Table 3
Bright spot spectral slope (535–882 nm) as a function of the volumetric abundance and grain size of water ice mixed with 67P dark terrain; delta represents the dust-to-ice mass ratio.
| Water ice vol. ab. | δ | Specslope (gs 10 µm) | Specslope (gs 100 µm) | Specslope (gs 1000 µm) |
|---|---|---|---|---|
| 0.9 | ≈0.2 | 0.56 (0.81) | 0.50 (0.78) | −0.055 (0.46) |
| 0.8 | 0.5 | 0.83 (1.18) | 0.79 (1.16) | 0.40 (0.94) |
| 0.5 | 2 | 1.78 (2.45) | 1.75 (2.44) | 1.52 (2.31) |
| 0.3 | ≈4.7 | 2.95 (4.00) | 2.93 (3.99) | 2.75 (3.89) |
| 0.2 | 8 | 4.11 (5.51) | 4.10 (5.50) | 3.95 (5.42) |
| 0.1 | 18 | 6.66 (8.78) | 6.64 (8.77) | 6.5 (8.71) |
Notes. Values in parentheses are computed over the interval 535–800 nm (see text). The optical properties of the dark terrain (single scattering phase function and single particle phase function) adopted in the modeling are assumed from Ciarniello et al. (2015, 2022) and do not depend on grain size. Three different water ice grain sizes (gs) are simulated: 10, 100, and 1000 µm. For each case volumetric abundances are defined assuming that water ice and dark terrain have the same grain size. For the purpose of this work, the spectral slope is computed at a reference observation geometry with incidence angle = 45°, emergence angle = 45°, and phase angle = 90°.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.