Encyclopedia Astronautica
April 25


April 25 Chronology


1947 April 25 - . Launch Site: Wallops Island.
  • First airplane scale model rocket test. - . Nation: USA. Summary: NACA Langley's PARD launched its first rocket-propelled model of a complete airplane for performance evaluation (AF XF-91), at Wallops Island. This was followed by flight tests of models of practically all Air Force and Navy supersonic airplanes..

1953 April 25 - .
  • X-1A Flight 6 - . Crew: Ziegler. Payload: X-1A flight 6. Nation: USA. Related Persons: Ziegler. Class: Manned. Type: Manned rocketplane. Spacecraft: X-1A. Summary: Bell flight 6. Buzz again noted at mach 0.93. Turbopump overspeeding caused pilot to terminate power and jettison remaining fuel..

1954 April 25 - .
  • X-1A Flight 14 - . Crew: Murray. Payload: X-1A flight 14. Nation: USA. Related Persons: Murray. Class: Manned. Type: Manned rocketplane. Spacecraft: X-1A. Summary: AF flight 8. Date estimated..

1956 April 25 - .
  • X-2 Flight 7 - . Crew: Everest. Payload: X-2 # 1 flight 7. Nation: USA. Related Persons: Everest. Class: Manned. Type: Manned rocketplane. Spacecraft: X-2 . Summary: 3d powered flight, mach 1.4 at 15250 m..

1957 April 25 - .
  • X-1E Flight 15 - . Crew: Walker, Joseph. Payload: X-1E flight 15. Nation: USA. Related Persons: Walker, Joseph. Class: Manned. Type: Manned rocketplane. Spacecraft: X-1E. Summary: NACA flight 14. Mach 1.71 at 20435 m. Aileron and rudder pulses..

1957 April 25 - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC9. LV Family: Navaho. Launch Vehicle: Navaho G-26. LV Configuration: Navaho II SM-64 07. FAILURE: Booster shut down 1 m over the pad due to incorrect shutdown timer signal - exploded on pad.. Failed Stage: 1.
  • Navaho G-26 Flight 3 - . Nation: USA. Agency: USAF. Apogee: 0 km ( mi). Vehicle 4 was still not ready for the first Broomstick flight, so vehicle 5 was substituted. It took five attempts before a 15.6 second static test cleared the booster for launch on 29 March. 8 hours and 42 minutes of hold stretched the five-hour countdown out into the evening. The booster ignited, rose 1.3 m, then shut down. The vehicle fell back onto the pad, exploding. Cause was a 15-second timer that was supposed to shut the engines down 15 seconds after the vehicle hold-downs released if a lanyard had not been pulled free of the vehicle as it rose off the ground. The 15 seconds had been reached before the lanyard pulled free, but by then the vehicle had risen off the pad. This made 15 attempts to launch a Navaho, with only two booster ignitions, both resulting in loss of the vehicle. The Northrop crews at the Cape dubbed their competitor the "Never-Go Navaho" to counter jibes directed at them about the "Snark-infested waters" off the launch area. The Air Force was not amused, and had a tiger-team review of the G-26 on a system-basis which recommended several procedures. Meanwhile G-38 launch plans were further delayed over internal USAF wrangles over launch facility construction.

1958 April 25 - .
  • US Air Force manned military space systems program - . Nation: USA. Program: Lunex. The Air Force Ballistic Missile Division published the first development plan for an Air Force manned military space systems program. The objective was to "achieve an early capability to land a man on the moon and return him safely to earth." The program called for the start of a high priority effort (similar to that enjoyed by ballistic missiles), characterized by "concurrency" and single Air Force agency management. The complete program would be carried out in four phases: first, "Man-in-Space Soonest"; second, "Man-in-Space Sophisticated"; third, "Lunar Reconnaissance," exploring the moon by television camera and by a soft landing of an instrumented package on the moon's surface; and finally, "Manned Lunar Landing and Return," which would first test equipment by circumlunar flights returning to earth with instrumented capsules containing animals. Additional Details: US Air Force manned military space systems program.

1959 April 25 - . 05:00 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC18B. Launch Pad: LC18B. LV Family: Delta. Launch Vehicle: Thor DM-18A. LV Configuration: Thor DM-18A 164.
  • Series IV research and development launch - . Nation: USA. Agency: USAF. Apogee: 520 km (320 mi).

1960 April 25 - .
  • USAF authorizes FSD of Dynasoar - . Nation: USA. Class: Manned. Type: Manned spaceplane. Spacecraft: Dynasoar.

