Abstract
ABSTRACTOptical seeing measurements carried out at Sierra Negra, the site of the Large Millimeter Telescope, are reported. The site, one of the highest peaks in central Mexico, offers good coverage of the northern and southern hemispheres, and we have undertaken several campaigns to investigate the astronomical potential of the site in the optical. Here we report on our campaign to establish the seeing quality of the site. We present data from the first three campaigns of optical seeing monitoring covering 2000 February to 2002 May, carried out with a Differential Image Motion Monitor. The results clearly indicate subarcsecond seeing, better statistics during the dry season, and no dependence on the time of night. We find no dependence of our results on the integration time used.
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