1963 November 5 - Launch Vehicle: UR-200. UR-200 No. 01 FAILURE: Failure. State trials missile test Agency: RVSN. Apogee: 0 km ( mi). First UR-200 test flight. (LKI)

1964 April 11 - 07:05 GMT - Launch Vehicle: UR-200. FAILURE: Failure. State trials missile test Agency: RVSN. Apogee: 70 km (43 mi).

1964 May 15 - 06:56 GMT - Launch Vehicle: UR-200. State trials missile test Agency: RVSN. Apogee: 689 km (428 mi).

1964 May 30 - 04:02 GMT - Launch Vehicle: UR-200. State trials missile test Agency: RVSN. Apogee: 695 km (431 mi).

1964 June 17 - 04:00 GMT - Launch Vehicle: UR-200. State trials missile test Agency: RVSN. Apogee: 694 km (431 mi).

1964 August 1 - 05:54 GMT - Launch Vehicle: UR-200. State trials missile test Agency: RVSN. Apogee: 686 km (426 mi).

1967 October 27 - 02:21 GMT - Launch Vehicle: Tsiklon. Cosmos 185 Mass: 1,400 kg (3,000 lb). Spacecraft: IS-A. Agency: PKO. Perigee: 518 km (321 mi). Apogee: 887 km (551 mi). Inclination: 64.20 deg. Period: 98.80 min. First test of Istrebitel Sputnik. Only tested engine; no target launched. First launch of Tsykon launch vehicle.

1967 December 27 - 11:28 GMT - Launch Vehicle: Tsiklon. Cosmos 198 Mass: 3,800 kg (8,300 lb). Spacecraft: US-A. Agency: MO SSSR. Perigee: 907 km (563 mi). Apogee: 927 km (576 mi). Inclination: 65.10 deg. Period: 103.40 min. Prototype RORSAT hardware using chemical batteries in place of BES-5 nuclear reactor. First satellite to be boosted to 900 km storage orbit.

1968 March 22 - 09:30 GMT - Launch Vehicle: Tsiklon. Cosmos 209 Mass: 3,800 kg (8,300 lb). Spacecraft: US-A. Agency: MO SSSR. Perigee: 876 km (544 mi). Apogee: 927 km (576 mi). Inclination: 65.30 deg. Period: 103.00 min. RORSAT hardware, representative of production hardware, but using chemical batteries in place of BES-5 nuclear reactor.

1968 October 19 - 04:20 GMT - Launch Vehicle: Tsiklon. Cosmos 248 Mass: 1,400 kg (3,000 lb). Spacecraft: IS-P. Agency: PKO. Perigee: 475 km (295 mi). Apogee: 543 km (337 mi). Inclination: 62.30 deg. Period: 94.80 min. ASAT target. Intercepted repeatedly by Cosmos 249 on 20 October; destroyed by Cosmos 252 on 1 November.

1969 January 25 - Launch Vehicle: Tsiklon. FAILURE: Payload propulsion system failed; no orbit. US-A Mass Model Mass: 3,800 kg (8,300 lb). Spacecraft: US-A. Agency: RVSN. Apogee: 100 km (60 mi). RORSAT hardware, representative of production hardware, but using chemical batteries in place of BES-5 nuclear reactor.

1969 August 6 - 05:40 GMT - Launch Vehicle: Tsiklon. Cosmos 291 Mass: 1,400 kg (3,000 lb). Spacecraft: IS-P. Agency: PKO. Perigee: 144 km (89 mi). Apogee: 548 km (340 mi). Inclination: 62.20 deg. Period: 91.40 min. Test of Tsyklon 2 booster; ASAT target mass model. Did not enter typical target orbit due to lack of on-board engine. Simulated launch of ASAT interceptor planned for the next day was cancelled.

1969 December 23 - 09:25 GMT - Launch Vehicle: Tsiklon. Cosmos 316 Mass: 1,400 kg (3,000 lb). Spacecraft: IS-A. Agency: PKO. Perigee: 152 km (94 mi). Apogee: 1,638 km (1,017 mi). Inclination: 49.50 deg. Period: 102.80 min. Test of Tsyklon 2 booster; mass model of ASAT. When the satellite decayed over US Midwest on 28 August 1970, teams of the USAF 1127th Special Group were able to recover six pieces from five locations in Texas, Oklahoma, and Kansas. These showed that the necessary operational systems - translation engines, sensors, weapons systems - were dummied by steel weights. However factory markings on the recovered material proved to the Air Force analysts that they were dealing with an ASAT weapon.

1970 October 3 - 10:26 GMT - Launch Vehicle: Tsiklon. Cosmos 367 Mass: 3,800 kg (8,300 lb). Spacecraft: US-A. Agency: PKO. Perigee: 915 km (568 mi). Apogee: 1,022 km (635 mi). Inclination: 65.30 deg. Period: 104.50 min. Ocean surveillance; probably used chemical batteries.

1970 October 20 - 05:38 GMT - Launch Vehicle: Tsiklon. Cosmos 373 Mass: 650 kg (1,430 lb). Spacecraft: IS-P. Agency: PKO. Perigee: 510 km (310 mi). Apogee: 1,103 km (685 mi). Inclination: 62.90 deg. Period: 101.00 min. ASAT target. Maneuvered twice to provide target for Cosmos 374 and 375 interceptors.

