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Table A.2

Spectrophotometric parameters of Ceres compared to asteroids and cometary nuclei.

Target VR RI H G V(1,1,0) β [mag /°] A geo

Ceres (this work) 0.38 ± 0.01 0.33 ± 0.02 3.14 ± 0.04 a 0.10 ± 0.04 a 3.48 ± 0.03 a 0.036 ± 0.002 a 0.094 ± 0.007
3.04 ± 0.02 b 0.02 ± 0.01 b 3.50 ± 0.01 b 0.0350 ± 0.0004 b
Ceresc 3.24 ± 0.03 0.076 ± 0.004 3.58 ± 0.03 0.038 ± 0.006 0.099 ± 0.003
Ceresd 3.35 ± 0.04 0.12 ± 0.02 (3.69 ± 0.02) (0.037 ± 0.002)
Average C e 0.38 ± 0.05 0.35 ± 0.05 0.07 ± 0.01 0.043 ± 0.001 0.06 ± 0.02
Average S e 0.49 ± 0.05 0.41 ± 0.06 0.24 ± 0.01 0.030 ± 0.001 0.20 ± 0.07
Average M e 0.42 ± 0.04 0.40 ± 0.05 0.20 ± 0.02 0.032 ± 0.001 0.17 ± 0.04
Average E,R e 0.49 ± 0.02 0.024 ± 0.002 0.52 ± 0.03
67P/Churyumov-Gerasimenko f 0.54 ± 0.05∗∗ 0.46 ± 0.04∗∗ −0.09 ± 0.04 0.077 ± 0.002, 0.041 ± 0.001 0.062 ± 0.002
1P/Halleyg 0.41 ± 0.03 0.39 ± 0.06
103P/Hartley 2 h 0.43 ± 0.04 0.39 ± 0.05 0.046 ± 0.002 0.045 ± 0.009
9P/Tempel 1 i 0.50 ± 0.01 0.49 ± 0.02 0.046 ± 0.007 0.051 ± 0.009

Notes.

(a)

Values derived for α < 30°.

(b)

Values derived for the full phase angle range.

(c)

Reddy et al. (2015). Geometric albedo computed from H parameter.

(d)

Lagerkvist & Magnusson (1990). H is an average from values by Lagerkvist & Magnusson (1990). The values in parentheses have been calculated by Reddy et al. (2015) from HG models by Lagerkvist & Magnusson (1990).

(e)

Shevchenko & Lupishko (1998). This value has been derived for E type asteroids alone.

(f)

All values from Ciarniello et al. (2015) except ∗∗ by Tubiana et al. (2011). β values correspond to α< 15° and α > 15°, respectively.

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