Text ( visual ) : unmediated Ad astra HIPPARCOS : the European Space Agency's Astrometry Mission : an introduction compiled on behalf of the ESA Hipparcos Project Team by M. A. C. Perryman. -- Noordwijk : European Space Agency , 1985. -- 45 p. ; 30 cm. -- ESA BR-24. -- (BA72972034) ; https://ci.nii.ac.jp/ncid/BA72972034 Author Heading(s): European Space Agency ; Perryman, M. A. C.