Abstract
A simplified formula for light-deflection in the quadrupole field of moving massive bodies has been obtained in [1,2,3], which will be applied for Gaia data reduction. So far, in Gaia data reduction it has been assumed that the positions of the giant planets should be computed at the retarded instant of time. The problem of light-deflection due to quadrupole field of moving planets has been re-considered in [4]. According to their solution, the position and velocity of the massive body have to be taken at retarded time. We show that the solution given in [4] coincides with our simplified quadrupole formula obtained in [1,2,3]. This coincidence implies that the positions of giant planets have, in fact, to be taken at retarded time.
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