Inner disc and circumplanetary material in the PDS 70 system: Insights from multi-epoch, multi-frequency ALMA observations

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Table 5

c_smm astrometry.

Dataset	ΔRA	ΔDec	ΔRA	ΔDec	ΔRA	ΔDec
	Predicted		Measured		Displacement
	[mas]	[mas]	[mas]	[mas]	[mas]	[mas]
2019	−214.8 ± 0.3	31.8 ± 0.4	−227 ± 9	59 ± 9	0	0
2021	−212.1 ± 0.6	14.1 ± 0.7	−217 ± 12	25 ± 12	10 ± 15	−34 ± 15
2023	−209.7 ± 1.1	−1.3 ± 1.0	−215 ± 12	17 ± 12	12 ± 15	−42 ± 15

Notes. The offset, ΔRA, was computed as ΔRA cos (Dec), accounting for the world co-ordinate system (WCS) projection. In the last two columns we show the components of the relative astrometric displacement with respect to the measured position of the 2019 dataset.

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