Updated Nearby Galaxy Catalog ( =UNGC ) contains the most comprehensive summary of distances , radial velocities and luminosities for eight hundred galaxies located within 11 Mpc from us .
The highest density of observables in UNGC makes this sample indispensable for checking results of N-body simulations of cosmic structures on a \sim 1 Mpc scale .

Environment of each galaxy in UNGC was characterized by a tidal index \Theta _ { 1 } depending on the separation and mass of the galaxy ’ s Main Disturber ( =MD ) .
We ascribed the UNGC galaxies with a common MD to its suite , and ranked suite members according to their \Theta _ { 1 } .
All suite members with positive \Theta _ { 1 } are assumed to be physical companions of the MD .
About 58 % of the sample are members of physical groups .

The distribution of suites by the number of members , n , follows to a relation N ( n ) \sim n ^ { -2 } .
The twenty most populated suites contain 468 galaxies , i.e .
59 % of the UNGC sample .
The fraction of MDs among the brightest galaxies is almost 100 % and drops to 50 % at M _ { B } = -18 ^ { m } .

We discuss various properties of MDs , as well as galaxies belonging to their suites .
The suite abundance practically does not depend on morphological type , linear diameter or hydrogen mass of MD , revealing the tightest correlation with the MD dynamical mass .
Dwarf galaxies around MDs exhibit well-known segregation effects : the population of outskirts has later morphological types , richer HI-contents and higher rates of star formation activity .
Nevertheless , there are some intriguing cases when dwarf spheroidal galaxies occur at the far periphery of the suites , as well as some late-type dwarfs residing close to MDs .

Comparing simulation results with galaxy groups , most studies assume the Local Group is fairly typical .
However , we recognize that the nearby groups significantly differ from each other and there is a considerable variation in their properties .
The suites of companions around the Milky Way and M 31 , consisting the Local Group , do not look as a quite typical nearby group .

The multiplicity of nearby groups on number of their physical members can be described by the Hirsh-like index h _ { g } = 9 , indicating that the Local Volume contains 9 groups with populations exceeding 9 companions to their MDs .