1970 October 23 - 04:42 GMT - Launch Vehicle: Tsiklon. Cosmos 374 Mass: 1,400 kg (3,000 lb). Spacecraft: IS-A. Agency: PKO. Perigee: 531 km (329 mi). Apogee: 1,464 km (909 mi). Inclination: 63.00 deg. Period: 105.10 min. ASAT interceptor. Intercepted Cosmos 374 on second orbit. Blown up on instructions from ground.

1970 October 30 - 02:36 GMT - Launch Vehicle: Tsiklon. Cosmos 375 Mass: 1,400 kg (3,000 lb). Spacecraft: IS-A. Agency: PKO. Perigee: 579 km (359 mi). Apogee: 1,986 km (1,234 mi). Inclination: 62.80 deg. Period: 111.20 min. ASAT interceptor. Intercept on second orbit. Blown up on instructions from ground. Dual launch of interceptors was intended to help ground staff perfect computational methods for quick-response launches when orbital methods of target were not precisely known.

1971 February 25 - 11:11 GMT - Launch Vehicle: Tsiklon. Cosmos 397 Mass: 1,400 kg (3,000 lb). Spacecraft: IS-A. Agency: PKO. Perigee: 572 km (355 mi). Apogee: 2,164 km (1,344 mi). Inclination: 65.70 deg. Period: 113.10 min. ASAT interceptor. Intercept and destruction of target successful on second orbit.

1971 April 1 - 11:29 GMT - Launch Vehicle: Tsiklon. Cosmos 402 Mass: 3,800 kg (8,300 lb). Spacecraft: US-A. Agency: MO SSSR. Perigee: 965 km (599 mi). Apogee: 1,011 km (628 mi). Inclination: 65.00 deg. Period: 104.90 min. Ocean surveillance; probably used chemical batteries.

1971 April 4 - 14:27 GMT - Launch Vehicle: Tsiklon. Cosmos 404 Mass: 1,400 kg (3,000 lb). Spacecraft: IS-A. Agency: PKO. Perigee: 802 km (498 mi). Apogee: 1,010 km (620 mi). Inclination: 65.70 deg. Period: 103.10 min. ASAT interceptor. Conducted an extended test flight to shake out homing system and engine function. Tested new redundant ranging systems. Tested effectiveness of new approach trajectory to target, whereby target was approached from above rather than below. Following completion of tests and verification of system functions via telemetry, spacecraft was commanded to a destructive reentry over the Pacific Ocean.

1971 December 3 - 13:19 GMT - Launch Vehicle: Tsiklon. Cosmos 462 Mass: 1,400 kg (3,000 lb). Spacecraft: IS-A. Agency: PKO. Perigee: 229 km (142 mi). Apogee: 1,800 km (1,100 mi). Inclination: 65.00 deg. Period: 105.40 min. ASAT interceptor. Successfully intercepted and destroyed Cosmos 459 target. This completed state trials test series and in 1972 the Istrebitel Sputnik was adopted as armament for the Soviet Army. Cosmos 462 produced the lowest number of fragments (27) of any of the ASAT's tested.

1971 December 25 - 11:30 GMT - Launch Vehicle: Tsiklon. Cosmos 469 Mass: 3,800 kg (8,300 lb). Spacecraft: US-A. Agency: MO SSSR. Perigee: 948 km (589 mi). Apogee: 1,006 km (625 mi). Inclination: 64.50 deg. Period: 104.60 min. Ocean surveillance; nuclear powered. First RORSAT flight confirmed by Russian source to have had BES-5 nuclear reactor.

1972 August 21 - 10:36 GMT - Launch Vehicle: Tsiklon. Cosmos 516 Mass: 3,800 kg (8,300 lb). Spacecraft: US-A. Agency: MO SSSR. Perigee: 906 km (562 mi). Apogee: 1,038 km (644 mi). Inclination: 64.80 deg. Period: 104.50 min. Ocean surveillance; nuclear powered.

1973 April 25 - Launch Vehicle: Tsiklon. FAILURE: Payload propulsion system failed; no orbit. RORSAT failure Mass: 3,800 kg (8,300 lb). Spacecraft: US-A. Agency: RVSN. Ocean surveillance; nuclear powered. Last launch of original US-A design by Savin's KB. American 'sniffer' aircraft flew over the Pacific after this failure looking for radioisotopes traces in order to characterise the reactor.

1973 December 27 - 20:19 GMT - Launch Vehicle: Tsiklon. Cosmos 626 Mass: 3,800 kg (8,300 lb). Spacecraft: US-A. Agency: MO SSSR. Perigee: 907 km (563 mi). Apogee: 982 km (610 mi). Inclination: 65.40 deg. Period: 103.90 min. Ocean surveillance; nuclear powered. First test of modernised design by KB Arsenal.

1974 May 15 - 07:30 GMT - Launch Vehicle: Tsiklon. Cosmos 651 Mass: 3,800 kg (8,300 lb). Spacecraft: US-A. Agency: MO SSSR. Perigee: 890 km (550 mi). Apogee: 946 km (587 mi). Inclination: 65.00 deg. Period: 103.40 min. Ocean surveillance; nuclear powered.

