For future reference, because there are an awful lot of them and because Jennifer will, I think, appreciate having it, here is a list of Wikipedia pages describing the various deep-sky catalogues:

• List of Messier objects
• List of NGC objects
• Index catalogue (no list)
• Herschel 400 catalogue
• Caldwell catalogue
• List of dark nebulae (i.e., Barnard objects)

(For all of Wikipedia’s faults, it does astronomy relatively well, I think.)

See also the Royal Astronomical Society of Canada’s Finest NGC Objects List, an illustrated guide to the Sharpless catalogue, and, of course, Wikipedia’s list of astronomical catalogues.