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Independent Analysis of µ_δ Data of ILS and INDLS Catalogs to Obtain the Spin of the Bright Gaia DR2 Reference Frame

Aleksić, J.; Damljanović, G.; Stojanović, M.

The Gaia DR2 reference frame should be without relative rotation to the quasars (QSOs) and consistent with the International Celestial Reference System (ICRS). For the faint part of DR2 (stars with Gaia magnitude G≥16) that task was done via Gaia's observations of QSOs (G≥17 mag), but the bright DR2 (G≤13 mag) is difficult to validate and it rotat…