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Gaia Data Release 2
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Table 4

Summary of estimated systematics for faint sources (G ≳ 16 mag).

Angular scale Parallax Proper motion Remark Reference
[μas] [μas yr−1]
global − 29 10 offset (zero point or spin) Fig. 6 and Gaia Collaboration (2018b)
~90 deg 5 13 RMS value Fig. 7 and Gaia Collaboration (2018b)
~14–20 deg 17 28 RMS value Eqs. (16) and (18)
<1 deg 43 66 RMS value Figs. 14 and 15

Notes. Columns 2 and 3 give the estimated offset or RMS level of systematics in parallax and proper motion (per component) based on the analysis described in the reference. The RMS values should be interpreted as the noise floor when averaging many sources at the given angular scale. For bright sources (especially G ≲ 13 mag), the systematics may be significantly larger; see for example Fig. 4.

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