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If you're going to interpret photometric variability in Gaia photometry this paper is probably required reading. When Gaia revisits a target, the instrument is not at the same orientation. In other words, the camera has a variable roll angle relative to the sky. Resolving faint neighbors depends on the roll angle causing supurious periodicities in the resulting measurements

Holl, Fabricius, Portell, et al.
https://arxiv.org/abs/2212.11971
#astronomy #AstroNotable #AstroNotable_Star