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ALFOSC Seeing Monitoring
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ALFOSC seeing monitoring data, based on raw frames analysed using SExtractor.
The data has been taken between April 2007 and November 2013.
The table below includes frames with airmass < 1.74 (lower hatch limit),
exposure time more than 70 seconds, more than ten stars found from the
frame, telescope focus 23175+-175 and excluding standard star fields.
| Filter |
Airmass < 1.74
|
ZD vs FWHM plot |
Number of frames |
10 percentiles |
30 percentiles |
50 percentiles |
75 percentiles |
| U
|
316 |
0.84 |
1.01 |
1.18 |
1.39 |
| B
|
741 |
0.80 |
0.90 |
1.04 |
1.28 |
| V
|
1237 |
0.65 |
0.75 |
0.86 |
1.07 |
| R
|
2565 |
0.65 |
0.78 |
0.89 |
1.11 |
| i
|
1327 |
0.58 |
0.69 |
0.82 |
1.09 |
ALFOSC seeing monitoring data, based on raw frames analysed using SExtractor.
The data has been taken between April 2007 and November 2013.
The table below includes frames with airmass > 1.74 (lower hatch limit),
exposure time more than 70 seconds, more than ten stars found from the
frame, telescope focus 23175+-175 and excluding standard star fields.
|
High zenith distance seeing, airmass > 1.74
|
Filter |
Number of frames |
10 percentiles |
30 percentiles |
50 percentiles |
75 percentiles |
| U |
32 |
1.25: |
1.39: |
1.49: |
1.81: |
| B |
46 |
1.10: |
1.22: |
1.43: |
1.52: |
| V |
183 |
0.86 |
1.02 |
1.16 |
1.54 |
| R |
287 |
0.87 |
1.03 |
1.16 |
1.37 |
| i |
160 |
0.68 |
0.79 |
0.87 |
1.07 |
Note, ":" small number of objects
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