Las Campanas Observatory seeing measurements

Details Las Campanas Observatory seeing measurements Las Campanas Observatory seeing measurements

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990exa.....1..195p&link_type=abstract

Experimental Astronomy (ISSN 0922-6435), vol. 1, no. 3, 1990, p. 195-212.

Physics

Optics

9

Astronomical Observatories, Seeing (Astronomy), Angular Resolution, Atmospheric Optics, Image Analysis, Site Selection

Scientific paper

Instrumentation built to record seeing data automatically via image motion measurements of bright stars in small telescopes is described. The centroid of the star image is found 256 times/s in one dimension and is analyzed on-line. The device works over a range of FWHM values as would be seen through a large telescope between less than 0.1 and 3.0 arcsec. The first results for two identical instruments set up at two locations near the duPont Telescope at Las Campanas Observatory are reported. For a total of 61 nights of data (450 h at each site), the median seeing is 0.6 arcsec, with quartiles at 0.4 and 0.8 arcsec. These are FWHM values referred to 5000 A at the zenith. So far, the two sites are indistinguishable on average.

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