Extracting Spectral Information about 253 Mathilde Using the NEAR Photometry

Details Extracting Spectral Information about 253 Mathilde Using the NEAR Photometry Extracting Spectral Information about 253 Mathilde Using the NEAR Photometry

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997icar..129..440v&link_type=abstract

Icarus, Volume 129, Issue 2, pp. 440-449.

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Scientific paper

The Near Earth Asteroid Rendezvous (NEAR) spacecraft will conduct the first photometric imagery of a C-class asteroid when it flies by 253 Mathilde. An absorption feature seen in ground-based disk-integrated spectra of many C-class asteroids has been attributed to oxidized iron in phyllosilicate minerals of the serpento-chlorite groups. We have designed a method of identifying this absorption feature in the NEAR photometry of Mathilde. A linear mixing model was used to combine two sets of synthetic NEAR photometry created from a spectrum of Mathilde that does not show this feature and the average of nine spectra of other C-class asteroids each having the 0.7-μm absorption feature. We find that a spatial unit must contain a minimum of 55% material that has a spectrum showing the 0.7-μm absorption feature for the presence of this material to be spectrally detectable in the NEAR photometric imaging data.

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