The southern V magnitudes have been converted to the system of the northern red magnitudes. The red magnitudes are used to determine the cluster Distance class, discussed below. The Abell cluster number. This procedure was adopted to provide consistency with Abell's northern survey, and also as a matter of expediency. The cluster diameters used on the HyperSky display are based on Distance class, as described in the following table, provided by Dr. Corwin.
Diameters are in minutes of arc.
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