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- optical astronomy[remove]4,002
- photometry[remove]4,002
- infrared photometry2,163
- wide-band photometry2,089
- sloan photometry731
- galaxies721
- variable stars496
- open star clusters469
- surveys417
- radial velocity390
- spectroscopy382
- redshifted354
- eclipsing binary stars304
- ccd photometry282
- globular star clusters276
- medium band photometry253
- proper motions220
- multiple stars212
- chemical abundances204
- quasars195