- Bruno Sampaio Alessi's catalogue of telescopic asterisms and open star clusters Alessi / Teutsch - Bruno S. Alessi's and Philipp Teutsch's catalogue of telescopic asterisms and open star clusters Ali - H. Ali (double stars) Alicante (for example: open star cluster Alicante 1 at 3:59:18 / +57°14'14") Aller - R.M. Aller (double stars) ALS — UBV beta database for Case-Hamburg Northern and Southern Luminous Stars Alter (open star clusters) Alves / Yun (open star clusters) AM - Arp-Madore catalogue of open and globular star clusters (Halton Arp / Barry F. Madore) (for example: Arp-Madore 1 in Horologium, Arp-Madore 2 in Puppis) An - Anderson (double stars) Andrews / Lindsay (AL) (open star clusters) Annis (?) APM — Automatic Plate Measuring machine Apriamashvili (open star clusters) Ara - (for example: Ara 2035 at 7:08.8/-24°03' Canis Major) (see Sky Catalogue 2000.0, Volume 2, page 48) (S.Aravamudan?) Arak / Ark - Marat Arsen Arakelian, 1929-1983 (Arakelian Emission Line Objects) Arce / Goodman (open star clusters) Archinal - probably Brent A. Archinal (for example: open star cluster Archinal 1 at 18:54:49 / +5°32'54") Arg - F.W.A. Argelander (double stars) ARO - Algonquin Radio Observatory Arp — Atlas of Peculiar Galaxies ASCC — N.V. Kharchenko, All-Sky Compiled Catalogue, Kinematika Fiz. Nebesn. Tel., 17, part no 5, 409 (2001) Auner - (for example: open star cluster Auner 1 at 7:04:16 / -19°45'00" in Canis Major) (Auner 1 is the cluster which was "lost" in the disturbing ghost reflection of nearby Alpha Canis Majoris, aka Sirius, this during the Palomar Observatory Sky Survey, POSS) Av - Antalova (open star clusters) Av-Hunter - Aveni / Hunter (open star clusters) AXP - Anomalous X-Ray Pulsar AZ / AzV - Azzopardi-Vigneau B β - S. W. Burnham (double stars) βpm - Burnham's measures of proper motion stars, 1913 catalogue. B - Willem H. van den Bos (double stars) B — E. E. Barnard's List of Dark Nebulae Ba - Barnard (double stars) Ba - Baade (planetary nebulae) BAC — Bordeaux Astrographic Catalog Bail / Bal - R. Baillaud (double stars) Baize / Baz - Paul Baize (Paul Achille-Ariel Baize, 1901-1995) (double stars) Balbinot (open and globular star clusters) (for example: globular star cluster Balbinot 1 in Pegasus) Bar - Barkhatova (open star clusters) (for example: Barkhatova 1, NNW of NGC 7000; the North America Nebula in Cygnus) BAR - E.E.Barton (double stars) Bas - Basel (open star clusters) Bat