Instrument Information
IDENTIFIER urn:nasa:pds:context:instrument:vsp.lcross::1.1
NAME VISIBLE SPECTROMETER
TYPE SPECTROMETER
DESCRIPTION The LCROSS Visible Spectrometer (VSP) is designed to measure visible (263-650 nm) emission and reflectance spectrometry of the vapor plume and ejecta cloud resulting from the Centaur impact, measure the grain properties, and measure the emission water vapor dissociation and OH- (308 nm) and H2O+ (619 nm) flourescence. The instrument comprises a dual-scope fore-optic system (shared with the NSP1) providing a 1 degree diameter field of view using a 75 cm, 600-micron core diameter UV/Vis glass optical fiber (NA=0.12+/-0.02) feeding an entrance slit (25 x 1000 microns) to a 1-inch f/4 optical cross Czerny-Turner spectrometer (grating 600 lines/mm, blazed at 350 nm). The spectrum, roughly 263-650 nm, is imaged onto a 1044x64 pixel CCD detector, cooled by a thermal electric cooler, where the data is co-added to give a 16-bit, 1 x 1044 pixel spectra. With the cooler off the power draw is 4.8 W, with a maximum of 11.8 W with the cooler on. Configurable integration time is 8 ms to 65.5 s. The instrument is mounted on the inboard side of the LCROSS R6 radiator panel with its aperture pointing in the +X spacecraft direction.
MODEL IDENTIFIER
NAIF INSTRUMENT IDENTIFIER
SERIAL NUMBER not applicable
REFERENCES unk