1961 April 25 - .
  • Vice President Johnson made head of the National Aeronautics and Space Council. - . Nation: USA. Related Persons: Kennedy; Johnson, Lyndon. Summary: President Kennedy signed legislation making the Vice President of the United States the presiding officer of the National Aeronautics and Space Council..

1961 April 25 - .
  • Birth of Frank De Winne - . Nation: Belgium. Summary: Belgian physician astronaut. Flew on ISS EP-4, ISS EO-20..

1961 April 25 - . 02:26 GMT - . Launch Site: Baikonur. Launch Complex: Baikonur LC51. LV Family: R-9. Launch Vehicle: Romashka. LV Configuration: R-9 No. E15001-02T. FAILURE: Failure.
  • State trials missile test - . Nation: USSR. Agency: RVSN. Apogee: 0 km ( mi).

1961 April 25 - . 16:15 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC14. LV Family: Atlas. Launch Vehicle: Atlas D. LV Configuration: Atlas D 100D. FAILURE: Destroyed by range safety.. Failed Stage: G.
  • Mercury MA-3 - . Payload: Mercury SC8. Nation: USA. Agency: NASA. Program: Mercury. Class: Manned. Type: Manned spacecraft. Spacecraft: Mercury. Decay Date: 1961-04-25 . COSPAR: F610425A. Mercury-Atlas 3 (MA-3) was launched from Cape Canaveral in an attempt to orbit the spacecraft with a 'mechanical astronaut' aboard. After lift-off, the launch vehicle failed to roll to a 70 degree heading and to pitch over into the proper trajectory. The abort-sensing system activated the escape rockets prior to the launch vehicle's destruction by the range safety officer after approximately 40 seconds of flight that had attained an altitude of 16,400 feet. The spacecraft then coasted up to 24,000 feet, deployed its parachutes, and landed in the Atlantic Ocean 2,000 yards north of the launch pad. The spacecraft was recovered and was found to have incurred only superficial damage; it was then shipped to McDonnell for refitting.

1962 April 25 - . Launch Site: Edwards. Launch Complex: Edwards RW04/22. Launch Platform: NB-52. LV Family: X-15. Launch Vehicle: X-15. LV Configuration: X-15 2- A-38. FAILURE: Failure.
  • X-15A test - . Nation: USA. Agency: NASA; USAF. Apogee: 14 km (8 mi). Summary: Maximum Speed - 5879 kph. Maximum Altitude - 32160 m..

1962 April 25 - . 14:00 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC34. LV Family: Saturn I. Launch Vehicle: Saturn C-1. LV Configuration: Saturn C-1 SA-2.
  • - . Nation: USA. Agency: NASA. Apogee: 145 km (90 mi). Second suborbital test of Saturn I. The Saturn SA-2 first stage booster was launched successfully from Cape Canaveral. The rocket was blown up intentionally and on schedule about 2.5 minutes after liftoff at an altitude of 65 miles, dumping the water ballast from the dummy second and third stages into the upper atmosphere. The experiment, Project Highwater, produced a massive ice cloud and lightning-like effects. The eight clustered H-1 engines in the first stage produced 1.3 million pounds of thrust and the maximum speed attained by the booster was 3,750 miles per hour. Modifications to decrease the slight fuel sloshing encountered near the end of the previous flight test were successful.

1962 April 25 - . 16:50 GMT - . Launch Site: ETR Launch Area. Launch Platform: SSBN 609. LV Family: Polaris. Launch Vehicle: Polaris A2. LV Configuration: Polaris A2PE-1.
  • Test mission - . Nation: USA. Agency: USN. Apogee: 1,000 km (600 mi).

1963 April 25 - . Launch Site: Kapustin Yar. Launch Complex: Kapustin Yar V-2. Launch Pad: V-2?. LV Family: Kosmos 2. Launch Vehicle: R-12.
  • - . Nation: Ukraine. Agency: MVS. Apogee: 402 km (249 mi).

1964 April 25 - . Launch Site: Ile du Levant. Launch Pad: CERES. Launch Vehicle: Lex. LV Configuration: Lex 01. FAILURE: Failure.
  • LEX-01 test - . Nation: France. Agency: ONERA. Apogee: 1.00 km (0.60 mi).

