Table 1.
Comparison of the physical parameters of Psyche of previous works from Viikinkoski et al. (2018) and augmented with the values derived in this study with the ADAM and MPCD methods.
| Parameter | S17 | D18 | V18 | This work, ADAM | This work, MPCD |
|---|---|---|---|---|---|
| D (km) | 226 ± 23 | 223 ± 2 | 226 ± 5 | 224 ± 5 | 222 ± 4 |
| λ (°) | 34 ± 34 | 32 ± 3 | 34 ± 3 | 35 ± 2 | 35 ± 2 |
| β (°) | −7 ± 5 | −8 ± 3 | −9 ± 3 | −9 ± 2 | −10 ± 2 |
| P (h) | 4.195948(1) | 4.195951(2) | 4.195948(1) | 4.195948(1) | 4.195948(1) |
| a (km) | 279 ± 27 | 274 ± 2 | 290 ± 5 | 286 ± 5 | 278 ± 5 (277) |
| b (km) | 232 ± 23 | 231 ± 4 | 245 ± 5 | 240 ± 5 | 232 ± 6 (238) |
| c (km) | 189 ± 19 | 176 ± 3 | 170 ± 8 | 172 ± 4 | 164 ± 4 (168) |
| a/b | 1.17 ± 0.17 | 1.18 ± 0.02 | 1.18 ± 0.03 | 1.19 ± 0.03 | 1.20 ± 0.04 (1.16) |
| b/c | 1.21 ± 0.17 | 1.31 ± 0.03 | 1.44 ± 0.07 | 1.40 ± 0.04 | 1.41 ± 0.05 (1.42) |
| a/c | 1.50 ± 0.17 | 1.56 ± 0.02 | 1.71 ± 0.07 | 1.66 ± 0.04 | 1.70 ± 0.06 (1.69) |
| m (1018 kg) | 27.2 ± 7.5 | 24.3 ± 3.5 | 24.1 ± 3.2 | 24.1 ± 3.2 | 24.1 ± 3.2 |
| ρ (g cm−3) | 4.5 ± 1.4 | 4.16 ± 0.64 | 3.99 ± 0.61 | 4.10 ± 0.61 | 4.20 ± 0.60 |
| χ2 | 167 | 94 | 54 | 43 | |
Notes. Listed parameters are the volume equivalent-diameter D, the dimensions along the major axes (a, b, c), the sidereal period P, the pole ecliptic longitude λ and latitude β, the mass m, and the bulk density ρ with uncertainties reported at 1σ. The dimensions of the best-fit ellipsoid (see Sect. 4.3) are indicated between parentheses in the MPCD column. The χ2 computed with OASIS from our set of SPHERE images is also indicated when possible. References. S17: Shepard et al. (2017), D18: Drummond et al. (2018), V18: Viikinkoski et al. (2018).
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