Abell Catalog

Abell Catalog

(ay -bĕl) The standard catalog of rich clusters of galaxies visible from the northern hemisphere. It was published by George Abell in 1958. A supplement for the southern hemisphere was published by Abell and others in 1988.
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For the full Abell catalog, see https://is.gd/ AbellPNeCat.
Only four of the Abell catalog's members have NGC or IC numbers.
Known as the Medusa Nebula, this gem is one of only two planetaries in the Abell catalog with a popular nickname.
This is a nice object and rather small compared to most of the Abell catalog. It lies 20' east-northeast of the 6.4-magnitude orange star SAO 158306 and 8' south-southwest of 9.4-magnitude SAO 158326.
Of the 82 planetaries in the Abell catalog, I successfully observed 79 using the O III filter and found only three beyond my reach.
Most galaxy-cluster studies rely on a 1958 list, the Abell catalog, that owes its existence to painstaking visual inspections of wide-field photographic plates.
Seventy-nine clusters stood out, outnumbering their counterparts in the Abell catalog five to one.