1964 April 25 - . 10:19 GMT - . Launch Site: Baikonur. Launch Complex: Baikonur LC31. LV Family: R-7. Launch Vehicle: Vostok 8A92. LV Configuration: Vostok 8A92 R15001-01.
  • Cosmos 29 - . Payload: Zenit-2 11F61 s/n 19. Mass: 4,720 kg (10,400 lb). Nation: USSR. Agency: Korolev. Class: Surveillance. Type: Military surveillance satellite. Spacecraft: Zenit-2. Duration: 7.00 days. Decay Date: 1964-05-02 . USAF Sat Cat: 791 . COSPAR: 1964-021A. Apogee: 292 km (181 mi). Perigee: 203 km (126 mi). Inclination: 65.0000 deg. Period: 89.50 min. Summary: Area survey photo reconnaissance satellite..

1966 April 25 - . 07:12 GMT - . Launch Site: Baikonur. Launch Complex: Baikonur LC31. LV Family: R-7. Launch Vehicle: Molniya 8K78M. LV Configuration: Molniya 8K78M N103-39.
  • Molniya 1-03 - . Payload: Molniya-1. Mass: 1,600 kg (3,500 lb). Nation: USSR. Agency: MOM. Program: Molniya. Class: Communications. Type: Military communications satellite. Spacecraft: Molniya-1. Decay Date: 1973-06-11 . USAF Sat Cat: 2151 . COSPAR: 1966-035A. Apogee: 39,414 km (24,490 mi). Perigee: 546 km (339 mi). Inclination: 65.0000 deg. Period: 709.80 min. Summary: Also transmitted cloud cover images. Television programme transmission and long-range two-way multi-channel telephone, phototelegraph and telegraph communicaitons. .

1967 April 25 - . 06:30 GMT - . Launch Site: Cape Canaveral. LV Family: Tomahawk Sandia. Launch Vehicle: Nike Tomahawk. LV Configuration: Nike Tomahawk MUMP-4.
  • Aeronomy / ionosphere mission - . Nation: USA. Agency: NASA. Apogee: 287 km (178 mi).

1967 April 25 - . 19:00 GMT - . Launch Site: Cape Canaveral. LV Family: Tomahawk Sandia. Launch Vehicle: Nike Tomahawk. LV Configuration: Nike Tomahawk MUMP-5.
  • Aeronomy / ionosphere mission - . Nation: USA. Agency: NASA. Apogee: 334 km (207 mi).

1968 April 25 - .
  • A memorial service is held for Komarov at his crash site near Omsk. - . Nation: USSR. Related Persons: Komarov; Matinchenko. Over 10,000 people come out to the steppe, some driving hundreds of kilometres for the event. Kamanin discharges Matinchenko from the cosmonaut corps. He was in two bad automobile accidents on 19 and 21 April. In one of the accidents a six-year-old child was killed.

1968 April 25 - .
  • HL-10 Flight 4 - . Crew: Gentry. Payload: HL-10 flight 4. Nation: USA. Related Persons: Gentry. Program: NASA Lifting Body. Class: Manned. Type: Manned spaceplane. Spacecraft: HL-10. Summary: Maximum Speed - 739 kph. Maximum Altitude - 13720 m. Flight Time - 258 sec..

1968 April 25 - . 00:43 GMT - . Launch Site: Baikonur. Launch Complex: Baikonur LC162/36. LV Family: Tsiklon. Launch Vehicle: R-36-O. LV Configuration: R-36O 8K69 Ya22500 No. 17L.
  • Cosmos 218 - . Mass: 1,700 kg (3,700 lb). Nation: USSR. Agency: RVSN. Class: Military. Type: Orbital bombing system. Spacecraft: OGCh. Decay Date: 1968-04-25 . USAF Sat Cat: 3217 . COSPAR: 1968-037A. Apogee: 162 km (100 mi). Perigee: 123 km (76 mi). Inclination: 49.6000 deg. Period: 87.30 min. Summary: Fractional Orbital Bombardment System test..

1968 April 25 - . 06:01 GMT - . Launch Site: Fort Churchill. LV Family: Tomahawk Sandia. Launch Vehicle: Nike Tomahawk. LV Configuration: Nike Tomahawk NASA 18.33CE.
  • p / e flux Ionosphere mission - . Nation: USA. Agency: NASA. Apogee: 120 km (70 mi).

1968 April 25 - . 06:23 GMT - . Launch Site: Fort Churchill. LV Family: Tomahawk Sandia. Launch Vehicle: Nike Tomahawk. LV Configuration: Nike Tomahawk NASA 18.42UE.
  • Aurora mission - . Nation: USA. Agency: NASA. Apogee: 262 km (162 mi).

