Gaia Data Release 2
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Table 3

Fourier coefficients for the basic-angle variations.

Coefficient [μas] Derivative [μas yr−1]
BAM Corr. BAM Corr.
C1 +909.80 +73.34 +1.37
C2 −110.50 −23.38 +1.86 −1.59
C3 −68.39 −4.65 +1.37 −0.33
C4 +17.61 −2.53 −0.79 −1.53
C5 +2.79 −1.15 −0.25 −2.86
C6 +3.67 +1.47 +0.40 −0.18
C7 +0.12 +0.38 −0.34 +0.42
C8 −0.51 −0.44 −0.01 +0.61
S1 +668.41 −25.42 +19.78 +1.49
S2 −90.95 +34.46 −10.68 +5.23
S3 −63.47 +4.63 +3.02 +0.97
S4 +18.11 +3.32 +1.20 −1.33
S5 −0.11 −0.55 +0.79 −1.61
S6 +0.02 −1.11 −0.69 +0.38
S7 +0.18 −0.05 −0.27 −0.14
S8 −0.49 +0.25 +0.09 −0.32

Notes. The columns headed BAM contain the coefficients Ck,0, Sk,0 and derivatives Ck,1, Sk,1 for a harmonic fitto the BAM data according to Eq. (7). The columns headed Corr. contain the corresponding corrections δCk,0, δSk,0, δCk,1, and δSk,1 to the BAM data obtained in the primary astrometric solution using the model in Eq. (10). The reference epoch for the coefficients is J2015.5.

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