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DSO is a freeware astronomical program that should help to plan observations of deep sky objects. The program allows to search for objects in the NGC database by the object
minimum dimension
availability (i.e. its altitude at the particular time and location should be above some minimum)
type (galaxy, globular cluster, nebula etc.)
visibility (log(C0/C)) in particular telescope according to the visibility concept developed by Jose Torres or maximum magnitude
You could also limit search to Messier, Caldwell or Hershell 400 objects
Features:
performs search of NGC objects to be observed
export the resulting list to Memo for further use by Planetarium
calculates visibility for any object and graph the result