1974 May 17 - 06:53 GMT - Launch Vehicle: Tsiklon. Cosmos 654 Mass: 3,800 kg (8,300 lb). Spacecraft: US-A. Agency: MO SSSR. Perigee: 924 km (574 mi). Apogee: 1,006 km (625 mi). Inclination: 64.90 deg. Period: 104.40 min. Ocean surveillance; nuclear powered.

1974 December 24 - 11:00 GMT - Launch Vehicle: Tsiklon. Cosmos 699 Mass: 3,000 kg (6,600 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 428 km (265 mi). Apogee: 440 km (270 mi). Inclination: 65.00 deg. Period: 93.30 min. Ocean monitoring; exploded 4/17/75.

1975 April 2 - 11:00 GMT - Launch Vehicle: Tsiklon. Cosmos 723 Mass: 3,800 kg (8,300 lb). Spacecraft: US-A. Agency: MO SSSR. Perigee: 899 km (558 mi). Apogee: 961 km (597 mi). Inclination: 64.70 deg. Period: 103.60 min. Ocean surveillance; nuclear powered.

1975 April 7 - 11:00 GMT - Launch Vehicle: Tsiklon. Cosmos 724 Mass: 3,800 kg (8,300 lb). Spacecraft: US-A. Agency: MO SSSR. Perigee: 852 km (529 mi). Apogee: 943 km (585 mi). Inclination: 65.60 deg. Period: 102.90 min. Ocean surveillance; nuclear powered.

1975 October 25 - Launch Vehicle: Tsiklon. Operational test? Agency: RVSN. Apogee: 1,000 km (600 mi).

1975 October 29 - 11:00 GMT - Launch Vehicle: Tsiklon. Cosmos 777 Mass: 3,000 kg (6,600 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 425 km (264 mi). Apogee: 442 km (274 mi). Inclination: 65.00 deg. Period: 93.30 min. Ocean monitoring; exploded 1/76.

1975 December 12 - 12:45 GMT - Launch Vehicle: Tsiklon. Cosmos 785 Mass: 3,800 kg (8,300 lb). Spacecraft: US-A. Agency: MO SSSR. Perigee: 907 km (563 mi). Apogee: 1,004 km (623 mi). Inclination: 65.10 deg. Period: 104.20 min. Ocean surveillance; nuclear powered; failed immediately after reaching orbit.

1976 February 16 - 08:29 GMT - Launch Vehicle: Tsiklon. Cosmos 804 Mass: 1,400 kg (3,000 lb). Spacecraft: IS-A. Agency: PKO. Perigee: 160 km (90 mi). Apogee: 702 km (436 mi). Inclination: 65.10 deg. Period: 93.10 min. ASAT interceptor. After intercept with target deorbited using on-board engine.

1976 April 13 - 17:16 GMT - Launch Vehicle: Tsiklon. Cosmos 814 Mass: 1,400 kg (3,000 lb). Spacecraft: IS-A. Agency: PKO. Perigee: 118 km (73 mi). Apogee: 480 km (290 mi). Inclination: 65.10 deg. Period: 90.50 min. ASAT interceptor. After intercept with target deorbited using on-board engine.

1976 July 2 - 10:30 GMT - Launch Vehicle: Tsiklon. Cosmos 838 Mass: 3,800 kg (8,300 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 428 km (265 mi). Apogee: 440 km (270 mi). Inclination: 65.10 deg. Period: 93.30 min. Ocean surveillance. Exploded June/July '76.

1976 July 21 - 15:14 GMT - Launch Vehicle: Tsiklon. Cosmos 843 Mass: 1,400 kg (3,000 lb). Spacecraft: IS-A. Agency: MO SSSR. Perigee: 132 km (82 mi). Apogee: 346 km (214 mi). Inclination: 65.10 deg. Period: 89.30 min. ASAT interceptor. Intercepted Cosmos 839. Deorbited after test.

1976 October 17 - 18:06 GMT - Launch Vehicle: Tsiklon. Cosmos 860 Mass: 3,800 kg (8,300 lb). Spacecraft: US-A. Agency: MO SSSR. Perigee: 923 km (573 mi). Apogee: 995 km (618 mi). Inclination: 64.70 deg. Period: 104.30 min. Ocean surveillance; nuclear powered.

1976 October 21 - 16:53 GMT - Launch Vehicle: Tsiklon. Cosmos 861 Mass: 3,800 kg (8,300 lb). Spacecraft: US-A. Agency: MO SSSR. Perigee: 928 km (576 mi). Apogee: 987 km (613 mi). Inclination: 64.90 deg. Period: 104.20 min. Ocean surveillance; nuclear powered.

1976 November 26 - 14:30 GMT - Launch Vehicle: Tsiklon. Cosmos 868 Mass: 1,400 kg (3,000 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 422 km (262 mi). Apogee: 444 km (275 mi). Inclination: 65.00 deg. Period: 93.30 min.

1976 December 27 - 12:05 GMT - Launch Vehicle: Tsiklon. Cosmos 886 Mass: 1,400 kg (3,000 lb). Spacecraft: IS-A. Agency: MO SSSR. Perigee: 593 km (368 mi). Apogee: 2,291 km (1,423 mi). Inclination: 65.80 deg. Period: 114.70 min. ASAT interceptor. Intercepted and destroyed Cosmos 880 target.

