Primarily OH observations. Observations of space debris. Operates in twilight on campaign basis. The instrument was not automated so it operated in a campaign mode. Will be returning to Wisconsin.
More information is available here.
The image of the sky is superimposed on the interferometer ring pattern so that each ring corresponds to a different elevation angle on the sky. The detector is a back-thinned CCD, which has good quantum efficiency up to around 900 nm. More information is available here. A back-thinned CCD detector will enable the instrument to make measurements out to around 980 nm. These TEC measurements extend out to the altitudes of GPS satellites, approx.