Alan Hirshfeld and Roger W. Sinnott

If you're into deep-sky hunting, this is your book. Volume 2 catalogs 15 different classes of celestial objects, including tabular data for 8,000 double and multiple stars of 8th magnitude or brighter; ephemerides and orbits of 500 visual binaries; variables that reach or exceed magnitude 9.0; 750 open clusters; more than 120 globular clusters; nebulae; galaxies; quasars; radio and X-ray sources. Additional tables include the Messier objects, OB star associations, and the Local Group of galaxies.