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The young sigma Orionis cluster in the Orion Belt is an incomparable site forstudying the formation and evolution of high-mass, solar-like, and low-massstars, brown dwarfs, and substellar objects below the deuterium burning masslimit. The first version of the Mayrit catalogue was a thorough datacompilation of cluster members and candidates, which is regularly used by manyauthors of different disciplines. I show two new applications of the catalogueand advance preliminar results on very wide binarity and the initial massfunction from 18 to 0.035 Msol in sigma Orionis. The making-up of a new versionof the Mayrit catalogue with additional useful data is in progress.

Stars and brown dwarfs, spatial distribution, multiplicity, X-rays, discs, and the complete mass function of the sigma Orionis cluster