Infrared extinction at Sutherland
Measurements of the extinction coefficients per unit airmass in the JHKL (1.25, 1.65, 2.2 and 3.5 μm) bands are presented. The nightly values of the photometric zero-points have also been analysed. It is shown that there is large scatter and an annual variation in the J-H and K-L zero-points while that for H-K is very stable.
KeywordsExtinction Coefficient Water Vapour Content Precipitable Water Vapour Extinction Curve Standard Star
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