1969 April 25 - .
  • HL-10 Flight 16 - . Crew: Dana. Payload: HL-10 flight 16. Nation: USA. Related Persons: Dana. Program: NASA Lifting Body. Class: Manned. Type: Manned spaceplane. Spacecraft: HL-10. Summary: Glide. Maximum Speed - 743 kph. Maximum Altitude - 13720 m. Flight Time - 252 sec..

1969 April 25 - . Launch Site: Kwajalein. Launch Complex: Kwajalein Meck. Launch Vehicle: Spartan. LV Configuration: Spartan ABM 800010.
  • KT-7 - . Nation: USA. Agency: USA. Apogee: 100 km (60 mi).

1969 April 25 - . Launch Site: Vandenberg. Launch Complex: Vandenberg LF22. LV Family: Minuteman. Launch Vehicle: Minuteman 2. LV Configuration: Minuteman 2 2096.
  • OT GT5F operational test launch - . Nation: USA. Agency: USAF SAC. Apogee: 1,300 km (800 mi).

1969 April 25 - . Launch Site: Baikonur. Launch Complex: Baikonur LC162/36. LV Family: Tsiklon. Launch Vehicle: R-36 8K67.
  • State trials missile test - . Nation: USSR. Agency: RVSN. Apogee: 1,000 km (600 mi).

1970 April 25 - . Launch Vehicle: Spiral 50-50.
  • Spiral project not raised with General Staff. - . Nation: USSR. Related Persons: Dementiev. Program: Soyuz. Flight: Soyuz 9. Spacecraft: Spiral OS. Kamanin has been working for seven years on operation and improvement of the TsEZ Central Experimental Facility of he VVS. This includes the Volchok trainer, which simulates launch to orbit; the centrifuge facility; and numerous special test stands. The facility employs 120 engineers and 300 technicians. Later the Spiral project is discussed by the General Staff. It has been two weeks since Kutakhov promised to clarify Minister Dementiev's position on the project, but he never did talk to him. What is Kamanin expected to tell the cosmonauts training for the program? He is also trying to get a flight plan and press kit together in preparation for the Soyuz 9 mission, but there is no Central Committee resolution allowing this work. The KGB and Central Committee want to keep everything secret.

1970 April 25 - . Launch Site: Vandenberg. Launch Complex: Vandenberg LF22. LV Family: Minuteman. Launch Vehicle: Minuteman 2. LV Configuration: Minuteman 2 2588.
  • OT GT57F operational test launch - . Nation: USA. Agency: USAF SAC. Apogee: 1,300 km (800 mi).

