Zenit-8 (Oblik) [GDK]Zenit-4MKM (Gerakl) similar
Official name COSMOS 957
Alternative name Cosmos-957
Cospar ID 1977-098A
Norad ID 10385
Launch date 1977-09-30
Launch site TTMTR
Launch vehicle Soyuz-U
Country/Organization USSR
Type application Reconnaissance, photo (film return type)
Operator GRU
RCS size UNKNOWN
Decay date 1977-10-13
Shape Sphere + Cyl
Mass (kg) 6243.81
Diameter (m) 2.4
Height (m) 6.49
Span (m^2) 6.49
Lifetime 14 days
Contractors TsSKB
Propulsion 11D82M; S5.120 (maneuver module)
Configuration Zenit bus
Power Batteries

The Zenit-4MKM, also known as Gerakl or 11F692M, was a soviet optical high resolution reconnaissance satellite of the Vostok-based Zenit-family to replace the earlier Zenit-4MK (Germes).

The satellites consisted of the Vostok-based service and reentry modules and featured an additional maneuvering engine, which was jettisoned before reentry. The spherical reentry module returned both the cameras and the film to earth at the end of the mission. The lifetime of the battery powered spacecraft was typically 12 to 14 days.

39 satellites of this type were launched between 1977 and 1980. The return capsules could be reused several times. The were replaced by the dual-use Zenit-6U (Argon) series.

Satellite COSPAR Date LS Launch Vehicle Remarks
COSMOS 927 1977-063A 1977-07-12 PKMTR Soyuz-U
COSMOS 932 1977-069A 1977-07-20 TTMTR Soyuz-U
COSMOS 938 1977-078A 1977-08-24 PKMTR Soyuz-U
COSMOS 953 1977-089A 1977-09-16 PKMTR Soyuz-U
COSMOS 957 1977-098A 1977-09-30 TTMTR Soyuz-U
COSMOS 964 1977-110A 1977-12-04 PKMTR Soyuz-U
COSMOS 969 1977-120A 1977-12-20 PKMTR Soyuz-U
COSMOS 974 1978-001A 1978-01-06 PKMTR Soyuz-U
COSMOS 986 1978-010A 1978-01-24 TTMTR Soyuz-U
COSMOS 987 1978-013A 1978-01-31 PKMTR Soyuz-U
COSMOS 989 1978-017A 1978-02-14 TTMTR Soyuz-U
COSMOS 993 1978-027A 1978-03-10 PKMTR Soyuz-U
COSMOS 999 1978-033A 1978-03-30 TTMTR Soyuz-U
COSMOS 1003 1978-040A 1978-04-20 PKMTR Soyuz-U
COSMOS 1007 1978-048A 1978-05-16 PKMTR Soyuz-U
COSMOS 1021 1978-057A 1978-06-10 TTMTR Soyuz-U
COSMOS 1022 1978-059A 1978-06-12 PKMTR Soyuz-U
COSMOS 1029 1978-082A 1978-08-29 PKMTR Soyuz-U
COSMOS 1031 1978-085A 1978-09-09 PKMTR Soyuz-U
COSMOS 1042 1978-092A 1978-10-06 PKMTR Soyuz-U
COSMOS 1047 1978-104A 1978-11-15 PKMTR Soyuz-U
COSMOS 1049 1978-107A 1978-11-21 PKMTR Soyuz-U
COSMOS 1059 1978-110A 1978-12-07 PKMTR Soyuz-U
COSMOS 1068 1978-123A 1978-12-26 PKMTR Soyuz-U
COSMOS 1071 1979-002A 1979-01-13 PKMTR Soyuz-U
COSMOS 1073 1979-006A 1979-01-30 PKMTR Soyuz-U
COSMOS 1078 1979-016A 1979-02-22 PKMTR Soyuz-U
COSMOS 1080 1979-023A 1979-03-14 PKMTR Soyuz-U
COSMOS 1098 1979-040A 1979-05-15 PKMTR Soyuz-U
COSMOS 1113 1979-064A 1979-07-10 TTMTR Soyuz-U
COSMOS 1117 1979-068A 1979-07-25 PKMTR Soyuz-U
COSMOS 1120 1979-073A 1979-08-11 TTMTR Soyuz-U
COSMOS 1128 1979-081A 1979-09-14 PKMTR Soyuz-U
COSMOS 1148 1979-106A 1979-12-28 PKMTR Soyuz-U
COSMOS 1165 1980-017A 1980-02-21 PKMTR Soyuz-U
COSMOS 1170 1980-025A 1980-04-01 TTMTR Soyuz-U
COSMOS 1173 1980-029A 1980-04-17 TTMTR Soyuz-U
COSMOS 1214 1980-082A 1980-10-10 PKMTR Soyuz-U