Abstract
The Near-Infrared Spectrometer (NIS) instrument on the Near-Earth Asteroid Rendezvous (NEAR) spacecraft is designed to map spectral properties of the mission target, the S-type asteroid 433 Eros, at near-infrared wavelengths diagnostic of the composition of minerals forming S asteroids. NIS is a grating spectrometer, in which light is directed by a dichroic beam-splitter onto a 32-element Ge detector (center wavelengths, 816–1486 nm) and a 32-element InGaAs detector (center wavelengths, 1371–2708 nm). Each detector reports a 32-channel spectrum at 12-bit quantization. The field-of-view is selectable using slits with dimensions calibrated at 0.37° × 0.76° (narrow slit) and 0.74° × 0.76° (wide slit). A shutter can be closed for dark current measurements. For the Ge detector, there is an option to command a 10x boost in gain. A scan mirror rotates the field-of-view over a 140° range, and a diffuse gold radiance calibration target is viewable at the sunward edge of the field of regard. Spectra are measured once per second, and up to 16 can be summed onboard. Hyperspectral image cubes are built up by a combination of down-track spacecraft motion and cross-track scanning of the mirror. Instrument software allows execution of data acquisition macros, which include selection of the slit width, number of spectra to sum, gain, mirror scanning, and an option to interleave dark spectra with the shutter closed among asteroid observations. The instrument was extensively characterized by on-ground calibration, and a comprehensive program of in-flight calibration was begun shortly after launch. NIS observations of Eros will largely be coordinated with multicolor imaging from the Multispectral Imager (MSI). NIS will begin observing Eros during approach to the asteroid, and the instrument will map Eros at successively higher spatial resolutions as NEAR's orbit around Eros is lowered incrementally to 25 km altitude. Ultimate products of the investigation will include composition maps of the entire illuminated surface of Eros at spatial resolutions as high as ∼300 m.
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References
Adams, J.: 1974, J. Geophys. Res. 79, 4829–4836.
Allen, C., Morris, R., and McKay, D.: 1994, J. Geophys. Res. 99, 23173–23185.
Bell, J. F., Davis, D. R., Hartmann, W. K., and Gaffey, M. J.: 1989, in R. P. Binzel, T. Gehrels, and M. S. Matthews (eds.), 'Asteroids: The Big Picture', Asteroids II, University of Arizona Press, Tucson, pp. 921–948.
Bruegge, C. J., Stiegman, A. E., Rainen, R. A., and Springsteen, A.W.: 1993, Opt. Eng. 32, 805–814.
Chapman, C. R. and Gaffey, M. J.:1979, in T. Gehrels (ed.), 'Reflectance Spectra for 277 Asteroids', Asteroids, University of Arizona Press, Tucson, pp. 655–687.
Chapman, C., Morrison, D., and Zellner, B.: 1975, Icarus 25, 104-130.
Cheng et al.: 1997a, 'Near-Earth Asteroid Rendezvous: Mission Overview,' JGR Planets, in press.
Cheng et al.: 1997b, Space Sci. Rev., this volume.
Clark, B. E., Fanale, F., and Salisbury, J. W.: 1992, Icarus 97, 288–297.
Clark, R. N., Swayze, G. A., Gallagher, A. J., King, T. V. V., and Calvin, W. M.: 1993, The U.S.G.S. Digital Spectral Library: Version 1: 0.2 to 3.0 um. U.S. Geol. Surv. Open File Report 93–592.
Cloutis, E. and Gaffey, M.: 1991, J. Geophys. Res. 96, 22809–22826.
Cloutis, E., Gaffey, M., Jackowski, T., and Reed, K.: 1986, J. Geophys. Res. 91, 11641–11653.
Fanale, F., Clark, B. E., and Bell, J. B.: 1992, J. Geophys. Res. 97, 20863–20874.
Farquhar, R. W., Dunham, D. W., and McAdams, J. V.: 1995, J. Astron. Sci. 43, 353–372.
Fischer, E. and Pieters, C.: 1994, Icarus 111, 475–488.