1970 April 25 - . 17:09 GMT - . Launch Site: Plesetsk. Launch Complex: Plesetsk LC132/1. Launch Pad: LC132/pad?. LV Family: Kosmos 3. Launch Vehicle: Kosmos 11K65M.
  • Cosmos 336 - . Payload: Strela-1M no. 1. Mass: 50 kg (110 lb). Nation: USSR. Agency: MO. Program: Strela. Class: Communications. Type: Military store-dump communications satellite. Spacecraft: Strela-1M. USAF Sat Cat: 4383 . COSPAR: 1970-036A. Apogee: 1,486 km (923 mi). Perigee: 1,463 km (909 mi). Inclination: 74.0000 deg. Period: 115.40 min. Summary: Eight satellites launched by a single carrier rocket..
  • Cosmos 339 - . Payload: Strela-1M no. 4. Mass: 50 kg (110 lb). Nation: USSR. Agency: MO. Program: Strela. Class: Communications. Type: Military store-dump communications satellite. Spacecraft: Strela-1M. USAF Sat Cat: 4386 . COSPAR: 1970-036D. Apogee: 1,469 km (912 mi). Perigee: 1,445 km (897 mi). Inclination: 74.0000 deg. Period: 115.00 min.
  • Cosmos 343 - . Payload: Strela-1M no. 8. Mass: 50 kg (110 lb). Nation: USSR. Agency: MO. Program: Strela. Class: Communications. Type: Military store-dump communications satellite. Spacecraft: Strela-1M. USAF Sat Cat: 4390 . COSPAR: 1970-036H. Apogee: 1,468 km (912 mi). Perigee: 1,375 km (854 mi). Inclination: 74.0000 deg. Period: 114.30 min.
  • Cosmos 342 - . Payload: Strela-1M no. 7. Mass: 50 kg (110 lb). Nation: USSR. Agency: MO. Program: Strela. Class: Communications. Type: Military store-dump communications satellite. Spacecraft: Strela-1M. USAF Sat Cat: 4389 . COSPAR: 1970-036G. Apogee: 1,468 km (912 mi). Perigee: 1,310 km (810 mi). Inclination: 74.0000 deg. Period: 113.60 min.
  • Cosmos 341 - . Payload: Strela-1M no. 6. Mass: 50 kg (110 lb). Nation: USSR. Agency: MO. Program: Strela. Class: Communications. Type: Military store-dump communications satellite. Spacecraft: Strela-1M. USAF Sat Cat: 4388 . COSPAR: 1970-036F. Apogee: 1,469 km (912 mi). Perigee: 1,342 km (833 mi). Inclination: 74.0000 deg. Period: 113.90 min.
  • Cosmos 340 - . Payload: Strela-1M no. 5. Mass: 50 kg (110 lb). Nation: USSR. Agency: MO. Program: Strela. Class: Communications. Type: Military store-dump communications satellite. Spacecraft: Strela-1M. USAF Sat Cat: 4387 . COSPAR: 1970-036E. Apogee: 1,470 km (910 mi). Perigee: 1,407 km (874 mi). Inclination: 74.0000 deg. Period: 114.60 min.
  • Cosmos 338 - . Payload: Strela-1M no. 3. Mass: 50 kg (110 lb). Nation: USSR. Agency: MO. Program: Strela. Class: Communications. Type: Military store-dump communications satellite. Spacecraft: Strela-1M. USAF Sat Cat: 4385 . COSPAR: 1970-036C. Apogee: 1,518 km (943 mi). Perigee: 1,468 km (912 mi). Inclination: 74.0000 deg. Period: 115.80 min.
  • Cosmos 337 - . Payload: Strela-1M no. 2. Mass: 50 kg (110 lb). Nation: USSR. Agency: MO. Program: Strela. Class: Communications. Type: Military store-dump communications satellite. Spacecraft: Strela-1M. USAF Sat Cat: 4384 . COSPAR: 1970-036B. Apogee: 1,552 km (964 mi). Perigee: 1,468 km (912 mi). Inclination: 74.0000 deg. Period: 116.20 min.

1971 April 25 - . 06:00 GMT - . Launch Site: Thumba. LV Family: Apache. Launch Vehicle: Nike Apache. LV Configuration: Nike Apache NASA 14.407II/IE.
  • ISRO 10.40 Ionosphere / plasma mission - . Nation: USA. Agency: NASA. Apogee: 160 km (90 mi).

1971 April 25 - . 13:25 GMT - . Launch Site: Thumba. LV Family: Apache. Launch Vehicle: Nike Apache. LV Configuration: Nike Apache NASA 14.408IA.
  • ISRO 10.39 Aeronomy mission - . Nation: USA. Agency: NASA. Apogee: 100 km (60 mi).

1972 April 25 - . 11:29 GMT - . Launch Site: Plesetsk. Launch Complex: Plesetsk LC133/1. LV Family: Kosmos 2. Launch Vehicle: Kosmos 11K63. FAILURE: Second stage failed 367 seconds after launch.. Failed Stage: 2.
  • DS-P1-Yu s/n 51 - . Payload: DS-P1-Yu. Nation: USSR. Agency: RVSN. Program: DS. Class: Military. Type: Military target satellite. Spacecraft: DS-P1-Yu. COSPAR: F720425A. Summary: Development of systems for air defence and the control of outer space..

1972 April 25 - . 20:33 GMT - .
  • EVA Apollo 16-5 - . Crew: Mattingly; Duke. EVA Type: Stand-Up External Vehicular Activity. EVA Duration: 0.0507 days. Nation: USA. Related Persons: Mattingly; Duke. Program: Apollo. Class: Moon. Type: Manned lunar spacecraft. Flight: Apollo 16. Spacecraft: Apollo CSM. Summary: Deep space retrieval of film cartridges from Service Module..

1973 April 25 - . Launch Site: Vandenberg. Launch Complex: Vandenberg LF03. LV Family: Minuteman. Launch Vehicle: Minuteman 1B.
  • HK-2 - . Nation: USA. Agency: USAF AFSC. Apogee: 1,300 km (800 mi).

