Surface Properties of (6) Hebe: A Possible Parent Body of Ordinary Chondrites

Details Surface Properties of (6) Hebe: A Possible Parent Body of Ordinary Chondrites Surface Properties of (6) Hebe: A Possible Parent Body of Ordinary Chondrites

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997icar..128..104m&link_type=abstract

Icarus, Volume 128, Issue 1, pp. 104-113.

Computer Science

18

Scientific paper

We report for the first time rotationally resolved spectroscopic observations, as well as new photometric and polarimetric measurements, of the large S-type asteroid (6) Hebe, always at near-equatorial aspects. We have found evidence for only minor variations in Hebe's visible reflectance spectrum over a rotational cycle, comparable to our measurement accuracy (a few percent) and consistent with an undifferentiated silicate assemblage on the surface. We have also confirmed previous results of the existence of small polarization changes, but they are not correlated with the (complex and asymmetric) photometric lightcurve of the asteroid. A plausible interpretation of these data is that Hebe's surface is composed of undifferentiated materials, but presents texture, albedo, and spectral changes possibly related to the occurrence of energetic cratering events. Given the comparatively large size of Hebe, its proximity to resonance-related chaotic zones of the orbital element space (Farinella et al. 1993, Celest. Mech. 56, 287-305, and Icarus 101, 174-187), and its assignment by Gaffey et al. (1993, Icarus 106, 573-602) to the S(IV) taxonomic subclass, our results support the idea that this asteroid may be the source of a significant fraction of the ordinary chondrite meteorites.

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