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Observations with the adaptive optics system on the Very Large Telescopereveal that outer main belt asteroid (702) Alauda has a small satellite withprimary to secondary diameter ratio of $\sim$56. The secondary revolves aroundthe primary in 4.9143 $\pm$ 0.007 days at a distance of 1227 $\pm$ 24 km,yielding a total system mass of (6.057 $\pm$ 0.36) $\times$ 10$^{18}$ kg.Combined with an IRAS size measurement, our data yield a bulk density for thisB-type asteroid of 1570 $\pm$ 500 kg~m$^{-3}$.

Mass and density of B-type asteroid (702) Alauda