[madbadgalaxyman (Robert)]

The dwarf galaxy population of Abell S805 (alias the IC 4765 cluster)(alias the IC 4765 group) was studied in:
Carrasco et al., (2006), AJ, 132, 1796.

They note that this cluster is also known as Pavo II and LGG 422. Of these two alternative identifications, the LGG catalog of nearby galaxy groups and clusters is still very much in use;
indeed the LGG is, in fact, a sort of de facto standard for naming groups of galaxies.
(the LGG tidied up the "dog's breakfast" of competing catalogues of nearby groups of galaxies, moreover it is not one of those many existing catalogues of galaxy groups in which the mean group size was pared down to two or three galaxies just to make sure that the groups can be analyzed properly for statistical purposes)

Thus, the LGG designation for this cluster should have about the same priority as the Abell designation.

The central galaxy, IC 4765, was observed by Loubser et al., (2008), MNRAS, 391, 1009 .
They were primarily interested in the central stellar velocities and the central Velocity Dispersion of this galaxy.
This was one of the first times anybody has studied this prominent galaxy in any level of detail!

IC 4765 is normally classified as a cD galaxy (an elliptical galaxy with a very extended and extremely faint halo), and it has a blue absolute magnitude of about -22 which is very typical for these objects that usually sit near the centres of galaxy clusters.
However, I doubt that the morphology and radial surface brightness falloff of the outer regions of IC 4765 have ever been studied in any detail, so this classification is only approximate.

cheers,
mad galaxy man