What objects are in the internal catalog?
This is the major difference between models. All have a few dozen named stars, used especially for initial alignment. Some have the planets. The Lumicon models have a catalog of planetary nebulae, which is Dr. Jack Marling’s specialty. The NGC-MAX version 3.94 (July, 1992) has the planets;28 user defined objects; the Messier catalog (including M40 and M110); the full NGC,including the so-called “non-existent” objects; about half of the IC catalog; a catalog of 951 interesting stars (multiple, red, variable);and a list of 367 additional deep-sky objects, many of which are very faint. For each object, the catalog has the position, magnitude, size (diameter or separation), constellation, name (if any) and/or catalog number, and the type of object. Some have a word or two of description. This probably varies with the brand and model.
