Table 2
Average physical properties of outer-belt families.
| Asteroid | Vis. slope | Vis. slope | IR slope | Turn-off | Hydrated | 3-micron | MBC | Albedo | PB | PB | LM/PB | Density |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| family | spec. | SDSS | MOVIS | members | members | feature | members | TW | Durda07 | TW | ||
| (%/1000 Å) | (%/1000 Å) | (%/1000 Å) | Nf (Ns) | Nf (Ns) | (shape) | (number) | (km) | (km) | ||||
| Themis | − 0.2 ± 1.6 | 0.5 ± 1.6 | 1.7 ± 1.5 | 11 (21) | 8 (59) | Rounded | 3 | 0.066 ± 0.033 | 286 | 451 | 0.68 | 1.2 |
| Hygiea | 0.3 ± 3.7 | 0.4 ± 2.1 | 1.6 ± 1.8 | 10 (13) | 3 (25) | Ceres/rounded | 0 | 0.068 ± 0.042 | 492 | 442 | 0.88 | 1.5 |
| Veritas | 1.0 ± 1.3 | 1.6 ± 1.5 | 1.3 ± 3.1 | 14 (15) | 13 (17) | – | 0 | 0.068 ± 0.062 | 135 | 177 | 0.88 | – |
| Ursula | 2.8 ± 1.5 | 3.7 ± 3.3 | 2.3 ± 2.0 | 4 (4) | 0 (7) | Rounded | 0 | 0.058 ± 0.063 | 226 | 280 | 0.83 | 0.8 |
| Lixiaohua | 3.0 ± 3.2 | 2.8 ± 1.7 | 1.1 ± 1.5 | 5 (30) | 0 (35) | – | 2 | 0.043 ± 0.081 | 69 | 220 | 0.51 | – |
Notes. We present values for parent-body diameters (PB) obtained in this work (TW) and by Durda et al. (2007) (Durda07) for comparison. The ratio between the diameter of the families’ largest member and that of the parent body (LM/PB) are shown only for diameters obtained in this work. Nf represents the number of objects that present the feature, while Ns is the number of spectra for which the wavelength was appropriate to perform the feature analysis.
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