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Subject
- absolute magnitude29
- accretion3
- active galactic nuclei279
- apparent magnitude67
- astrometry16
- astronomical models22
- astronomical object identification66
- astronomical reference materials5
- astrophysical masers2
- atomic physics2
- atomic spectroscopy2
- bl lacertae objects57
- black holes11
- catalogs156
- ccd photometry3
- chemical abundances48
- co line emission6
- diffuse molecular clouds1
- effective temperature1
- ephemerides2