System satellites, naval intelligence, the U.S. NOSS (Naval Ocean Surveillance system). They move in groups (often of three submutica) at a distance of from 30 to 240 km one from another, and witnesses usually describe as "moving constellations, between which are visible the other stars".
Outbreaks occur if penetrazioni sunlight. Systems of the first and second generation (three submutica) survived in orbit until 2012. Third generation satellites (two submutica) first Boule launched 8 September 2001.
However, this does not mean that now in the sky you can not see the system of three subsatellites. In early 2010, China launched the first NOSS-like triplet, which was almost identical orbital inclination and altitude of the US NOSS.
Translated by «Yandex.Translator»
