Some excellent recent seeing

Fall and spring tend to have the best weather in southern Arizona.  They are the transitional periods between the summer monsoon season and winter rainy season and are usually dominated by strong high pressure systems.  In addition to clear, dry air these weather patterns also tend to produce the best seeing.  We have been in such a pattern for the past couple weeks or so and have had good to excellent seeing during this time.  The best was on the night of October 25-26.  Shown here is a histogram of the seeing as measured with our Shack-Hartmann wavefront sensor.  The best seeing here is 0.29″ at an airmass of 1.22 which corresponds to a seeing at zenith of 0.26″!


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