HDE Charts: positions, proper motions
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This document is intended to serve as a short description of the data files of the catalogue of 88883 stars of the Henry Draper Extension Charts. Detailed explanation of the...
本文旨在对亨利·德雷伯扩展星图（Henry Draper Extension Charts）收录的88883颗恒星的星表数据文件进行简要说明。下文将对……展开详细阐释
