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ALFOSC seeing monitoring

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


Back to top Last modified: 10-Dec-2013