Project

General

Profile

Star Flat Observations » History » Version 13

Robert Armstrong, 11/16/2012 02:38 PM

1 1 Robert Armstrong
h1. Star Flat Observations
2 1 Robert Armstrong
3 3 Robert Armstrong
We want to observe all five filters using 20 pointings under good seeing and photometric condidtions.
4 1 Robert Armstrong
5 1 Robert Armstrong
table{border:2px solid black}.
6 6 Klaus Honscheid
|_/2. Field Name |_/2. Base RA |_/2. Base Dec |_\5=. No x Time of Exposures |
7 1 Robert Armstrong
|_=. g |_=. r |_=. i |_=. z |_=. Y|
8 1 Robert Armstrong
|{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 |
9 1 Robert Armstrong
|{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 |
10 12 Robert Armstrong
|{color:teal}. 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 |
11 1 Robert Armstrong
12 1 Robert Armstrong
The Stripe82 pointing is available early in the night and the Dense Field in the early morning.  Additionally
13 13 Robert Armstrong
any dense field at low galactic latitude would work.  The Dense Field in the South is available in the morning as well.
14 1 Robert Armstrong
15 7 Klaus Honscheid
h3. Scripts and Special Instructions
16 7 Klaus Honscheid
17 7 Klaus Honscheid
Standard exposure scripts are available for each filter for each of the two fields.
18 7 Klaus Honscheid
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.
19 10 Klaus Honscheid
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).
20 7 Klaus Honscheid
21 8 Klaus Honscheid
table{border:2px solid black}.
22 7 Klaus Honscheid
|_=. Field |_=. Script|
23 9 Klaus Honscheid
| Stripe 82 | DES/sv_stripe82_g.json |
24 9 Klaus Honscheid
| | DES/sv_stripe82_r.json |
25 9 Klaus Honscheid
| | DES/sv_stripe82_i.json |
26 9 Klaus Honscheid
| | DES/sv_stripe82_z.json |
27 9 Klaus Honscheid
| | DES/sv_stripe82_Y.json |
28 9 Klaus Honscheid
| Dense Field | DES/sv_densefield_g.json |
29 9 Klaus Honscheid
| | DES/sv_densefield_r.json |
30 9 Klaus Honscheid
| | DES/sv_densefield_i.json |
31 9 Klaus Honscheid
| | DES/sv_densefield_z.json |
32 9 Klaus Honscheid
| | DES/sv_densefield_Y.json |
33 10 Klaus Honscheid
| Dense Field | DES/sv_starflat_g.json |
34 10 Klaus Honscheid
| | DES/sv_starflat_r.json |
35 10 Klaus Honscheid
| | DES/sv_starflat_i.json |
36 10 Klaus Honscheid
| | DES/sv_starflat_z.json |
37 10 Klaus Honscheid
| | DES/sv_starflat_Y.json |
38 7 Klaus Honscheid
39 7 Klaus Honscheid
40 1 Robert Armstrong
h2. Dither Pattern
41 1 Robert Armstrong
42 11 Eric Suchyta
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.)
43 1 Robert Armstrong
44 1 Robert Armstrong
table{border:2px solid black}.
45 1 Robert Armstrong
|_=. RA Offset|_=. Dec Offset|
46 1 Robert Armstrong
| 0.0      |  0.0      |
47 1 Robert Armstrong
| 0.027956 |  0.018155 |         
48 1 Robert Armstrong
|-0.027634 |  0.018698 |
49 1 Robert Armstrong
|-0.053566 | -0.063837 |
50 1 Robert Armstrong
| 0.074250 | -0.037825 |    
51 1 Robert Armstrong
| 0.116090 | -0.119586 |
52 1 Robert Armstrong
| 0.064720 |  0.153587 |
53 1 Robert Armstrong
| 0.261366 |  0.174538 |
54 1 Robert Armstrong
|-0.262787 |  0.172391 |
55 1 Robert Armstrong
| 0.395858 | -0.238018 |
56 1 Robert Armstrong
| 0.064422 |  0.457390 |
57 1 Robert Armstrong
|-0.490048 |  0.362453 |
58 1 Robert Armstrong
|-0.142163 | -0.592713 |
59 1 Robert Armstrong
| 0.103031 |  0.750100 |
60 1 Robert Armstrong
|-0.730728 | -0.198247 |
61 1 Robert Armstrong
|-0.629754 |  0.649618 |
62 1 Robert Armstrong
|-0.351912 | -0.833518 |
63 1 Robert Armstrong
|-1.051530 | -0.042188 |
64 1 Robert Armstrong
| 0.449703 | -0.951458 |
65 1 Robert Armstrong
| 0.843755 |  0.517269 |