Table 6
Hapke parameter values for Ryugu compared with other asteroids and the Moon.
| Object | Type (a) | w | B0 | h | b | c |  |
Reference |
|---|---|---|---|---|---|---|---|---|
| Ryugu | Cb | 0.044 ± 0.008 | 0.98 ± 0.02 | 0.075 ± 0.008 | 0.388 ± 0.01 | n/a | [28°] ± 6° | This study |
| Ceres | C | 0.116 | 1.6 | 0.054 | 0.22 | n/a | 25° | Schröder et al. (2018) |
| Vesta | V | 0.508 | 1.83 | 0.048 | 0.242 | n/a | 17.5° | Li et al. (2013) |
| Gaspra | S | 0.36 ± 0.07 | 1.63 ± 0.07 | 0.06 ± 0.01 | 0.18 ± 0.04 (b) | n/a | 29° ± 2° | Helfenstein et al. (1994) |
| Gaspra | S | 0.63 ± 0.01 | [1.63] | [0.06] | 0.47 ± 0.01 | 1.0 ± 0.01 | 7.5° ± 1° | Domingue et al. (2016) |
| Gaspra | S | 0.39 | [1.63] | [0.06] | 0.034 | n/a | 22° | This study |
| Ida | Sw | 0.218 ± 0.024 | 1.53 ± 0.01 | 0.02 ± 0.005 | 0.33 ± 0.03 (b) | n/a | 18° ± 2° | Helfenstein et al. (1996) |
| Eros | Sw | 0.42 ± 0.01 | 1.00 ± 0.14 | 0.022 ± 0005 | 0.26 ± 0.01 (b) | n/a | 24° ± 2° | Clark et al. (1999) |
| Eros | Sw | 0.43 ± 0.02 | 1 ± 0.02 | 0.022 ± 0.005 | 0.29 ± 0.02 | n/a | 36° ± 5° | Domingue et al. (2002) |
| Eros | Sw | 0.33 ± 0.03 | 1.4 ± 0.1 | 0.010 ± 0.004 | 0.25 ± 0.02 (b) | n/a | 28° ± 3° | Li et al. (2004) |
| Mathilde | Cb | 0.035 ± 0.006 | 3.18 ± 1.0 | 0.074 ± 0.003 | 0.25 ± 0.04 (b) | n/a | 19° ± 5° | Clark et al. (1999) |
| Itokawa | Sq | 0.57 ± 0.05 | 0.98 ± 0.06 | 0.05 ± 0.02 | 0.35 ± 0.04 | 0.56 ± 0.08 | 40° ± 3° | Tatsumi et al. (2018) |
| Steins | Xe | 0.66 ± 0.02 | 0.60 ± 0.05 | 0.027 ± 0.002 | 0.30 ± 0.01 (b) | n/a | 28° ± 2° | Spjuth et al. (2012) |
| Lutetia | Xc | 0.226 | [1.79] | [0.041] | 0.27 (b) | n/a | [25°] | Masoumzadeh & Boehnhardt (2019) |
| 67P/Churyumov-Gerasimenko | - | 0.037 ± 0.002 | 1.95 ± 0.12 | 0.023 ± 0.004 | 0.42 ±0.03 | n/a | 15 | Fornasier et al. (2015) |
| Moon | - | 0.21 | 0.71 | 0.07 | n/a (c) | n/a (c) | 20° | Helfenstein & Veverka (1987) |
| Moon (§) | - | 0.33 | 2.09 | 0.073 | 0.239 (b) | 0.345 (b) | 23.4° | Sato et al. (2014) |
| (highland) | ||||||||
| Moon (§) | - | 0.36 | 2.01 | 0.079 | 0.235 (b) | 0.325 (b) | 23.4° | Sato et al. (2014) |
| (average) | ||||||||
| Moon (§) | - | 0.20 | 2.52 | 0.053 | 0.261 (b) | 0.45 (b) | 23.4° | Sato et al. (2014) |
| (mare) | ||||||||
Notes. They all include the disk-resolved analysis. All other asteroid parameter values are for the v-band equivalent wavelength, with the exception of Steins (630 nm) and Lutetia (649.2 nm). Numbers in brackets were held constant during some portion of the modeling analysis. (a) Taxonomy classification by Bus & Binzel (2002). (b)These b values were converted from the original to correspond to the equations used in this study. (c) The phase function used in this study was a Legendre polynomial. (§)The values listed are estimated from the graphs in Fig. 17 of Sato et al. (2014).
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