ALFOSC rotation centre monitoring
The rotation centre is calculated from two consecutive frames
with rotator turned 180 degrees between the frames.
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ALFOSC rotation centre monitoring
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| Date / night |
x-rc average |
y-rc average |
x-standard deviation |
x-standard deviation |
Number of stars |
x range |
y range |
x avg |
y avg |
Rotator position |
Image |
Instrument change |
Comments |
| 23-12-2015 |
1041.2 |
1028.3 |
0.21 |
0.13 |
14 |
111-2002 |
170-1914 |
1111 |
1146 |
-158, 22 |
ALyl230344-5 |
23-12-2015 |
R-filter(#76) ; 2 rotator angles |
| 02-06-2015 |
1073.1 |
994.6 |
0.31 |
0.30 |
12 |
275-2000 |
52-1936 |
1196 |
939 |
-155, 24 |
ALyf020201-2 |
02-06-2015 |
R-filter(#76) ; 2 rotator angles |
| 13-06-2014 |
1076.0 |
989.4 |
0.29 |
0.32 |
26 |
84-2081 |
29-1958 |
1075 |
980 |
-159, 20 |
ALxf130082-83 |
12-06-2014 |
R-filter(#76) ; 2 rotator angles |
| 22-09-2013 |
1073.2 1069.8 |
994.9 992.3 |
0.27 & 0.27 |
0.40 & 0.22 |
22 & 25 |
110-1988 |
17-1960 |
1016 |
786 |
-134, 46 |
ALwi220059-61 |
22-09-2013 |
R-filter(#76) ; 2 rotator angles; three frames |
| 07-09-2013 |
1067.4 |
980.6 |
0.36 |
0.20 |
12 |
104-1987 |
75-1786 |
1016 |
786 |
-131, 55 |
ALwi070224-5 |
06-09-2013 |
R-filter(#76) ; 2 rotator angles |
| 02-06-2013 |
1067.0 |
1002.5 |
0.66 |
0.19 |
10 |
145-1972 |
29-1849 |
948 |
893 |
-128, 52 |
ALwf020232-3 |
28-05-2013 |
i-filter(#12) ; 2 rotator angles |
| 03-02-2013 |
1066.5 |
1001.0 |
|
|
2 |
|
|
|
|
|
ALwb030171-4 |
03-02-2013 |
V-filter ; 4 rotator angles |
| 09-01-2012 |
1069.1 |
1006.6 |
0.38 |
0.17 |
29 |
177-2053 |
24-1924 |
1199 |
922 |
22,-157 |
ALva090306-7 |
09-01-12 |
i-filter |
| 26-12-2011 |
1072.4 |
998.2 |
0.23 |
0.17 |
33 |
76-2049 |
183-1978 |
1069 |
1000 |
-2,-182 |
ALul260059-60 |
16-12-11 |
R-filter |
| 15-11-2011 |
1072.1 |
1007.1 |
0.29 |
0.20 |
36 |
82-1960 |
17-1952 |
1108 |
1072 |
114,-65 |
ALuk150226-7 |
10-11-11 |
R-filter |
The centre of the imaging area of the CCD is x=1074, y=1024.
Some older data:
July 2006 (pg110089-90)
18 stars, average from two measurements, accuracy
about two pixels.
The drift between the first and third images was
x=+3.2 and y=-2.7 pixels
and standard deviation
of one measurement 0.3 pixels or better.
x = 1088,
y = 996
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ALFOSC rotation center measured from data taken on the night of 20
January 2004 from 42 stars spread over the field:
x = 1082.31 , Standard dev.: 0.28
y = 995.86 , Standard dev.: 0.24
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November 2004
x = 1085,
y = 997
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