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Subject
- apparent magnitude40
- photographic magnitude[remove]40
- astrometry24
- catalogs11
- optical astronomy11
- surveys10
- astronomical object identification8
- proper motions8
- astrographic catalogs6
- galaxies5
- photometry5
- finding lists3
- galaxy classification systems3
- open star clusters3
- optical observation3
- photographic photometry3
- two-color diagrams3
- variable stars3
- asteroids2
- galaxy clusters2
