PPMX Catalog of positions and proper motions
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https://b2find.eudat.eu/dataset/31afd6a8-eeba-5181-9fe3-489237cb09f7
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资源简介：
PPM-Extended (PPMX) is a catalogue of 18,088,919 stars containing astrometric and photometric information. Its limiting magnitude is about 15.2 in the GSC photometric system....
