Near Infrared Camera and Multi-Object Spectrometer: Difference between revisions

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The '''Near Infrared Camera and Multi-Object Spectrometer''' ('''NICMOS''') is a [[scientific instrument]] installed on the [[Hubble Space Telescope]] (HST), operating from [[1997]] to [[1999]], and from [[2002]] to the present day.

NICMOS is an spectrometer built by [[Ball Aerospace]] that allows the HST to observe infrared light, with wavelengths between 0.8 and 2.5 microns, providing imaging and spectroscopy capabilities.

NICMOS was installed on Hubble during its second servicing mission in [[1997]], when two previous [[spectrograph]] instruments were replaced by the [[Space Telescope Imaging Spectrograph]].

NICMOS was installed on Hubble during its second servicing mission in [[1997]], when two previous [[spectrograph]] instruments were replaced by the [[Space Telescope Imaging Spectrograph]].

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When conducting infrared measurements, it is necessary to keep the infrared detectors cooled to avoid having infrared interference from the detector's own heat emissions, so the NICMOS was designed to fit inside a cryogenic [[dewar]], cooling the detector with a block of solid nitrogen. When NICMOS was installed in 1997, the dewar contained a 230-pound block of nitrogen ice. However, due to unforseen design problems, the dewar ran out of nitrogen coolant after less than two years, and had to stop operation. However, during Hubble Service Mission 3B in 2002, a [[cryocooler]] was installed on the Hubble that provides additional refrigeration to the NICMOS through a refrigerated neon loop, allowing it to resume observation measurements.