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We report precipitable water vapor (PWV) measurements made at Las CampanasObservatory using optical spectra of H2O lines obtained with the Magellanechelle spectrograph, and calculated using a robust technique that is accurateto 5-10%. Calibration of the relationship between our PWV measurements andopacity values at 225 GHz was made possible by simultaneous tipping radiometerobservations. Based on this calibration, we present Las Campanas Observatorywinter-time precipitable water vapor statistics, measured using the tippingradiometer, during a two month campaign. The median value of 2.8 +- 0.3 mm isconsistent with that measured at the nearby La Silla Observatory during the VLTsite survey. We conclude that, in the Southern hemisphere winter months, we canexpect good conditions for infrared observing (<~1.5 mm) approximately 10% ofthe time at Las Campanas Observatory.

publications of the astronomical society of the pacific

Calibration of the Relationship between Precipitable Water Vapor and 225  GHz Atmospheric Opacity via Optical Echelle Spectroscopy at Las Campanas  Observatory