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Table 2

Astrometry of PDS 70 b and c relative to the central star.

  MJD
(days)
ΔRA
(mas)
σΔRA
(mas)
ΔDec
(mas)
σ ΔDec
(mas)
ρ

b 59631.28 111.14 1.0 -115.78 0.83 –0.58
c 59222.34 –212.88 0.52 19.32 0.24 0.25
c 59301.24 –212.88 0.08 17.85 0.14 –0.20
c 59302.25 –212.83 0.13 17.67 0.10 –0.97
c 59307.23 –212.88 0.16 17.55 0.23 –0.91
c 59363.10 –212.58 0.15 16.27 0.15 –0.69
c 59365.03 –212.32 0.13 16.15 0.11 –0.21
c 59631.28 –211.75 0.53 10.04 0.37 –0.85

Notes. A correlation coefficient (ρ) is necessary to describe the alignment of the uncertainties of these interferometric observations with the on-sky coordinates. The covariance matrix can be reconstructed with σΔRA2$\sigma _{\Delta {\rm{RA}}}^2$ and σΔDec2$\sigma _{\Delta {\rm{Dec}}}^2$ on the diagonal, and ρσΔRAσΔDec$\rho {\sigma _{\Delta {\rm{RA}}}}{\sigma _{\Delta {\rm{Dec}}}}$ on the off-diagonal.

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