Table 2
Sizes and densities of Elektra that are available in the literature as well as our new determination based on combined optical light curves and disk-resolved images from NIRC2 and SPHERE/IFS instruments mounted on W.M. Keck II and VLT/UT3 telescopes, respectively.
| a × b × c | D eq | ρ bulk | Method | Reference |
| [km] | [km] | [g cm-3] | ||
|
|
||||
| 182 ± 12 | Thermal model from IRAS | Tedesco et al. (2004) | ||
| 191 | Mean size from AO image | Marchis et al. (2006) | ||
| 215 ± 15 | 1.3 ± 0.3 | AO images from Keck, VLT and Gemini | Marchis et al. (2008b) | |
| 183.0 ± 2.3 | Thermal model from AKARI | Usui et al. (2011) | ||
| 198.9 ± 4.1 | Thermal model from WISE | Masiero et al. (2011) | ||
| 191 ± 14 | Convex shape + occultation | Ďurech et al. (2011) | ||
| 174.9 ± 25.5 | 2.34 ± 0.34 | Thermal model of Spitzer spectra | Marchis et al. (2012b) | |
| 197 ± 20 | 1.6 ± 0.5 | Thermophysical model of Spitzer spectra | Marchis et al. (2012b) | |
| 189.62 ± 6.81 | 1.84 ± 0.22 | Compilation | Carry (2012) | |
| 161.94 ± 3.82 | Thermal model from WISE 3band | Masiero et al. (2012) | ||
| 185 ± 20 | 1.99 ± 0.66 | Convex shape + Keck AO | Hanuš et al. (2013) | |
| 258 × 203 × 163 | 196 ± 5 | ADAM: LCs + SPHERE, subdivision | This work | |
| 263 × 204 × 165 | 200 ± 5 | ADAM: LCs + all AO, subdivision | This work | |
| 265 × 208 × 163 | 201 ± 5 | ADAM: LCs + all AO, octanoids | This work | |
| 262 × 205 × 164 | 199 ± 7 | 1.60 ± 0.13 | ADAM: multiple models | This work |
Notes. The table gives dimensions along the three main axis, the volume-equivalent diameter Deq, the method/dataset used for the spin state determination, and the reference to the corresponding publication. ADAM shape models of Elektra are reconstructed from disk-integrated optical data and (i) raw SPHERE images (first); (ii) all resolved images using subdivision surfaces shape support (second); and finally (iii) all resolved data using octanoids shape support (last). The bulk density estimate is assuming mass of 6.6 ± 0.4 × 1018 kg from Marchis et al. (2008b).
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