Please make a donation to support Gunter's Space Page.
Thank you very much for visiting Gunter's Space Page. I hope that this site is useful and informative for you.
If you appreciate the information provided on this site, please consider supporting my work by making a simple and secure donation via PayPal. Please help to run the website and keep everything free of charge. Thank you very much.

Yantar-4K1 (Oktan, 11F693)


The Russian Yantar-4K1 or Oktan series was the second generation of the high resolution film-return variant of the Yantar reconnaissance satellite series.

This series was a minor improvement over the Yantar-2K (Feniks) series, with prolonged lifetime and improved camera system.

These satellites were developed by TsSKB Progress, Samara, and were built at OAO Arsenal, St Petersburg. They consisted of a service module with reignitable propulsion and two solar arrays, a large conical reentry vehicle with the camera and two small spherical reentry vehicles (SpK, Spuskayemaya Kapsula). The launch mass was about 6700 kg. The orbital life time was up to 45 days. They carried the Zhemchug-18 camera system in the main return capsule, which allowed the camera system and the board computer to be reused. The return capsules could be reused up to three times.

The satellites were launched by Soyuz-U from Plesetsk and Baikonur, typically into a 170 km by 350 km orbit with inclinations between 62.8 and 67.2. The typical landing area was near Orenburg.

The Yantar-4K1 series introduced in 1979 and continued until it was phased out in 1983, with the improved gradually Yantar-4K2 (Kobalt) satellites taking over since 1981.

Nation: USSR
Type / Application: Reconnaissance, photo (film return type)
Operator: GRU
Contractors: TsSKB
Equipment: Zhemchug-18 camera
Configuration: Yantar Bus, main reentry module, 2 small reentry capsules
Power: 2 deployable solar arrays, batteries
Lifetime: 45 days
Satellite COSPAR Date LS Launch Vehicle Remarks
Kosmos 1097 (Yantar-4K1 #1, Oktan #1) 1979-037A 27.04.1979 Pl LC-43/3 Soyuz-U
Kosmos 1177 (Yantar-4K1 #2, Oktan #2) 1980-035A 29.04.1980 Pl LC-43/3 Soyuz-U
Kosmos 1218 (Yantar-4K1 #3, Oktan #3) 1980-086A 30.10.1980 Ba LC-31/6 Soyuz-U
Kosmos 1377 (Yantar-4K1 #4, Oktan #4) 1982-057A 08.06.1982 Ba LC-31/6 Soyuz-U
Kosmos 1399 (Yantar-4K1 #5, Oktan #5) 1982-078A 04.08.1982 Ba LC-31/6 Soyuz-U
Kosmos 1424 (Yantar-4K1 #6, Oktan #6) 1982-117A 16.12.1982 Ba LC-31/6 Soyuz-U
Kosmos 1442 (Yantar-4K1 #7, Oktan #7) 1983-012A 25.02.1983 Pl LC-41/1 Soyuz-U
Kosmos 1457 (Yantar-4K1 #8, Oktan #8) 1983-039A 26.04.1983 Ba LC-31/6 Soyuz-U
Kosmos 1466 (Yantar-4K1 #9, Oktan #9) 1983-050A 26.05.1983 Ba LC-31/6 Soyuz-U
Kosmos 1489 (Yantar-4K1 #10, Oktan #10) 1983-083A 10.08.1983 Ba LC-31/6 Soyuz-U
Kosmos 1496 (Yantar-4K1 #11, Oktan #11) 1983-093A 07.09.1983 Pl LC-16/2 Soyuz-U
Kosmos 1511 (Yantar-4K1 #12, Oktan #12) 1983-117A 30.11.1983 Pl LC-41/1 Soyuz-U