We present the first results of a long-term seeing measurement program at the University of Hawaii 2.2-m telescope on Mauna Kea. During a one-year period from 1985 August 10 to 1986 August 13 the median seeing was 0788 for a wavelength of 0.7 |xm. The weak correlations of the UH 2.2-m seeing with the dome thermal environment and with the CFHT 3.6-m seeing indicate that the UH 2.2-m dome and the atmosphere make comparable contributions to the total seeing. There is no significant dependence on wavelength (over the range 0.61 |xm to 0.82 |xm), wind direction, or time of year. Increasing wind speed however does contribute negatively to the seeing. These data will be used as a baseline against which planned improvements to the dome thermal balance of the UH 2.2-m telescope will be assessed.

The average seeing at the University of Hawaii 2.2 m telescope from 10 August 1985 to 9 January 1986 was 0.95 ± 0.02 arcsec full width at half -maximum at a wavelength of 0.70 Fun. We believe that the dome makes substantial contributions to this average because the seeing degrades with increasing temperature difference between a point near the primary mirror and the outside air.There is no significant dependence on wavelength (over the range 0.63 -0.82 Fun), wind direction, or time (over the interval covered to date).The data reported in this paper are the baseline against which we will assess the results of a long -term program of dome thermal balance improvements. ResultsThe average seeing was 0.95 ± 0.02 arcsec FWHM as determined from 62 measurements on 54 156 / SP /E Voi 628 Advanced Technology Optical Telescopes Ill (1986) Synoptic seeing measurements at the University of Hawaii 2.2m telescope AbstractThe average seeing at the University of Hawaii 2.2m telescope from 10 August 1985 to 9 January 1986 was 0.95 ±0.02 arcsec full width at half-maximum at a wavelength of 0.70 jjm. We believe that the dome makes substantial contributions to this average because the seeing degrades with increasing temperature difference between a point near the primary mirror and the outside air. There is no significant dependence on wavelength (over the range 0.63-0.82 pm), wind direction, or time (over the interval covered to date). The data reported in this paper are the baseline against which we will assess the results of a long-term program of dome thermal balance improvements.