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Table 3

Phase reddening coefficients for different small bodies and for different wavelength ranges.

Object Wavelength range γ (10−4 nm−1/°) Y0 (%.(100 nm)−1) References
67P/Churyumov-Gerasimenko 535–882 nm 0.104 ± 0.003 11.3 ± 0.2 Fornasier et al. (2015)
1–2 µm 0.018 Ciarniello et al. (2015)
Bennu 550–860 nm 0.01414 ± 0.00100 −0.130 ± 0.009 Fornasier et al. (2020)
0.55–2.5 µm 0.00440 ± 0.00028 −0.5 ± 0.04 Fornasier et al. (2020)
Phobos 360–990 nm 0.0046 Pajola et al. (2012)
Phobos spectral laboratory analogue (mix. 16) 1.5–2.4 µm 0.019 ± 0.001 −0.08 ± 0.05 This work

Notes. Phase reddening coefficients were determined from a linear fit of the spectral slope values as a function of the phase angle. We note that γ represents the phase reddening coefficient and Y0 the spectral slope at zero phase angle.

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