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Fig. 1


Difference between NIMAv6 and JPL7 in Dec (declination, left) and RA* (right ascension weighted by cosδ, right) over the time interval 2013–2022. Each dot represents the mean residual and the standard deviation of one night of observations. Dark blue points indicate data reduced with the Wide Field Imager catalogue (see text), light blue points show data reduced with Gaia-DR1, and light red points show data reduced with Gaia-DR2. The continuous black line represents the best-fitting curve to these data, whereas the grey shaded area represents the 1σ uncertainty of the NIMAv6 ephemeris (

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