Mercator Telescope: P7-2000 Atmospheric Extinction (V)

Tonight's atmospheric extinction coefficients in V at the Roque de los Muchachos Observatory. These data are offered by the Mercator Telescope, operated by the "Instituut voor Sterrenkunde" of the Katholieke Universiteit Leuven (Belgium).
The calculations of the extinction coefficients is part of the data reductions made by the photometric group of Geneva Observatory in Switzerland (Gilbert.Burki@obs.unige.ch), which developed the instrument P7-2000 installed on Mercator. These photometric data are made in the Geneva 7-colour system. Hit 'Reload' or 'Shift Reload' to update the information. Data are only available when the photometer is working and the sky presents photometric conditions. The column 'Date' is the date on which the night started.

Important remark: The values for K(V) are only indicative for the atmospheric conditions and are supplied on the Web to help other observers at the Roque de los Muchachos Observatory. The coefficients are obtained on-line and are not the result of the full photometric reduction process (zero-point determination, colour correction etc.). They are therefore not intended to be used in photometric reductions. The atmospheric extinction coefficients in the 7 colours of the Geneva system will be available as soon as possible on the web after validation.

Extinction graph

Extinction coefficient in V evolution with time. X-axis indicates the hours since the beginning of the night. Data about previous nights can be found on this page.

Extinction table