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Subject
- optical observation[remove]128
- catalogs81
- astrometry71
- meridian circles31
- proper motions25
- photometry17
- optical astronomy15
- surveys13
- very long baseline interferometry13
- infrared photometry10
- apparent magnitude9
- radio astronomy8
- standard stars8
- radio sources7
- trigonometric parallax7
- interferometry6
- spectroscopy6
- stellar radii6
- galaxies5
- stellar ages5