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We present observations and models of the dust environment of activatedasteroid P/2013 P5 (PANSTARRS). The object displayed a complex morphologyduring the observations, with the presence of multiple tails. We combined ourown observations, all made with instrumentation attached to the 10.4m GranTelescopio Canarias (GTC) on La Palma, with previously published Hubble SpaceTelescope (HST) images to build a model aimed at fitting all the observations.Altogether, the data cover a full 3-month period of observations which can beexplained by an intermittent dust loss. The most plausible scenario is that ofan asteroid rotating with the spinning axis oriented perpendicular to the orbitplane and loosing mass from the equatorial region, consistent with a rotationalbreak-up. Assuming that the ejection velocity of the particles(v$\sim$0.02-0.05 m s$^{-1}$) corresponds to the escape velocity, the objectdiameter is constrained to $\sim$30-130 m for bulk densities 3000 to 1000 kgm$^{-3}$.

Intermittent dust mass loss from activated asteroid P/2013 P5 (PANSTARRS)