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From a set of adaptive optics (AO) observations collected with the W.M. Kecktelescope between August and September 2009, we derived the orbital parametersof the most recently discovered satellites of the large C-type asteroid (93)Minerva. The satellites of Minerva, which are approximately 3 and 4 km indiameter, orbit very close to the primary $\sim$5 & $\sim$8 $\times$ Rp and$\sim$1% & $\sim$2% $\times$ RHill) in a circular manner, sharing commoncharacteristics with most of the triple asteroid systems in the main-belt.Combining these AO observations with lightcurve data collected since 1980 andtwo stellar occultations in 2010 & 2011, we removed the ambiguity of the polesolution of Minerva's primary and showed that it has an almost regular shapewith an equivalent diameter Deq = 154 $\pm$ 6 km in agreement with IRASobservations. The surprisingly high bulk density of 1.75 $\pm$ 0.30 g/cm$\^3$for this C-type asteroid, suggests that this taxonomic class is composed ofasteroids with different compositions, For instance, Minerva could be made ofthe same material as dry CR, CO, and CV meteorites. We discuss possiblescenarios on the origin of the system and conclude that future observations mayshine light on the nature and composition of this fifth known triple main-beltasteroid.

Characteristics and Large Bulk Density of the C-type Main-Belt Triple Asteroid (93) Minerva