Richness-based masses of rich and famous galaxy clusters
  We present a catalog of galaxy cluster masses derived by exploiting the tight
correlation between mass and richness, i.e., a properly computed number of
bright cluster galaxies. The richness definition adopted in this work is
properly calibrated, shows a small scatter with mass, and has a known
evolution, which means that we can estimate accurate ($0.16$ dex) masses more
precisely than by adopting any other richness estimates or X-ray or SZ-based
proxies based on survey data. We measured a few hundred galaxy clusters at
$0.05<z<0.22$ in the low-extinction part of the Sloan Digital Sky Survey
footprint that are in the 2015 catalog of Planck-detected clusters, that have a
known X-ray emission, that are in the Abell catalog, or that are among the most
most cited in the literature. Diagnostic plots and direct images of clusters
are individually inspected and we improved cluster centers and, when needed, we
revised redshifts. Whenever possible, we also checked for indications of
contamination from other clusters on the line of sight, and found ten such
cases. All this information, with the derived cluster mass values, are included
in the distributed value-added cluster catalog of the 275 clusters with a
derived mass larger than $10^{14}$ M$_{\odot}$. A web front-end is available at
http://www.brera.mi.astro.it/$\sim$andreon/famous.html . Finally, in a
technical appendix we illustrate with Planck clusters how to minimize the
sensitivity of comparisons between masses listed in different catalogs to the
specific overlapping of the considered subsamples, a problem recognized
