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- infrared photometry[remove]2,163
- optical astronomy[remove]2,163
- photometry2,163
- wide-band photometry1,481
- galaxies343
- open star clusters314
- variable stars282
- surveys215
- sloan photometry200
- spectroscopy195
- ccd photometry187
- radial velocity187
- redshifted179
- eclipsing binary stars178
- supernovae146
- globular star clusters134
- proper motions129
- multiple stars110
- stellar spectral types107
- pre-main sequence stars106