end-of-mission Astrometric performance

Sky-average end-of-mission parallax standard error, in μas, as function of Gaia G magnitude for an unreddened G2V star (V-I = 0.75 mag, V-G = 0.16 mag). The upper and lower curves reflect the range resulting from varying the sky position, the V-I colour index, and the bright-star (TDI-gate) observing strategy.