CFHT operating manual - Homepage Usask

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CFHT Observatory Manual - Site (Sec.2) http://www.cfht.hawaii.edu/Instruments/ObservatoryManual/CFH... Average background fluxes are quite variable in the infrared. Over a few minutes they typically vary by 1% in J, 2% in H and 0.3% in K. These figures by T. Gerball, obtained at UKIRT, are highly variable, however, especially for J and H. Longward of 2.5 m the background emission is set by thermal radiation from the telescope and from the atmosphere. Mean sky emissivity is 0.35 at 20 m and 0.67 at 27 m. City lighting is relatively small, and quite often completely damped from cloud cover at the 2000-3000 m level. A county ordinance has been adopted, which restrict most lights of the Big Island to low-pressure sodium lamps. For an interesting look at our night light environment at CFHT, see The Light Environment of Mauna Kea. Precipitable Water The summit of Mauna Kea is especially dry and, on clear nights, typical total water content is ~1 mm. It is thus a good site for observations in the near to mid-infrared (1 micron to 25 micron). Wind Throughout the year, the wind rose is clearly bi-modal; a large percentage of the time winds are either 4 of 8 08/07/04 11:20 PM
CFHT Observatory Manual - Site (Sec.2) http://www.cfht.hawaii.edu/Instruments/ObservatoryManual/CFH... easterly or westerly. 50% of the time, wind speed is less than 7 m/s and 84% of the time it is less than 12 m/s. About 5% of the time, they are more than 30 m/s and the telescope must be closed. When observing during strong winds it helps to point only at objects which are situated roughly leeward. Note that these are average values, and that the percentage of very high winds is extremely variable from one period to another. Extinction and Refraction The mean extinction coefficient and refraction versus wavelength for Mauna Kea are shown below. Extinction Curve for Mauna Kea Atmospheric Refraction for Mauna Kea 5 of 8 08/07/04 11:20 PM
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Home Page of ESPaDOnS project http:
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ESPaDOnS: temperature and pressure
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ESPaDOnS: observing procedures http
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ESPaDOnS: examples of frames http:/
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ESPaDOnS: examples of spectra http:
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ObservatoryManual - Maps http://www
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