Abell Catalog of Planetary Nebulae
 The Medusa Nebula is one of the planetary nebulae of the Abell Catalog. | |
The Abell Catalog of Planetary Nebulae was created in 1966 by
filter.[4]
See also
References
- doi:10.1086/126815,
As the National Geographic Society-Palomar Observatory Sky Survey1 nears completion, preliminary lists are being compiled of some of the many new objects discovered. These lists include more than seventy new planetary nebulae and about a dozen star clusters that are believed to be globular.
- doi:10.1086/148602,
Among the many new objects discovered on the photographs taken for the National Geographic Society-Palomar Observatory Sky Survey, eighty-six provisionally classed as planetary nebulae are described here. A. G. Wilson first identified about half of these objects; the rest were found by R. G. Harrington, R. Minkowski, and the writer. Since the publication of a preliminary finding list of seventy-three of these nebulae (Abell 1955), several more have been discovered; more reliable positions and other data for all of the nebulae are given here. The present list of eighty-six objects includes two entries in the Index Catalogue that were not there-identified as planetary nebulae, five objects in a list of new planetary nebulae that was subsequently published by Kohoutek (1962b, 1963), and at least one object that is a radio source and thus which may be a supernova remnant. All eighty-six objects are included in this investigation, however, and are described as "planetary nebulae," with cognizance of the fact that one or two of them may be improperly identified.
- ISBN 3-923524-41-2.
The selection of the objects populating this catalogue is mainly based on an observational programme, and a verification programme consisting of spectroscopic observations for all suspected planetary nebulae, assuming that a planetary nebula has a spectral signature which can easy be recognised. For the present catalogue, a list of 1820 objects, each of them called at least once a planetary nebula, have been inspected; 1143 of them have been classified as true or probable planetary nebulae; 347 objects, which status is still unclear, were classified among the "possible" planetary nebulae. Finally, 330 objects have been rejected. Part I: A. Explanation of the catalogue. B. Tables. C. References of papers containing 20 objects or more. D. Finding charts. Part II: The catalogue.
- ^ "The Abell Planetaries".
By "easy" I don't mean easy to see, at least not in a small telescope. (I highly recommend an OIII filter, no matter what size scope you're using.)