Spacecraft information: SL-8 R/B
| Launched | 16 June 1977 |
| Flight ended | 4 February 1980 |
| Status | Decayed |
| Launch site | Kapustin Yar Missile and Space Complex, Russia |
| Owner | Commonwealth of Independent States (former USSR) |
| NORAD ID | 10069 |
| COSPAR ID | 1977-049B |
| Observing |
Launched alongside
SIGNE 3