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Table 2

Phase reddening coefficients evaluated for Wosret during different observations and those reported in the literature for comet 67P and for other dark small bodies.

Body and conditions Wavelength γ Y0 References
range (nm) (10−4 nm−1 deg−1) (10−4 nm−1)
Comet 67P
Wosret post-perihelion (2016) 525–882 0.0546 ± 0.0042 13.6 ± 0.4 This work
Wosret around perih. (2015) 525–882 0.0396 ± 0.0067 12.7 ± 0.5 This work
North hemisp. pre-perih (2014) 525–882 0.1040 ± 0.0030 11.3 ± 0.2 Fornasier et al. (2015)
North&South hemisph. at perih. (2015) 525–882 0.0410 ± 0.0120 12.8 ± 1.0 Fornasier et al. (2016)
Small region in Imhotep, Ash, Apis (Feb. 2015 Fly-by) 535–743 0.0652 ± 0.0001 17.9 ± 0.1 Feller et al. (2016)
Abydos and surroundings (post-perihelion, 2016) 535–882 0.0486 ± 0.0075 Hoang et al. (2020)
Northern hemisph. pre-perih. (July 2014–Feb. 2015) 1000–2000 0.018 2.3 Ciarniello et al. (2015)
Northern hemisph. pre-perih. (2014) 1100–2000 0.015 ± 0.001 2.0 Longobardo et al. (2017)

D-type asteroids 450–2400 0.05 ± 0.03 Lantz et al. (2017)
(1) Ceres 550–800 0.046 −0.2 Ciarniello et al. (2017)
(101955) Bennu 550–860 0.014 ± 0.001 −1.3 ± 0.1 Fornasier et al. (2020)
(162173) Ryugu 550–860 0.020 ± 0.007 Tatsumi et al. (2020)

Notes. The quantity γ is the phase reddening coefficient; Y0 is the estimated spectral slope at zero phase angle from the linear fit of the data.

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