Instruments
MSI	NIS	NLR	XGRS	MAG	RS

Multi-Spectral Imager = MSI

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MSI Science Team Images MSI fact sheet (73K PDF) APL Tech Digest (354K PDF)

The Multi-Spectral Imager, designed and built by JHU/APL, provides visible and near-infrared images of the asteroid surface. It incorporates f/3.4 rad-hard refractive optics and an eight-position filter wheel covering the range from 450 to 1100 nm. The filter wheel is designed primarily to discriminate iron-containing silicate minerals, with one broadband filter for low-light imaging and optical navigation. The field-of-view (FOV) of 51.5 mrad × 39.4 mrad (2.95° × 2.26°) is divided into 537 × 244 pixels (162 × 96 mrad), giving a 10 × 16 m resolution at 100 km. The CCD is a frame transfer unit with electronic shuttering (0 to 999 ms), and anti-blooming control. At 12-bits per pixel, an uncompressed image is 1.6 Mbits. Using a dedicated high speed link to the Solid State Recorders, an image rate of 1 Hz can be sustained. Various forms of data compression are selectable by command, as is automatic exposure control. Using these latter options, or changing the filter between images, will lower the image rate.