1977 May 23 - 12:14 GMT - Launch Vehicle: Tsiklon. Cosmos 910 Mass: 1,400 kg (3,000 lb). Spacecraft: IS-A. Agency: MO SSSR. Perigee: 149 km (92 mi). Apogee: 506 km (314 mi). Inclination: 65.10 deg. Period: 91.00 min. ASAT interceptor. Failed to intercept Cosmos 909. Deorbited using on-board engine.

1977 June 17 - 07:23 GMT - Launch Vehicle: Tsiklon. Cosmos 918 Mass: 1,400 kg (3,000 lb). Spacecraft: IS-A. Agency: MO SSSR. Perigee: 125 km (77 mi). Apogee: 197 km (122 mi). Inclination: 65.10 deg. Period: 87.70 min. ASAT interceptor. Failed to intercept Cosmos 909. Deorbited using on-board engine.

1977 August 24 - 07:07 GMT - Launch Vehicle: Tsiklon. Cosmos 937 Mass: 3,000 kg (6,600 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 424 km (263 mi). Apogee: 444 km (275 mi). Inclination: 65.00 deg. Period: 93.30 min. Ocean monitoring.

1977 September 16 - 14:25 GMT - Launch Vehicle: Tsiklon. Cosmos 952 Mass: 3,800 kg (8,300 lb). Spacecraft: US-A. Agency: MO SSSR. Perigee: 911 km (566 mi). Apogee: 990 km (610 mi). Inclination: 64.90 deg. Period: 104.10 min. Ocean surveillance; nuclear powered.

1977 September 18 - 13:48 GMT - Launch Vehicle: Tsiklon. Cosmos 954 Mass: 3,800 kg (8,300 lb). Spacecraft: US-A. Agency: MO SSSR. Perigee: 251 km (155 mi). Apogee: 265 km (164 mi). Inclination: 65.00 deg. Period: 89.70 min. Ocean surveillance; nuclear powered; re-entered over Canada, spreading radioactive debris.

1977 October 26 - 05:14 GMT - Launch Vehicle: Tsiklon. Cosmos 961 Mass: 1,400 kg (3,000 lb). Spacecraft: IS-A. Agency: MO SSSR. Perigee: 269 km (167 mi). Apogee: 1,421 km (882 mi). Inclination: 66.40 deg. Period: 101.80 min. ASAT interceptor. Succeeded in intercept of Cosmos 959. Deorbited using on-board engine.

1977 December 21 - 10:35 GMT - Launch Vehicle: Tsiklon. Cosmos 970 Mass: 1,400 kg (3,000 lb). Spacecraft: IS-A. Agency: MO SSSR. Perigee: 936 km (581 mi). Apogee: 1,138 km (707 mi). Inclination: 65.90 deg. Period: 105.90 min. ASAT interceptor. Intercepted Cosmos 970 target. Ordered to self-destruct following interception.

1978 May 19 - 00:21 GMT - Launch Vehicle: Tsiklon. Cosmos 1009 Mass: 1,400 kg (3,000 lb). Spacecraft: IS-A. Agency: MO SSSR. Perigee: 966 km (600 mi). Apogee: 1,364 km (847 mi). Inclination: 65.90 deg. Period: 108.60 min. ASAT interceptor. Succeeded in intercept of Cosmos 970. Deorbited using on-board engine.

1979 April 18 - 12:00 GMT - Launch Vehicle: Tsiklon. Cosmos 1094 Mass: 3,000 kg (6,600 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 426 km (264 mi). Apogee: 442 km (274 mi). Inclination: 65.00 deg. Period: 93.30 min. Ocean monitoring.

1979 April 25 - 10:00 GMT - Launch Vehicle: Tsiklon. Cosmos 1096 Mass: 3,000 kg (6,600 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 428 km (265 mi). Apogee: 442 km (274 mi). Inclination: 65.10 deg. Period: 93.30 min. Ocean monitoring.

1980 March 14 - 10:40 GMT - Launch Vehicle: Tsiklon. Cosmos 1167 Mass: 3,000 kg (6,600 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 426 km (264 mi). Apogee: 442 km (274 mi). Inclination: 65.00 deg. Period: 93.30 min. Ocean monitoring.

1980 April 18 - 00:51 GMT - Launch Vehicle: Tsiklon. Cosmos 1174 Mass: 1,400 kg (3,000 lb). Spacecraft: IS-A. Agency: MO SSSR. Perigee: 372 km (231 mi). Apogee: 1,419 km (881 mi). Inclination: 66.10 deg. Period: 102.90 min. ASAT interceptor. First test of ASAT after extended storage. Missed Cosmos 1171 target by a large distance; over the two following days two more attempts were made with the backup engine, but all failed. On 20 April the satellite was ordered to self-destruct in orbit, ending the longest ASAT interceptor mission.

1980 April 29 - 11:40 GMT - Launch Vehicle: Tsiklon. Cosmos 1176 Mass: 3,800 kg (8,300 lb). Spacecraft: US-A. Agency: MO SSSR. Perigee: 873 km (542 mi). Apogee: 962 km (597 mi). Inclination: 64.80 deg. Period: 103.40 min. Ocean surveillance; nuclear powered; test flight of modified safer design.

