Gaia Data Release 3
Open Access

Fig. 20.

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Astrometric along-scan bias δη of Eq. (6) as a function of scan angle ψ for a flux ratio f = 0.656 (ΔG = 0.46, mass ratio q = 0.9), and position angle θ = 0°. Left to right: source separation ρ = 100, 200, 300, and 400 mas. Top panels: total bias δη (blue line), and a cosine fit (dashed red line) that will propagate into a position bias. Bottom panels: residuals of the cosine fit (magenta line) that can bias other source parameters.

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