Table 1
Rotational states of Elektra 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.
| λ1 | β1 | λ2 | β2 | P | Method | Original model |
| [deg] | [deg] | [deg] | [deg] | [h] | published by | |
|
|
||||||
| 190 | −81 | 5.22468 | E | Drummond et al. (1988) | ||
| 180 | −85 | 240 | −40 | 5.22466 | E | Magnusson (1990) |
| 190 | −81 | 5.224683 | E | Drummond et al. (1991) | ||
| 246 | −32 | 344 | −86 | 5.22466 | E | Michalowski (1993) |
| 192 | −83 | 5.22468 | E | De Angelis (1995) | ||
| 64 | −88 | 5.224664 | LI | Ďurech et al. (2007) | ||
| 160 | −85 | 5.22466 | LI | Torppa et al. (2008) | ||
| 176 | −89 | 5.224663 | LI | Hanuš et al. (2016) | ||
| 64 | −90 | 5.224663 | ADAM | This work | ||
| 69 | −88 | 5.224663 | ADAM | This work | ||
| 71 | −88 | 5.224663 | ADAM | This work | ||
Notes. The table gives ecliptic coordinates λ and β of all possible pole solutions, sidereal rotational period P, method used for the spin state determination (E – methods assuming triaxial rotation ellipsoid shape models, LI – lightcurve inversion with a convex shape approximation, ADAM – shape model based on optical data and disk-resolved images), and 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).
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