1980 November 4 - 15:04 GMT - Launch Vehicle: Tsiklon. Cosmos 1220 Mass: 3,000 kg (6,600 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 526 km (326 mi). Apogee: 759 km (471 mi). Inclination: 65.00 deg. Period: 97.60 min. Ocean monitoring.

1981 February 2 - 02:19 GMT - Launch Vehicle: Tsiklon. Cosmos 1243 Mass: 1,400 kg (3,000 lb). Spacecraft: IS-A. Agency: MO SSSR. Perigee: 294 km (182 mi). Apogee: 1,013 km (629 mi). Inclination: 65.80 deg. Period: 97.80 min. ASAT interceptor. Approached within 50 m of target, but explosive charge did not go off as planned. Deorbited to destructive reentry in the atmosphere.

1981 March 5 - 18:09 GMT - Launch Vehicle: Tsiklon. Cosmos 1249 Mass: 3,800 kg (8,300 lb). Spacecraft: US-A. Agency: MO SSSR. Perigee: 904 km (561 mi). Apogee: 976 km (606 mi). Inclination: 65.00 deg. Period: 103.90 min. Ocean surveillance; nuclear powered.

1981 March 14 - 16:55 GMT - Launch Vehicle: Tsiklon. Cosmos 1258 Mass: 1,400 kg (3,000 lb). Spacecraft: IS-A. Agency: MO SSSR. Perigee: 299 km (185 mi). Apogee: 1,022 km (635 mi). Inclination: 65.80 deg. Period: 97.90 min. ASAT interceptor. Failed to intercept Cosmos 1241 target. Deorbited to destructive reentry in the atmosphere.

1981 March 20 - 23:45 GMT - Launch Vehicle: Tsiklon. Cosmos 1260 Mass: 3,000 kg (6,600 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 425 km (264 mi). Apogee: 444 km (275 mi). Inclination: 65.00 deg. Period: 93.30 min. Ocean monitoring.

1981 April 21 - 03:45 GMT - Launch Vehicle: Tsiklon. Cosmos 1266 Mass: 3,800 kg (8,300 lb). Spacecraft: US-A. Agency: MO SSSR. Perigee: 911 km (566 mi). Apogee: 941 km (584 mi). Inclination: 64.80 deg. Period: 103.60 min. Ocean surveillance; nuclear powered.

1981 August 4 - 08:28 GMT - Launch Vehicle: Tsiklon. Cosmos 1286 Mass: 3,000 kg (6,600 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 430 km (260 mi). Apogee: 442 km (274 mi). Inclination: 65.00 deg. Period: 93.20 min. Ocean monitoring.

1981 August 24 - 16:37 GMT - Launch Vehicle: Tsiklon. Cosmos 1299 Mass: 3,800 kg (8,300 lb). Spacecraft: US-A. Agency: RVSN. Perigee: 926 km (575 mi). Apogee: 962 km (597 mi). Inclination: 65.10 deg. Period: 103.90 min. Ocean surveillance; nuclear powered.

1981 September 14 - 20:31 GMT - Launch Vehicle: Tsiklon. Cosmos 1306 Mass: 3,000 kg (6,600 lb). Spacecraft: US-P. Agency: -. Perigee: 168 km (104 mi). Apogee: 424 km (263 mi). Inclination: 65.00 deg. Period: 90.40 min. Ocean monitoring; replaced Cosmos 1260.

1982 February 11 - 01:11 GMT - Launch Vehicle: Tsiklon. Cosmos 1337 Mass: 3,000 kg (6,600 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 426 km (264 mi). Apogee: 444 km (275 mi). Inclination: 65.00 deg. Period: 93.30 min. Ocean monitoring.

1982 April 29 - 09:55 GMT - Launch Vehicle: Tsiklon. Cosmos 1355 Mass: 3,000 kg (6,600 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 277 km (172 mi). Apogee: 295 km (183 mi). Inclination: 65.00 deg. Period: 90.20 min. Ocean monitoring.

1982 May 14 - 19:39 GMT - Launch Vehicle: Tsiklon. Cosmos 1365 Mass: 3,800 kg (8,300 lb). Spacecraft: US-A. Agency: MO SSSR. Perigee: 881 km (547 mi). Apogee: 979 km (608 mi). Inclination: 65.10 deg. Period: 103.60 min. Ocean surveillance; nuclear powered.

1982 June 1 - 13:58 GMT - Launch Vehicle: Tsiklon. Cosmos 1372 Mass: 3,800 kg (8,300 lb). Spacecraft: US-A. Agency: MO SSSR. Perigee: 919 km (571 mi). Apogee: 966 km (600 mi). Inclination: 64.90 deg. Period: 103.90 min. Ocean surveillance; nuclear powered.

1982 June 18 - 11:04 GMT - Launch Vehicle: Tsiklon. Cosmos 1379 Mass: 1,400 kg (3,000 lb). Spacecraft: IS-A. Agency: PKO. Perigee: 144 km (89 mi). Apogee: 546 km (339 mi). Inclination: 65.10 deg. Period: 91.40 min. ASAT interceptor. Succeeded in intercept of Cosmos 1375 target. Deorbited using on-board engine. Final test of series.

