Abstract
The young σ Orionis cluster in the Orion Belt is an incomparable site for studying the formation and evolution of high-mass, solar-like, and low-mass stars, brown dwarfs, and substellar objects below the deuterium burning mass limit. The first version of the Mayrit catalogue was a thorough data compilation of cluster members and candidates, which is regularly used by many authors of different disciplines. I show a new application of the catalogue and advance preliminary results on very wide binarity in σ Orionis. The making-up of a new version of the Mayrit catalogue with additional useful data is in progress.
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