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Table 1

Hapke parameters obtained from disk-averaged photometry.

Camera Filter ω g B0 h θ¯$\bar \theta $ (deg) geom. albedo
SRC pan – −0.265 2.283 ± 0.029 0.05728 ± 0.0005 24 –
HRSC Blue 0.064 ± 0.001 −0.304 ± 0.007 2.283 0.05728 24 0.0714
HRSC Green 0.074 ± 0.002 −0.301 ± 0.007 2.283 0.05728 24 0.0816
HRSC Red 0.082 ± 0.003 −0.280 ± 0.015 2.283 0.05728 24 0.0835
HRSC IR 0.091 ± 0.003 −0.263 ± 0.014 2.283 0.05728 24 0.0877
Literature Reference
Phobos clear 0.070 −0.13 4−1+6$4_{ - 1}^{ + 6}$ 0.055 ± 0.025 22 ± 2 Simonelli et al. (1998)
Average C-ast υ-band 0.037 −0.47 1.03 0.025 20 Helfenstein & Veverka (1989)
Mathilde υ-band 0.035 ± 0.006 −0.25 ± 0.04 3.18 ± 1.0 0.074 ± 0.003 19 ± 5 Clark et al. (1999)
Ceres(u) υ-band 0.070 −0.40 1.6 0.06 44 Helfenstein & Veverka (1989), Li et al. (2006)
Ceres(r) υ-band 0.116 −0.22 1.6 0.054 25 Schröder et al. (2018)
Ceres(r) υ-band 0.104 −0.31 1.6 0.06 18.7 Li et al. (2019)
Themis υ-band 0.048 −0.40 1.6 0.060 5 Bowell et al. (1989)
Ryugu υ-band 0.044 −0.39 0.98 0.0.75 28 Tatsumi et al. (2020)
Bennu υ-band 0.043 −0.30 – – 14 Golish et al. (2021)
67P(u) υ-band 0.037 −0.42 1.95 0.023 15 Fornasier et al. (2015)
67P(r) red-band 0.034 −0.42 2.25 0.061 28 Fornasier et al. (2015)
Moon υ-band 0.21 −0.18 2.01 0.07 20 Helfenstein & Veverka (1987)
Mars (plains)(a) r-band 0.48 −0.136 1.0 0.09 0 Johnson et al. (2006a)
Mars (dark rock)(b) r-band 0.53 0.229 0.77 0.5 11 Johnson et al. (2006b)
Mars (soil)(c) r-band 0.72 −0.167 1.0 0.213 2 Johnson et al. (2006b)

Notes. The SRC data were used to constrain the opposition surge of Phobos, and the derived B0 and h parameters were used as fixed values for the modeling of the four HRSC filters. We fixed θ¯$\bar \theta $ to the value obtained from the modeling of disk-resolved observations acquired with the green filter. Photometric parameters for other low-albedo small bodies, the Moon, and Mars are shown for comparison. For Mars, we report a few examples of photometric parameters at 743 nm from the Spirit and Opportunity rovers observations (we note that the B0 parameter was underconstrained by data; see Johnson et al. (2006a,b) for more details). Notations are as follows: (u)results from disk-averaged photometry; (r)results from resolved photometry; (a)plains NW of Endurance (Table 3b in Johnson et al. 2006a); (b)dark rock in Paso Robles 2 (Table 8d in Johnson et al. 2006b); (c)soil in Paso Robles 1 (Table 7c in Johnson et al. 2006b).

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