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We present deep imaging observations, orbital dynamics, and dust tail modelanalyses of the double-component asteroid P/2016 J1 (J1-A and J1-B). Theobservations were acquired at the Gran Telescopio Canarias (GTC) and theCanada-France-Hawaii Telescope (CFHT) from mid March to late July, 2016. Astatistical analysis of backward-in-time integrations of the orbits of a largesample of clone objects of P/2016 J1-A and J1-B shows that the minimumseparation between them occurred most likely $\sim$2300 days prior to thecurrent perihelion passage, i.e., during the previous orbit near perihelion.This closest approach was probably linked to a fragmentation event of theirparent body. Monte Carlo dust tail models show that those two components becameactive simultaneously $\sim$250 days before the current perihelion, withcomparable maximum loss rates of $\sim$0.7 kg s$^{-1}$ and $\sim$0.5 kgs$^{-1}$, and total ejected masses of 8$\times$10$^{6}$ kg and6$\times$10$^{6}$ kg for fragments J1-A and J1-B, respectively. In consequence,the fragmentation event and the present dust activity are unrelated. Thesimultaneous activation times of the two components and the fact that theactivity lasted 6 to 9 months or longer, strongly indicate ice sublimation asthe most likely mechanism involved in the dust emission process.

The splitting of double-component active asteroid P/2016 J1 (PANSTARRS)