1982 August 30 - 10:06 GMT - Launch Vehicle: Tsiklon. Cosmos 1402 Mass: 3,800 kg (8,300 lb). Spacecraft: US-A. Agency: MO SSSR. Perigee: 250 km (150 mi). Apogee: 266 km (165 mi). Inclination: 65.00 deg. Period: 89.60 min. Ocean surveillance; nuclear powered.

1982 September 4 - 17:50 GMT - Launch Vehicle: Tsiklon. Cosmos 1405 Mass: 3,000 kg (6,600 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 425 km (264 mi). Apogee: 443 km (275 mi). Inclination: 65.00 deg. Period: 93.30 min. Ocean monitoring.

1982 October 2 - 00:01 GMT - Launch Vehicle: Tsiklon. Cosmos 1412 Mass: 3,800 kg (8,300 lb). Spacecraft: US-A. Agency: MO SSSR. Perigee: 886 km (550 mi). Apogee: 998 km (620 mi). Inclination: 64.80 deg. Period: 103.90 min. Ocean surveillance; nuclear powered.

1983 May 7 - 10:30 GMT - Launch Vehicle: Tsiklon. Cosmos 1461 Mass: 3,000 kg (6,600 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 574 km (356 mi). Apogee: 803 km (498 mi). Inclination: 65.00 deg. Period: 98.50 min. Ocean monitoring.

1983 October 29 - 08:30 GMT - Launch Vehicle: Tsiklon. Cosmos 1507 Mass: 3,000 kg (6,600 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 298 km (185 mi). Apogee: 325 km (201 mi). Inclination: 65.00 deg. Period: 90.80 min. Ocean monitoring.

1984 May 30 - 18:46 GMT - Launch Vehicle: Tsiklon. Cosmos 1567 Mass: 3,000 kg (6,600 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 353 km (219 mi). Apogee: 369 km (229 mi). Inclination: 65.00 deg. Period: 91.80 min. Ocean monitoring.

1984 June 29 - 00:21 GMT - Launch Vehicle: Tsiklon. Cosmos 1579 Mass: 3,800 kg (8,300 lb). Spacecraft: US-A. Agency: MO SSSR. Perigee: 914 km (567 mi). Apogee: 970 km (600 mi). Inclination: 65.10 deg. Period: 103.90 min. Ocean surveillance; nuclear powered.

1984 August 7 - 22:50 GMT - Launch Vehicle: Tsiklon. Cosmos 1588 Mass: 3,000 kg (6,600 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 331 km (205 mi). Apogee: 347 km (215 mi). Inclination: 65.00 deg. Period: 91.30 min. Ocean monitoring.

1984 October 31 - 12:29 GMT - Launch Vehicle: Tsiklon. Cosmos 1607 Mass: 3,800 kg (8,300 lb). Spacecraft: US-A. Agency: MO SSSR. Perigee: 908 km (564 mi). Apogee: 994 km (617 mi). Inclination: 65.00 deg. Period: 104.10 min. Ocean surveillance; nuclear powered.

1985 January 23 - 19:58 GMT - Launch Vehicle: Tsiklon. Cosmos 1625 Mass: 3,000 kg (6,600 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 118 km (73 mi). Apogee: 390 km (240 mi). Inclination: 65.00 deg. Period: 89.60 min. Ocean monitoring.

1985 April 18 - 21:40 GMT - Launch Vehicle: Tsiklon. Cosmos 1646 Mass: 3,000 kg (6,600 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 378 km (234 mi). Apogee: 399 km (247 mi). Inclination: 65.00 deg. Period: 92.30 min. Ocean monitoring.

1985 August 1 - 05:36 GMT - Launch Vehicle: Tsiklon. Cosmos 1670 Mass: 3,800 kg (8,300 lb). Spacecraft: US-A. Agency: MO SSSR. Perigee: 893 km (554 mi). Apogee: 1,007 km (625 mi). Inclination: 64.90 deg. Period: 104.10 min. Ocean surveillance; nuclear powered.

1985 August 23 - 22:33 GMT - Launch Vehicle: Tsiklon. Cosmos 1677 Mass: 3,800 kg (8,300 lb). Spacecraft: US-A. Agency: MO SSSR. Perigee: 880 km (540 mi). Apogee: 1,001 km (621 mi). Inclination: 64.70 deg. Period: 103.90 min. Ocean surveillance; nuclear powered.

1985 September 19 - 01:32 GMT - Launch Vehicle: Tsiklon. Cosmos 1682 Mass: 3,000 kg (6,600 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 341 km (211 mi). Apogee: 446 km (277 mi). Inclination: 65.00 deg. Period: 92.40 min. Ocean surveillance.

1986 February 27 - 01:44 GMT - Launch Vehicle: Tsiklon. Cosmos 1735 Mass: 3,000 kg (6,600 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 419 km (260 mi). Apogee: 442 km (274 mi). Inclination: 65.00 deg. Period: 93.20 min. Ocean surveillance.

1986 March 21 - 10:05 GMT - Launch Vehicle: Tsiklon. Cosmos 1736 Mass: 3,800 kg (8,300 lb). Spacecraft: US-A. Agency: MO SSSR. Perigee: 936 km (581 mi). Apogee: 995 km (618 mi). Inclination: 65.00 deg. Period: 104.40 min. Ocean surveillance; nuclear powered.

