Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasp..104..140h&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 104, Feb. 1992, p. 140-145.
Astronomy and Astrophysics
Astronomy
5
Astronomical Observatories, Cloud Cover, Seeing (Astronomy), Annual Variations, Calibrating, Histograms, Parallax
Scientific paper
Direct measurements of the seeing for the U.S. Naval Observatory, Flagstaff Station are presented for the years 1986-1991 from the USNO CCD parallax program at the 1.55-m telescope. Cloud-cover and seeing-related statistics are presented for all programs from the same telescope for the years 1969-1990. The data show that seeing at the zenith has a median of 1.3 arcsec and a mode of 1.0 arcsec FWHM; the distribution of observed seeing probably includes a significant contribution from local dome seeing and/or telescope effects. Cloud-cover statistics show that a yearly average of approximately 45 percent of the nighttime hours are clear and 65 percent are usable. Both the cloud-cover and seeing statistics show significant seasonal variations. The Flagstaff data are compared with published statistics from Kitt Peak National Observatory.
Harris Hugh C.
Vrba Frederick J.
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