Statistics – Computation
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986msngr..44...32r&link_type=abstract
The Messenger, vol. 44, p. 32-35
Statistics
Computation
9
Earth Atmosphere:Extinction, Extinction:Earth Atmosphere
Scientific paper
The observations made in the sevencolour photoelectric photometry of Geneva Observatory are carried out in a very systematic mannner with equipment which allows a precise and stable definition of the passbands. Ouring these last ten years, the Geneva observers have had permanent access to a small telescope installed at La Silla (altitude: 2,400 m; latitude: -29°). These circumstances have allowed us to undertake several programmes which we have already presented here (The Messenger No. 31, 1983). Retrospectively, this series of observations has been reexamined with the aim of extracting a precise appreciation of the atmospheric extinction in each passband as weil as its evolution with time. Actually, during 4 nights out of 5 we do not measure the value of the atmospheric extinction: the reduction to outside the atmosphere of the measurements is then made by using the mean extinction values. Simplifying the problem, we can summarize the computation of the magnitudes outside the atmosphere by the following formula.
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