1986 March 25 - 19:26 GMT - Launch Vehicle: Tsiklon. Cosmos 1737 Mass: 3,000 kg (6,600 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 414 km (257 mi). Apogee: 426 km (264 mi). Inclination: 73.40 deg. Period: 93.00 min. Ocean surveillance.

1986 August 4 - 05:08 GMT - Launch Vehicle: Tsiklon. Cosmos 1769 Mass: 3,000 kg (6,600 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 287 km (178 mi). Apogee: 383 km (237 mi). Inclination: 65.00 deg. Period: 91.20 min. Ocean surveillance.

1986 August 20 - 12:58 GMT - Launch Vehicle: Tsiklon. Cosmos 1771 Mass: 3,800 kg (8,300 lb). Spacecraft: US-A. Agency: MO SSSR. Perigee: 909 km (564 mi). Apogee: 1,000 km (600 mi). Inclination: 65.00 deg. Period: 104.20 min. Ocean surveillance; nuclear powered.

1987 February 1 - 23:30 GMT - Launch Vehicle: Tsiklon. Cosmos 1818 Mass: 3,800 kg (8,300 lb). Spacecraft: Plazma-A. Agency: MO SSSR. Perigee: 774 km (480 mi). Apogee: 803 km (498 mi). Inclination: 65.00 deg. Period: 100.60 min. Test of new Topaz reactor, new systems, and ion engines aboard US-AM bus.

1987 April 8 - 03:51 GMT - Launch Vehicle: Tsiklon. Cosmos 1834 Mass: 3,000 kg (6,600 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 402 km (249 mi). Apogee: 415 km (257 mi). Inclination: 65.00 deg. Period: 92.70 min. Ocean surveillance.

1987 June 18 - 21:33 GMT - Launch Vehicle: Tsiklon. Cosmos 1860 Mass: 3,800 kg (8,300 lb). Spacecraft: US-A. Agency: MO SSSR. Perigee: 900 km (550 mi). Apogee: 992 km (616 mi). Inclination: 65.00 deg. Period: 104.00 min. Ocean surveillance; nuclear powered.

1987 July 10 - 15:35 GMT - Launch Vehicle: Tsiklon. Cosmos 1867 Mass: 3,800 kg (8,300 lb). Spacecraft: Plazma-A. Agency: MO SSSR. Perigee: 776 km (482 mi). Apogee: 803 km (498 mi). Inclination: 65.00 deg. Period: 100.70 min. Test of new Topaz reactor, new systems, and ion engines aboard US-AM bus - Tested Plasma-2 SPT electric engine.

1987 October 10 - 21:48 GMT - Launch Vehicle: Tsiklon. Cosmos 1890 Mass: 3,000 kg (6,600 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 402 km (249 mi). Apogee: 415 km (257 mi). Inclination: 65.00 deg. Period: 92.70 min. Ocean surveillance.

1987 December 12 - 05:40 GMT - Launch Vehicle: Tsiklon. Cosmos 1900 Mass: 3,800 kg (8,300 lb). Spacecraft: US-A. Agency: MO SSSR. Perigee: 696 km (432 mi). Apogee: 735 km (456 mi). Inclination: 66.10 deg. Period: 99.10 min. Ocean surveillance; nuclear powered.

1988 March 14 - 14:21 GMT - Launch Vehicle: Tsiklon. Cosmos 1932 Mass: 3,800 kg (8,300 lb). Spacecraft: US-A. Agency: MO SSSR. Perigee: 920 km (570 mi). Apogee: 1,008 km (626 mi). Inclination: 65.10 deg. Period: 104.40 min. Ocean surveillance; nuclear powered - last launch of the US-AM. Programme cancelled by Gorbachev.

1988 May 28 - 02:49 GMT - Launch Vehicle: Tsiklon. Cosmos 1949 Mass: 3,000 kg (6,600 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 402 km (249 mi). Apogee: 415 km (257 mi). Inclination: 65.00 deg. Period: 92.70 min. Ocean surveillance.

1988 November 18 - 00:12 GMT - Launch Vehicle: Tsiklon. Cosmos 1979 Mass: 3,000 kg (6,600 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 402 km (249 mi). Apogee: 415 km (257 mi). Inclination: 65.00 deg. Period: 92.70 min. Ocean surveillance.

1989 July 24 - 00:00 GMT - Launch Vehicle: Tsiklon. Cosmos 2033 Mass: 3,000 kg (6,600 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 196 km (121 mi). Apogee: 322 km (200 mi). Inclination: 65.00 deg. Period: 89.70 min. Ocean surveillance.

1989 September 27 - 16:20 GMT - Launch Vehicle: Tsiklon. Cosmos 2046 Mass: 3,000 kg (6,600 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 402 km (249 mi). Apogee: 415 km (257 mi). Inclination: 65.00 deg. Period: 92.70 min. Ocean surveillance.

1989 November 24 - 23:22 GMT - Launch Vehicle: Tsiklon. Cosmos 2051 Mass: 3,000 kg (6,600 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 293 km (182 mi). Apogee: 310 km (190 mi). Inclination: 64.90 deg. Period: 90.60 min. Ocean surveillance.

1990 March 14 - 15:27 GMT - Launch Vehicle: Tsiklon. Cosmos 2060 Mass: 3,000 kg (6,600 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 402 km (249 mi). Apogee: 418 km (259 mi). Inclination: 65.00 deg. Period: 92.80 min. Ocean surveillance.

