Computer Science
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998icar..131...32b&link_type=abstract
Icarus, Volume 131, Issue 1, pp. 32-40.
Computer Science
24
Scientific paper
Spectrophotometric data for the 0.338- to 0.762-μm region on the main-belt M-asteroids 75 Eurydike and 201 Penelope at small phase angles have been obtained. The spectral observations of 201 Penelope were accompanied by photometric observations allowing an assessment of geometric albedo variation of Penelope with rotation. The reflectance spectra of the bodies are shown to have both similar and differing spectral features varying with rotation. The slightly red-sloped reflectance spectra may suggest the presence of an FeNi- or Fe-free component in the asteroid surface material. Common absorption bands in the spectra of Eurydike and Penelope can probably be attributed to pyroxenes (at 0.51 μm) and oxidized or aqueously altered mafic silicates (at 0.62 and 0.7 μm). A specific absorption feature of Penelope at 0.43 μm may be a result of electronic transitions in crystalline lattices of several different minerals present on the surface of the asteroid including some layer silicates. The presumed presence of phyllosilicates on the surface of 201 Penelope is explained as a result of the aqueous alteration of mafic silicates. Probable scenarios for the origin of the asteroids are also discussed. The conclusion is made that in spite of the asteroids' belonging to the M-class they have a considerable silicate component which manifests itself in some similar absorption features. Furthermore, a few of the main orbital elements of the bodies are very close. This permits the supposition that the bodies have a common origin.
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