Subject
- open star clusters30
- interferometry27
- meridian circles27
- stellar spectral types26
- ccd photometry24
- photographic magnitude24
- proper-motions24
- very long baseline interferometry24
- quasars23
- wide-band photometry22
- globular star clusters21
- milky way galaxy19
- spectroscopy19
- variable stars18
- astrographic catalogs17
- redshifted16
- infrared astronomy15
- ephemerides14
- galaxy clusters13
- stellar distance13