1990 August 23 - 16:17 GMT - Launch Vehicle: Tsiklon. Cosmos 2096 Mass: 3,000 kg (6,600 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 402 km (249 mi). Apogee: 415 km (257 mi). Inclination: 65.00 deg. Period: 92.70 min. Ocean surveillance.

1990 November 14 - 06:33 GMT - Launch Vehicle: Tsiklon. Cosmos 2103 Mass: 3,000 kg (6,600 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 402 km (249 mi). Apogee: 415 km (257 mi). Inclination: 65.00 deg. Period: 92.70 min. Ocean surveillance.

1990 December 4 - 00:48 GMT - Launch Vehicle: Tsiklon. Cosmos 2107 Mass: 3,000 kg (6,600 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 402 km (249 mi). Apogee: 416 km (258 mi). Inclination: 65.00 deg. Period: 92.80 min. Ocean surveillance.

1991 January 18 - 11:34 GMT - Launch Vehicle: Tsiklon. Cosmos 2122 Mass: 3,000 kg (6,600 lb). Spacecraft: US-P. Agency: MO SSSR. Perigee: 401 km (249 mi). Apogee: 415 km (257 mi). Inclination: 65.00 deg. Period: 92.70 min. Ocean surveillance.

1993 March 30 - 12:00 GMT - Launch Vehicle: Tsiklon. Cosmos 2238 Mass: 3,150 kg (6,940 lb). Spacecraft: US-PU. Agency: MO RF. Perigee: 402 km (249 mi). Apogee: 416 km (258 mi). Inclination: 65.00 deg. Period: 92.70 min. First launch of new EORSAT, first of at 120 degree intervals on the same orbit with a 0 degree ascending node. Ocean surveillance.

1993 April 28 - 03:39 GMT - Launch Vehicle: Tsiklon. Cosmos 2244 Mass: 3,150 kg (6,940 lb). Spacecraft: US-PU. Agency: MO RF. Perigee: 402 km (249 mi). Apogee: 416 km (258 mi). Inclination: 65.00 deg. Period: 92.80 min. Second launch of new EORSAT, second of three stationed at 120 degree intervals on the same orbit with a 0 degree ascending node.

1993 July 7 - 07:15 GMT - Launch Vehicle: Tsiklon. Cosmos 2258 Mass: 3,150 kg (6,940 lb). Spacecraft: US-PU. Agency: MO RF. Perigee: 400 km (240 mi). Apogee: 417 km (259 mi). Inclination: 65.00 deg. Period: 92.80 min. Third launch of new EORSAT, final of three stationed at 120 degree intervals on the same orbit with a 0 degree ascending node. Ocean surveillance.

1993 September 17 - 00:43 GMT - Launch Vehicle: Tsiklon. Cosmos 2264 Mass: 3,150 kg (6,940 lb). Spacecraft: US-PU. Agency: MO RF. Perigee: 401 km (249 mi). Apogee: 417 km (259 mi). Inclination: 65.00 deg. Period: 92.80 min. EORSAT, first of three to be stationed at 120 degree intervals on the same orbit with a 215 degree ascending node. However cutbacks in program resulted in the constellation not being completed. Ocean surveillance.

1994 November 2 - 01:04 GMT - Launch Vehicle: Tsiklon. Cosmos 2293 Mass: 3,150 kg (6,940 lb). Spacecraft: US-PU. Agency: MO RF. Perigee: 402 km (249 mi). Apogee: 418 km (259 mi). Inclination: 65.03 deg. Period: 92.78 min. Second launch of new EORSAT, second of three to be stationed at 120 degree intervals on the same orbit with a 215 degree ascending node. However cutbacks in program resulted in the constellation not being completed. Ocean surveillance.

1995 June 8 - 04:43 GMT - Launch Vehicle: Tsiklon. Cosmos 2313 Mass: 3,150 kg (6,940 lb). Spacecraft: US-PU. Agency: MO RF. Perigee: 410 km (250 mi). Apogee: 419 km (260 mi). Inclination: 65.00 deg. Period: 87.60 min. EORSAT, first of three to be stationed at 120 degree intervals on the same orbit with a 143 degree ascending node. However cutbacks in program resulted in the constellation not being completed. Ocean surveillance.

1995 December 20 - 00:52 GMT - Launch Vehicle: Tsiklon. Cosmos 2326 Mass: 3,150 kg (6,940 lb). Spacecraft: US-PU. Agency: MO RF. Perigee: 406 km (252 mi). Apogee: 415 km (257 mi). Inclination: 65.00 deg. Period: 87.20 min. EORSAT, placed in 215 degree ascending node orbital slot. Ocean surveillance; also performed astrophysics research.

1996 December 11 - 12:00 GMT - Launch Vehicle: Tsiklon. Cosmos 2335 Mass: 3,150 kg (6,940 lb). Spacecraft: US-PU. Agency: MO RF. Perigee: 403 km (250 mi). Apogee: 418 km (259 mi). Inclination: 65.00 deg. Period: 92.80 min. EORSAT, second of three to be stationed at 120 degree intervals on the same orbit with a 143 degree ascending node. However cutbacks in program resulted in the constellation not being completed. Still in operation as of December 1997.