Mathematics – Logic
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.1309v&link_type=abstract
American Astronomical Society, DPS meeting #39, #13.09; Bulletin of the American Astronomical Society, Vol. 39, p.434
Mathematics
Logic
Scientific paper
The Japanese Space Agency (JAXA) has identified the near-Earth asteroid 1999 JU3 as the primary target for its next asteroid sample return mission. The proposed mission time schedule is presented in Abe et al. (LPSC XXXVIII 1638, 2007), with launch expected in 2010. One of the objectives of this mission is to visit a primordial asteroid. VNIR spectra of 1999 JU3 were obtained as part of the SMASSII database (http//smass.mit.edu), and it was classified as a Cg asteroid. New VNIR spectra of 1999 JU3 were obtained using the MMT 6.5-m telescope with the facility Red Channel Spectrograph and the new deep depletion CCD on UT 11 July 2007 (dispersion 7.7 Ang/element). This spectrum shows that the asteroid has an absorption feature centered near 0.7 um not observed in the previous spectrum. This feature is commonly seen in spectra of CM2 carbonaceous chondrites, terrestrial phyllosilicates, and C-class asteroids. The spectrum supports the presence of phyllosilicates in the asteroid's surface material, and therefore the possibility that 1999 JU3 derives from a parent asteroid affected by the action of aqueous alteration. The presence of this feature in one spectrum, and its absence in another, further supports the possibility that 1999 JU3 derives from a geologic boundary between two areas having different mineralogy on the parent body, or 1999 JU3 could be a contact binary formed from remnants of two different parent bodies having different mineralogies. NEAs with spectra showing the 0.7-um absorption feature are extremely rare (c.f., Vilas, LPSC XXXVII 2033, 2006). The JAXA mission could be an opportunity to study in situ this common spectral attribute of C-class asteroids.
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