The Japanese Space Agency's Hayabusa II mission is scheduled to rendezvous 2 with and return a sample from the near-Earth asteroid (162173) 1999 JU3. 3Previous visible-wavelength spectra of this object show significant variability 4 across multiple epochs which could be the result of a compositionally hetero-5 geneous surface. We present new visible and near-infrared spectra to demon-6 strate that thermally altered carbonaceous chondrites are plausible compo-7 sitional analogs, however this is a tentative association due to a lack of any 8 prominent absorption features in our data. We have also conducted a series of

In this paper, we calculate the soft-collisional energy loss of heavy quarks traversing the viscous quark-gluon plasma including the effects of a finite relaxation time τπ on the energy loss. We find that the collisional energy loss depends appreciably on τπ. In particular, for typical values of the viscosity-to-entropy ratio, we show that the energy loss obtained using τπ = 0 can be ∼ 10% larger than the one obtained using τπ = 0. Moreover, we find that the energy loss obtained using the kinetic theory expression for τπ is much larger that the one obtained with the τπ derived from the Anti de Sitter/Conformal Field Theory correspondence. Our results may be relevant in the modeling of heavy quark evolution through the quark-gluon plasma.