A Multifaceted Instrument with Outstanding Image Capabilities

The Near Infrared Camera and Multi-Object Spectrometer (NICMOS) provides imaging capabilities in broad, medium, and narrow band filters, broad-band imaging polarimetry, coronographic imaging, and slitless grism spectroscopy, in the wavelength range 0.8-2.5 microns. NICMOS has three adjacent but not contiguous cameras, designed to operate independently, each with a dedicated array at a different magnification scale. NICMOS was installed during Servicing Mission 2. It was operational from 1997 to 1999 and from 2002 until 2008. NICMOS data can be found on the MAST Archive.

Instrument and Data Handbooks

ISRs

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Listing Results

Results: 3

NICMOS ISR 2010-001: Finesky – Removing Higher Order Sky Residuals

July 06, 2010T. Dahlen, D. Grumm

NICMOS ISR 2009-007: CalTempFromBias: Implementation and Testing

July 21, 2009N. Pirzkal

NICMOS ISR 2009-008: NICMOS Breathing and Focus Field Variations

July 06, 2009T. Wiklind

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Additional Instrument Information

NICMOS is an axial bay instrument which replaced the Faint Object Spectrograph (FOS) in the HST aft shroud during the Second HST Servicing Mission in February 1997. Its enclosure contains four major elements: a graphite epoxy bench, the dewar, the fore-optics bench, and the electronics boxes. The large bench serves to establish the alignment and dimensional stability between the HST optics (via the latches or fittings), the room temperature fore optics bench, and the cryogenic optics and detectors mounted inside the dewar. The instrument has three adjacent but not contiguous cameras, designed to operate independently and simultaneousely. The NICMOS dewar was designed to use solid nitrogen as a cryogen. Cold gas vented from the dewar was used to cool the vapor cooled shield (VCS) which provides a cold environment for both the dewar and the transmissive optical elements (i.e., the filters, polarizers, and grisms). The VCS is itself enclosed within two layers of thermal-electrically cooled shells (TECs). The dewar was built with a design lifetime of approximately 4.5 ± 0.5 years. However, the thermal short developed by NICMOS after installation on HST caused Camera 3 to be no longer parfocal with the other two cameras (Camera 1 and 2 are still close to parfocality); thus, operating Camera 3 simultaneousely with the other two cameras is not scientifically viable as a re-focussing of the instrument is involved. View a schematic of the NICMOS instrument.

The external plumbing at the dewar aft end, which was used for the periodical recooling of the solid nitrogen during ground testing, will now form the interface to the NICMOS Cooling System (NCS). During SM3B, the NCS was connected to the bayonet fittings of the NICMOS interface plate. This allows the NCS to circulate cryogenic Neon gas through the cooling coils in the dewar, thus providing the cooling power to bring the instrument into the temperature range required for operation.

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https://hsthelp.stsci.edu.