Fig. 2

image

VIRTIS-H spectra of comet 67P obtained at different elevations above the surface. Cube T1_ 00396220410 acquired on 22 July 2015 (rh = 1.27 AU) with a mean elevation H = 1.4 km (red line). Cube T1_00397139303 acquired on 8 August 2015 (rh = 1.25 AU) using selected acquisitions with H = 6.2 km (black line). The phase angle is ~89° for both spectra. The model fits to the continuum are shown in cyan, with derived parameters (Tcol (K), A, (% per 100 nm)) = (295, 0.07, and 2.3) and (289, 0.10, and 2.2) for the spectra on 22 July and 8 August, respectively. The spectra fulfill the quality criterion TEST3.0 < 1.1.

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