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The mean angular momentum associated with the collision of two celestialobjects moving in almost circular heliocentric orbits was studied. The resultsof these studies were used to develop models of the formation of binaries atthe stage of rarefied preplanetesimals. The models can explain a greaterfraction of binaries formed at greater distances from the Sun. Sometimes therecould be two centers of contraction inside the rotating preplanetesimal formedas the result of a collision between two rarefied preplanetesimals. Suchformation of binaries could result in binaries with almost the same masses ofcomponents separated by a large distance. Formation of a disk around theprimary could result because the angular momentum that was obtained by ararefied preplanetesimal formed by collision was greater than the criticalangular momentum for a solid body. One or several satellites of the primarycould be formed from the disk.

Angular momentum of two collided rarefied preplanetesimals and formation of binaries