Table 5: Hipparcos observations of Europa, Titan and Iapetus, and corresponding aspect data. The date of observation is given in TDT with respect to JD 2 440 000.0, the non-conventional and biased magnitude $H_{\rm ac}$ and corresponding precision are given in fields 2 and 3. The distances to the Sun r and to the Hipparcos satellite $\Delta $, the solar phase angle $\alpha $ and the projected orbital phase $\theta $ are given in fields 4 to 7.
$J_r(Q)=v(r,\pi /2)r$

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