NEMESIS catalogue of YSOs in Orion

This trend has led to a growing need for a comprehensive database of young stellar objects (YSOs) that goes beyond survey-specific biases and can be employed for training, validating, and refining the physical interpretation of machine learning outcomes. We aim to review the literature focussed on the Orion star formation complex (OSFC) to compile a thorough catalogue of previously identified YSO candidates in the region, including the curation of observables relevant to probing their youth.

Starting from the NASA/ADS database, the catalogue was assembled from more than 200 peer-reviewed publications targeting the OSFC. We collated data products relevant to the study of young stars into a dedicated catalogue, which was complemented with data from large photometric and spectroscopic surveys as well as the Strasbourg Astronomical Data Center. We also added significant value to the catalogue by homogeneously deriving YSO infrared classification labels, through a comprehensive curation of labels concerning the sources' multiplicity and through the derivation of probabilities of the candidate YSOs in our catalogue being contaminant extragalactic sources or giant stars.