Blanco Seeing Statistics, 2000 and before

[As part of the move to the NOIRLab web site, this page is not to be migrated and its contents have been archived in]

In the following, 'Night report' refers to the number selected by the observer in the night report among the proposed categories: <0.4; 0.4-0.6; 0.6-0.8; 0.8-1.0; 1.0-1.5; 1.5-2.0; 2.0-3.0; >3.0. Actually, I use and plot the average of these respective categories: 0.4; 0.5; 0.7; 0.9; 1.25; 1.75; 2.5; 3.0. The numbers usually reflect the wavelength of interest of the instrument used (i.e. for example f/14 night reports yield a seeing estimate at about 2 microns).

Note: all the seeing data presented above was taken with the Carnegie monitor. 9499 samples per year means an average of 26 per night, corresponding to an average of 3 hours continuous sampling per night.