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1. Abbrev. for Astrophysics Data System.
2. Prefix used to designate an object as listed in the New General Catalog of Double Stars , 1932, a catalog of 17 180 double stars in the northern and equatorial skies, between declinations +90° and –30°. The catalog was complied under the direction of the US astronomer Robert G. Aitken (the prefix is short for Aitken's Double Stars).
An expert system.