Instruments
MSI	NIS	NLR	XGRS	MAG	RS

Near-Infrared Spectrograph = NIS

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NIS Science Team Data NIS fact sheet (74K PDF) APL Tech Digest (259 PDF)

The Near-IR Spectrograph (NIS) covers a 0.8 to 2.6 micrometer spectral range in 64 bins. This spectral range is achieved by dispersing the spectrum onto passively-cooled Ge and InGaAs line array detectors. The NIS uses a 1 second integration time, and can produce spectra at a 1 Hz rate. A 1-D scan mirror allows the NIS's FOV to be boresighted with the MSI, or scanned more than 1.92 rad (110°) away in 6.98 mrad (0.4°) increments. Mirror scanning combined with spacecraft motion will be used to build up spectral images. A three-position slit mechanism allows two FOV's: 13.3 × 13.3 mrad (0.76° × 0.76°) and 6.63 × 13.3 mrad (0.38° × 0.76°). These provide spot sizes of 0.65 × 1.3 km or 1.3 × 1.3 km from a 100 km distance. The entrance slit can be closed altogether for dark count measurements. The NIS also carries a diffuse gold inflight calibration target that can reflect sunlight into the spectrograph by correctly positioning the spacecraft and the scan mirror. Sensor Systems Group supplies the NIS optics and mechanisms.