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Traditional color and airmass corrections can typically achieve ~0.02 magprecision in photometric observing conditions. A major limiting factor is thevariability in atmospheric throughput, which changes on timescales of less thana night. We present preliminary results for a system to monitor the throughputof the atmosphere, which should enable photometric precision when coupled tomore traditional techniques of less than 1% in photometric conditions. Thesystem, aTmCam, consists of a set of imagers each with a narrow-band filterthat monitors the brightness of suitable standard stars. Each narrowband filteris selected to monitor a different wavelength region of the atmospherictransmission, including regions dominated by the precipitable water absorptionand aerosol scattering. We have built a prototype system to test the notionthat an atmospheric model derived from a few color indices measurements can bean accurate representation of the true atmospheric transmission. We havemeasured the atmospheric transmission with both narrowband photometricmeasurements and spec- troscopic measurements; we show that the narrowbandimaging approach can predict the changes in the throughput of the atmosphere tobetter than ~10% across a broad wavelength range, so as to achieve photometricprecision less than 0.01 mag.

aTmcam: A Simple Atmospheric Transmission Monitoring Camera For Sub 1% Photometric Precision