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Table A.3
Comparison of the main characteristics of the February 2015 and April 2016 flybys.
| Properties | February 2015 | April 2016 |
|---|---|---|
| # NAC images | 91 | 121 |
| Filters used | 24 sequences with F84, F82, F88 | 33 sequences with F84, F82, F88 |
| 2 sequences with all filters | 2 sequences with all filters | |
| Sequences cadence (seconds) | 36–600 | 180–420 |
| Best pixel scale | 0.11 m/pxl | 0.53 m/pxl |
| Phase angle range | 0°–33° | 0°–12° + ~51° + ~60° |
| Phase reddening | S(0°) = 17.9%/100 nm | S(0°) = 17.9%/100 nm |
| parameters | β = 6.52 × 10−4/100 nm/° | β = 6.40 × 10−4/100 nm/° |
| Median pv(0°, 649 nm) | 6.3% ± 0.6% | 6.3% ± 0.6% |
| Max pv(0°, 649 nm) | 10.4% | 16.0%* |
| Peculiar features | Strata heads, | Bright patches, |
| bright patches, | somber boulders | |
| somber boulders | ||
| Investigated surfaces | ||
| Bright patches | Spectral slope (a) > 17%/100 nm | Spectral slope (a) < 10%/100 nm |
| Sombre boulders | Spectral slope (a) > 17%/100 nm | Spectral slope (a) > 17%/100 nm |
| Spectral differences | Slight | Strong |
| (bright/somber features) | ||
| Bright features’ spectral | Average dark terrain | Water-ice rich material |
| behavior similar to | ||
| Favored locations of bright features | None obvious | Bottom of niches and underhangs |
Notes. (a) Spectral slope close to 0° of phase angle. Abridged comparative of the two flybys discussed in Feller et al. (2016) and in the main text.
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