We present the results of applying a percolation algorithm to the initial release of the Two Micron All Sky Survey Extended Source Catalog, using subsequently measured redshifts for almost all of the galaxies with K=80 to identify groups. We identify known nearby clusters in the catalogs and contrast the groups identified in the two catalogs. We examine and compare the properties of the determined groups and verify that the results are consistent with the UZC-SSRS2 and northern CfA redshift survey group catalogs. The all-sky nature of the catalog will allow the development of a flow-field model based on the density field inferred from the estimated cluster masses.

Cone search capability for table J/ApJ/655/790/groups (Catalog of Groups in the 2MASS Redshift Survey (Low-density-contrast + High-density-contrast, tables 6 and 7 of paper))

Cone search capability for table J/ApJ/655/790/large (Large groups (High-density-contrast groups with >=25members, or Low-density-contrast groups with >=50members, tables 8 and 9 of paper))

Cone search capability for table J/ApJ/655/790/galaxies (Members of the groups (table 10 and 11 of paper))