  Asteroid (130) Elektra belongs to one of the six known triple asteroids in
the main belt, so its mass has been reliably determined. We aim to use all
available disk-resolved images of (130) Elektra obtained by the SPHERE
instrument at VLT and by the Nirc2 of the Keck telescope together with the
disk-integrated photometry to determine its shape model and its size. The
volume can be then used in combination with the known mass to derive the bulk
density of the primary. We apply the All-Data Asteroid Modeling (ADAM)
algorithm to the optical disk-integrated data, 2 disk-resolved images obtained
by the SPHERE instrument and 13 disk-resolved images from the Nirc2 of the Keck
telescope, and derive the shape model and size of Elektra. We present the shape
model, volume-equivalent diameter (199$\pm$7 km) and bulk density
(1.60$\pm$0.13 g cm$^{-3}$) of the C-type asteroid Elektra.
