Gaia Data Release 1
Open Access

Fig. C.1


Differences in position and parallax between the primary data set (TGAS) and the Hipparcos catalogue for 86 928 sources: a) difference in right ascension, (αTαH)cosδ; b) difference in declination, δTδH; c) difference in parallax, ϖTϖH. Median differences at epoch J2015.0 are shown in cells of about 3.36 deg2. The position differences have not been corrected for the orientation difference between the Hipparcos reference frame and the reference frame of Gaia DR1. The maps use an Aitoff projection in equatorial (ICRS) coordinates, with origin α = δ = 0 at the centre and α increasing from right to left.

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