Using the NEAR Visible/Near IR Filters to Extract Spectral Information About 253 Mathilde

Details Using the NEAR Visible/Near IR Filters to Extract Spectral Information About 253 Mathilde Using the NEAR Visible/Near IR Filters to Extract Spectral Information About 253 Mathilde

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.1012v&link_type=abstract

American Astronomical Society, DPS meeting #28, #10.12; Bulletin of the American Astronomical Society, Vol. 28, p.1098

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Scientific paper

The NEAR spacecraft will fly past 253 Mathilde in June, 1997, conducting the first close observations of a C-class asteroid. Observations currently planned will include images covering 1 or more pixels. Since NEAR's primary target is the S-class asteroid 433 Eros, images will be obtained in broadband filters chosen to maximize the spectral information on an S-class asteroid. Thus, information derived for a C-class asteroid could be limited to identification and quantification of the UV/blue IVCT and the overall flat visible/near IR spectrum. It is possible that information exists in these broadband data that can provide more insight into the surface composition of Mathilde. We modeled the transmission curves of the NEAR filters. Synthetic NEAR filter values of narrowband reflectance spectra of 20 asteroids were created. Ten spectra are of C-class asteroids showing the 0.7-mu m absorption feature attributed to Fe(2+) -> Fe(3+) in oxidized iron in phyllosilicates present in 50% of the existing C-class asteroid spectra. The other ten include asteroids of S, D, C, P and unusual classes, showing a variety of absorption features. An algorithm was designated to differentiate between the NEAR filter photometry of those asteroids having spectra showing the 0.7-mu m feature and those that don't. The Mathilde spectrum of Binzel et al. (1996) does not show the 0.7-mu m feature, however, the slow rotational period of Mathilde suggests that this spectrum sampled only part of the asteroid's surface. Two sets of synthetic NEAR filter photometry values were made from this spectrum and the average of 9 narrowband reflectance spectra of asteroids showing the 0.7-mu m feature. A linear mixing model was used to combine the two sets of filter values. Using our algorithm, we find that a single spectral unit would need to contain at least 20% material having the 0.7-mu m feature in order to be detectable.

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