Confirmation of the 0.43-mu M Fe(3+) Feature in Low-Albedo Asteroids

Details Confirmation of the 0.43-mu M Fe(3+) Feature in Low-Albedo Asteroids Confirmation of the 0.43-mu M Fe(3+) Feature in Low-Albedo Asteroids

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.1020a&link_type=abstract

American Astronomical Society, DPS meeting #28, #10.20; Bulletin of the American Astronomical Society, Vol. 28, p.1100

Astronomy and Astrophysics

Astronomy

Scientific paper

A weak absorption feature centered at 0.43 mu m and covering the 0.42--0.44- mu m spectral interval was identified in the reflectance spectra of 12 asteroids, 11 of which are classified as C, P, and G (Vilas et al., 1993). Six additional asteroid spectra, including 2 D-class asteroids, did not show the absorption feature. The feature was attributed to the (6) A1 -> (4) A1, (4) E(G) spin-forbidden crystal field transition assigned to ferric iron (Fe(3+) ). In terrestrial samples, this absorption feature is often masked by the ferric oxide IVCT which has its band minimum in the near UV. Jarosite (KFe3(SO4)2(OH)6), a secondary product of the aqueous alteration of iron sulfide minerals such as pyrite, shows a sharp absorption feature at 0.43 mu m. However, no spectra of these asteroids showing the 0.43-mu m feature were obtained on more than one date. We have now obtained spectra of C- and D-class asteroids (and subclasses) on one or more dates covering this spectral region. Those asteroids observed on more than one date were tied to the asteroid's rotational rates and generally provide spatial resolution across the asteroid's surface. Spectra of 7 asteroids presented in the first paper were obtained as part of this study. We confirm the presence of the 0.43-mu m feature in spectra of C-class (and subclass) asteroids, and its absence in D-class asteroids. This work was supported by the NASA Planetary Astronomy program. FV was a visiting astronomer at CTIO, NOAO, and McDonald.

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