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Multi-Spectral Imager on the Near Earth Asteroid Rendezvous Mission

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Abstract

A multispectral imager has been developed for a rendezvous mission with the near-Earth asteroid, 433 Eros. The Multi-Spectral Imager (MSI) on the Near-Earth Asteroid Rendezvous (NEAR) spacecraft uses a five-element refractive optical telescope, has a field of view of 2.93 × 2.25°, a focal length of 167.35 mm, and has a spatial resolution of 16.1 × 9.5 m at a range of 100 km. The spectral sensitivity of the instrument spans visible to near infrared wavelengths, and was designed to provide insight into the nature and fundamental properties of asteroids and comets. Seven narrow band spectral filters were chosen to provide multicolor imaging and to make comparative studies with previous observations of S asteroids and measurements of the characteristic absorption in Fe minerals near 1 µm. An eighth filter with a much wider spectral passband will be used for optical navigation and for imaging faint objects, down to visual magnitude of +10.5. The camera has a fixed 1 Hz frame rate and the signal intensities are digitized to 12 bits. The detector, a Thomson-CSF TH7866A Charge-Coupled Device, permits electronic shuttering which effectively varies the dynamic range over an additional three orders of magnitude. Communication with the NEAR spacecraft occurs via a MIL-STD-1553 bus interface, and a high speed serial interface permits rapid transmission of images to the spacecraft solid state recorder. Onboard image processing consists of a multi-tiered data compression scheme. The instrument was extensively tested and calibrated prior to launch; some inflight calibrations have already been completed. This paper presents a detailed overview of the Multi-Spectral Imager and its objectives, design, construction, testing and calibration.

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Authors and Affiliations

  1. Applied Physics Laboratory, The Johns Hopkins University, Johns Hopkins Road, Laurel, MD, 20723–6099, U.S.A

    S. Edward Hawkins III, E. Hugo Darlington, Scott L. Murchie, Keith Peacock, Terry J. Harris, Christopher B. Hersman, Michael J. Elko, Daniel T. Prendergast, Benjamin W. Ballard & Robert E. Gold

  2. Cornell University, Space Sciences Building, Ithaca, NY, 14853, U.S.A

    Joseph Veverka

  3. US Geological Survey, 2234 North Gemini Drive, Flagstaff, AZ, 86001, U.S.A

    Mark S. Robinson

Authors
  1. S. Edward Hawkins III
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  2. E. Hugo Darlington
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  3. Scott L. Murchie
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  4. Keith Peacock
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  5. Terry J. Harris
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  6. Christopher B. Hersman
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  7. Michael J. Elko
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  8. Daniel T. Prendergast
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  9. Benjamin W. Ballard
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  10. Robert E. Gold
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  11. Joseph Veverka
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  12. Mark S. Robinson
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Hawkins, S.E., Darlington, E.H., Murchie, S.L. et al. Multi-Spectral Imager on the Near Earth Asteroid Rendezvous Mission. Space Science Reviews 82, 31–100 (1997). https://doi.org/10.1023/A:1005099211710

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