The 90000 stars Supplement to the PPM Catalogue
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Since its appearance in 1966, the SAO Catalogue (SAO, 1966) has been the primary source for stellar positions and proper motions. Typical values for the rms errors are 1 arcsec...
自1966年问世以来，SAO星表（SAO Catalogue，1966）始终是恒星位置与恒星自行的首要参考数据源。其均方根误差的典型值为1角秒（arcsec）……
