Proton N-4 Satellite Bus
Data current as of 2026-07-20.
The Proton N-4 bus accounts for 3 cataloged objects, of which 0 are in orbit and 0 are active. 3 have reentered. Most are built by OKB1. The largest operator on this bus is OKB1. The first launched in 1965, the most recent in 1966.
0
In orbit
0
Active
3
Total launched
3
Reentered
Proton N-4 launched per year
Still in orbit Since reentered Click a year to list its satellites.
Typical specifications
Most common values across cataloged Proton N-4 satellites.
| Manufacturer | OKB1 |
|---|---|
| Launch mass | 8300 kg |
| Dry mass | 8300 kg |
| Length | 4 m |
| Diameter | 4.1 m |
| Span | 9 m |
| Shape | Cyl + 4 Pan |
Top operators
OKB1 2 TSKBEM 1
Top countries
SU 3
Proton N-4 satellites
Track any of them live in KeepTrack.
Frequently asked questions
How many Proton N-4 satellites are there?
The catalog lists 3 objects built on the Proton N-4 bus. 0 are in orbit and 3 have reentered.
How many Proton N-4 satellites are in orbit?
0 Proton N-4 objects are currently in orbit, of which 0 carry an active status.
Who builds the Proton N-4 bus?
The Proton N-4 bus is most commonly built by OKB1.
When did the first Proton N-4 satellite launch?
The first cataloged Proton N-4 satellite launched in 1965, and the most recent in 1966.