The N-6 (a.k.a. Proton-2) was an improved version of the N-4 satellite. It was designed to study the interaction of elementary particles with energies in excess of 1012 eV up to 1015 eV. Due to the instrumentation, the N-6 was much heavier than the N-4. Of it's mass of 17 t, 12.5 t were scientific instrumentation, making the N-6 the heaviest scientific satellite up to this date. A second N-6 was never launched.
|Type / Application:||Science|
|Power:||4 deployable fixed solar arrays, batteries|
|Orbit:||248 km × 477 km, 51.55°|
|Proton 4 (Proton-2 1, N-6 #1)||16.11.1968||TB LC-81/24||Proton-K|
|Proton 5 (Proton-2 2, N-6 #2)||cancelled||TB||Proton-K|