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- 1
- a stars69
- absolute magnitude110
- abundances6
- abundances, [fe/h]1
- accretion63
- active gal. nuclei3
- active galactic nuclei1,052
- am stars14
- ap stars36
- apparent magnitude479
- asteroids230
- asteroseismology43
- astrographic catalogs17
- astrometric data1
- astrometry665
- astronomical models728
- astronomical object identification435
- astronomical reference materials52
- astrophysical masers220
