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Star Flat Observations » History » Version 10

Klaus Honscheid, 10/31/2012 07:48 PM

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h1. Star Flat Observations
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We want to observe all five filters using 20 pointings under good seeing and photometric condidtions.
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table{border:2px solid black}.
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|_/2. Field Name |_/2. Base RA |_/2. Base Dec |_\5=. No x Time of Exposures |
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|_=. g |_=. r |_=. i |_=. z |_=. Y|
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|{color:teal}. 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 |
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|{color:teal}. 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 |
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The Stripe82 pointing is available early in the night and the Dense Field in the early morning.  Additionally
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any dense field at low galactic latitude would work.
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h3. Scripts and Special Instructions
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Standard exposure scripts are available for each filter for each of the two fields.
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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.
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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).
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table{border:2px solid black}.
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|_=. Field |_=. Script|
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| Stripe 82 | DES/sv_stripe82_g.json |
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| | DES/sv_stripe82_r.json |
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| | DES/sv_stripe82_i.json |
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| | DES/sv_stripe82_z.json |
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| | DES/sv_stripe82_Y.json |
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| Dense Field | DES/sv_densefield_g.json |
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| | DES/sv_densefield_r.json |
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| | DES/sv_densefield_i.json |
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| | DES/sv_densefield_z.json |
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| | DES/sv_densefield_Y.json |
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| Dense Field | DES/sv_starflat_g.json |
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| | DES/sv_starflat_r.json |
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| | DES/sv_starflat_i.json |
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| | DES/sv_starflat_z.json |
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| | DES/sv_starflat_Y.json |
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h2. Dither Pattern
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Use the following offsets for the dither pattern
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table{border:2px solid black}.
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|_=. RA Offset|_=. Dec Offset|
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| 0.0      |  0.0      |
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| 0.027956 |  0.018155 |         
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|-0.027634 |  0.018698 |
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|-0.053566 | -0.063837 |
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| 0.074250 | -0.037825 |    
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| 0.116090 | -0.119586 |
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| 0.064720 |  0.153587 |
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| 0.261366 |  0.174538 |
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|-0.262787 |  0.172391 |
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| 0.395858 | -0.238018 |
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| 0.064422 |  0.457390 |
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|-0.490048 |  0.362453 |
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|-0.142163 | -0.592713 |
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| 0.103031 |  0.750100 |
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|-0.730728 | -0.198247 |
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|-0.629754 |  0.649618 |
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|-0.351912 | -0.833518 |
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|-1.051530 | -0.042188 |
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| 0.449703 | -0.951458 |
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| 0.843755 |  0.517269 |