Ceres’ opposition effect observed by the Dawn framing camera

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Table 2

Best-fit parameters of the Hapke models in Fig. 6.

Case	w	B_{S 0}	h_S		b	c		χ²
A	0.087	3.1	0.081	22°	− 0.22	1.00	25°	428
B	0.091	1.8	0.056	0°	− 0.31	1.00	1°	750
C	0.116	1.6	0.054	23°	0.38	− 0.29	25°	165
D	0.100	1.4	0.046	0°	0.38	− 0.62	1°	603

Notes. For cases A and B the single-term Henyey–Greenstein function was used (c = 1), for C and D the double-term version. is the photometric roughness start value provided to the optimization algorithm and χ² is a measure of the goodness-of-fit (lower is better), with 120 degrees of freedom.

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