A NEW MILKY-WAY CONCORDANCE

We describe a new graphical concordance of catalogs of extended object s in the Milky Way, which is useful for making cross-catalog compariso ns and for identifying otherwise unknown objects. The catalogs include d cover Galactic H II regions, reflection nebulae, dark clouds, planet ary nebulae, supernova remnants, and the NGC 2000. The concordance is interactive and uses the SuperMongo plotting package. Besides source p ositions, the concordance gives information about source sizes and dis tances, when they are available. It is thus complementary to other tex t-based catalog information services. It can easily be extended to tre at more catalogs than the 15 currently available.