Gaffey, M. J., Bell, J. F., and Cruikshank, D. P.: 1989, in R. P. Binzel et al. (eds.), 'Reflectance Spectroscopy and Asteroid Surface Mineralogy', Asteroids II, University Arizona Press, Tucson, pp. 98–127.
Gaffey, S. J., McFadden, L. A., Pieters, C. M., and Nash, D. B.: 1993a, in C. Pieters and P. Englert (eds.), 'Ultraviolet, Visible, and Near-Infrared Reflectance Spectroscopy: Laboratory Spectra of Geologic Materials', Remote Geochemical Analysis: Elemental and Mineralogical Composition, Cambridge University Press, Cambridge, pp. 43–71.
Gaffey, M., Bell, J. F., Brown, R. H., Burbine, T. H., Piatek, J. L., Reed, K. L., and Chaky, D. A.: 1993b, Icarus 106, 573–602.
Gaffey, M. J., Burbine, T. H., and Binzel, R. P.: 1993c, Meteoritics 28, 168–187.
Gehrels, T. and Tedesco, E. F.: 1979, 'Minor Planets and Related Objects. XXVIII. Asteroid Magnitudes and Phase Relations', Astron. J. 84, 1079–1087.
Hawkins, S. E. et al.: 1997, Space Sci. Rev., this volume.
Hunt, G. R. and Salisbury, J. W.: 1970, Mod. Geol. 1, 283–300.
Hunt, G. R., Salisbury, J. W., and Lenhoff, C. J.: 1971, Mod. Geol. 2, 195–205.
Markov, A. M. (ed.): 1962, The Moon: A Russian View, University of Chicago.
McCord, T. B., Adams, J. B., and Johnson, T. V.: 1970, Science 168, 1445–1447.
Morris, R.: 1977, 'Origin and Evolution of the Grain-Size Dependence of the Concentration of Fine-Grained Metal in Lunar Soils: the Maturation of Lunar Soils to a Steady-State Stage', in Proc. Lunar Planet. Sci. Conf. 8th, pp. 3719–3747.
Murchie, S. L. and Pieters, C. M.: 1996, J. Geophys. Res. 101, 2201–2214.
Pieters, C. M. and Englert, P. A. J.: 1993a, Remote Geochemical Analysis: Elemental and Mineralogical Composition, Cambridge University Press, Cambridge.
Pieters, C., Fischer, E., Rode, O., and Basu, A.: 1993b, J. Geophys. Res. 98, 20817–20824.
Pieters, C. M. and McFadden, L. A.: 1994, Ann. Rev. Earth Planetary Sci. 22, 457–497.
Santo, A. G., Lee, S. C., and Gold, R. E.: 1995, J. Astron. Sci. 43, 373–398.
Stiegman, A. E., Bruegge, C. J., and Springsteen, A. W.: 1993, Opt. Eng. 32, 799–804.
Tholen, D. J. and Barucci, M. A.: 1989, in R. P. Binzel, T. Gehrels, and M. S. Matthews (eds.), 'Asteroid Taxonomy', Asteroids II, University of Arizona Press, Tucson, pp. 1139–1150.
Veverka et al.: 1997. 'An Overview of the NEAR Multispectral Imager (MSI)- Near Infrared Spectrometer (NIS) Investigation', JGR Planets, in press.
Wendlandt, W. W. and Hecht, H. G.: 1966, Reflectance Spectroscopy, Wiley, New York, 298 pp.
Wetherill, G. and Chapman, C.: 1988, in J. Kerridge and M. Matthews (eds.), 'Asteroids and Meteorites', Meteorites and the Early Solar System, University of Arizona Press, Tucson, pp. 35–67.
Zellner, B. and Gradie, J.: 1976, Icarus 28, 117–123.
Zellner, B., Tholen, D., and Tedesco, E.:1985, Icarus 61, 355–416.
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Warren, J.W., Peacock, K., Darlington, E.H. et al. Near Infrared Spectrometer for the Near Earth Asteroid Rendezvous Mission. Space Science Reviews 82, 101–167 (1997). https://doi.org/10.1023/A:1005015719887
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DOI: https://doi.org/10.1023/A:1005015719887