Stripe82 348.0 0.0 20 x 80 s 20 x 80 s 20 x 100 s 20 x 100 s 20 x 50 s
Dense Field 94.15 -23.6 20 x 80 s 20 x 80 s 20 x 100 s 20 x 100 s 20 x 50 s
Dense Field in South 96.719 -37.677 20 x 80 s 20 x 80 s 20 x 100 s 20 x 100 s 20 x 50 s

The Stripe82 pointing is available early in the night and the Dense Field in the early morning. Additionally
any dense field at low galactic latitude would work. The Dense Field in the South is available in the morning as well.

Scripts and Special Instructions

Standard exposure scripts are available for each filter for each of the two fields.
The first exposures in each sequence slews the telescope to the coordinates given in the table above. The remaining exposures are then dithered according to the pattern given below.
We also provide a generic script for each filter that performs the same dither pattern starting from the current telescope position (DES/sv_starflat_xx.json).

Field Script
Stripe 82 DES/sv_stripe82_g.json
DES/sv_stripe82_r.json
DES/sv_stripe82_i.json
DES/sv_stripe82_z.json
DES/sv_stripe82_Y.json
Dense Field DES/sv_densefield_g.json
DES/sv_densefield_r.json
DES/sv_densefield_i.json
DES/sv_densefield_z.json
DES/sv_densefield_Y.json
Dense Field DES/sv_starflat_g.json
DES/sv_starflat_r.json
DES/sv_starflat_i.json
DES/sv_starflat_z.json
DES/sv_starflat_Y.json

Dither Pattern

Use the following offsets for the dither pattern. The units are degrees. (Note the units in the script file will be arcseconds for the dither offsets.)

RA Offset Dec Offset
0.0 0.0
0.027956 0.018155
-0.027634 0.018698
-0.053566 -0.063837
0.074250 -0.037825
0.116090 -0.119586
0.064720 0.153587
0.261366 0.174538
-0.262787 0.172391
0.395858 -0.238018
0.064422 0.457390
-0.490048 0.362453
-0.142163 -0.592713
0.103031 0.750100
-0.730728 -0.198247
-0.629754 0.649618
-0.351912 -0.833518
-1.051530 -0.042188
0.449703 -0.951458
0.843755 0.517269