1973 April 25 - . Launch Site: Baikonur. Launch Complex: Baikonur LC90/19. Launch Pad: LC90/pad?. LV Family: Tsiklon. Launch Vehicle: Tsiklon-2. FAILURE: Payload propulsion system failed; no orbit.. Failed Stage: P.
  • RORSAT failure - . Mass: 3,800 kg (8,300 lb). Nation: USSR. Agency: RVSN. Program: RORSAT. Class: Surveillance. Type: Military naval surveillance radar satellite. Spacecraft: US-A. Decay Date: 1973-04-25 . COSPAR: F730425A. Summary: 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 April 25 - . 10:45 GMT - . Launch Site: Plesetsk. LV Family: R-7. Launch Vehicle: Voskhod 11A57.
  • Cosmos 555 - . Mass: 6,000 kg (13,200 lb). Nation: USSR. Agency: MOM. Class: Surveillance. Type: Military surveillance satellite. Spacecraft: Zenit-2M. Duration: 12.00 days. Decay Date: 1973-05-07 . USAF Sat Cat: 6440 . COSPAR: 1973-024A. Apogee: 230 km (140 mi). Perigee: 216 km (134 mi). Inclination: 81.0000 deg. Period: 88.90 min. Summary: Area survey photo reconnaissance satellite; returned film capsule; separated science capsule..
  • Nauka Cosmos 555 - . Payload: Nauka. Nation: USSR. Agency: MOM. Spacecraft: Nauka. Decay Date: 1973-05-09 . USAF Sat Cat: 6445 . COSPAR: 1973-024D. Apogee: 204 km (126 mi). Perigee: 192 km (119 mi). Inclination: 81.3000 deg. Period: 88.45 min.

1974 April 25 - . 22:00 GMT - . Launch Site: Kapustin Yar. Launch Complex: Kapustin Yar V-2. LV Family: M-100. Launch Vehicle: M-100.
  • - . Nation: USSR. Apogee: 85 km (52 mi).

1975 April 25 - . 04:13 GMT - . Launch Site: Fort Churchill. LV Family: Tomahawk Sandia. Launch Vehicle: Paiute Tomahawk. LV Configuration: Paiute Tomahawk CRL A10.302-5.
  • AEOLUS TMA / Barium release Aeronomy mission - . Nation: USA. Agency: USAF CRL. Apogee: 214 km (132 mi).

1975 April 25 - . 04:13 GMT - . Launch Site: Fort Churchill. LV Family: Tomahawk Sandia. Launch Vehicle: Paiute Tomahawk. LV Configuration: Paiute Tomahawk CRL A10.302-7.
  • AEOLUS TMA / Barium release Aeronomy mission - . Nation: USA. Agency: USAF CRL. Apogee: 220 km (130 mi).

1975 April 25 - . 04:18 GMT - . Launch Site: Fort Churchill. LV Family: Tomahawk Sandia. Launch Vehicle: Paiute Tomahawk. LV Configuration: Paiute Tomahawk CRL A10.403-2.
  • AEOLUS Mass Spectrometer Aeronomy mission - . Nation: USA. Agency: USAF CRL. Apogee: 217 km (134 mi).

1976 April 25 - . Launch Site: Wallops Island. LV Family: Athena RTV. Launch Vehicle: Athena RTV. LV Configuration: Athena SAMSO-39.
  • ABRES Re-entry Vehicle test - . Nation: USA. Agency: USAF; Sandia. Apogee: 200 km (120 mi).

1977 April 25 - . 18:06 GMT - . Launch Site: Wallops Island. Launch Vehicle: Rocketsonde.
  • Arcasonde - . Nation: USA. Agency: MRN. Apogee: 69 km (42 mi).

1978 April 25 - . 08:50 GMT - . Launch Site: Koroni. LV Family: M-100. Launch Vehicle: M-100.
  • - . Nation: USSR. Apogee: 84 km (52 mi).

1979 April 25 - . 03:44 GMT - . Launch Site: Baikonur. Launch Complex: Baikonur LC200/40. LV Family: Proton. Launch Vehicle: Proton-K/DM. LV Configuration: Proton-K/DM 298-02.
  • Raduga 5 - . Payload: Raduga s/n 15L. Mass: 1,940 kg (4,270 lb). Nation: USSR. Agency: MOM. Class: Communications. Type: Military communications satellite. Spacecraft: Raduga . Completed Operations Date: 1982-05-27 . USAF Sat Cat: 11343 . COSPAR: 1979-035A. Apogee: 35,802 km (22,246 mi). Perigee: 35,785 km (22,235 mi). Inclination: 11.9000 deg. Period: 1,436.50 min. Provision of uninterrupted round the clock telephone and telegraph radiocommunication in the USSR and simultaneous transmission of colour and black-and-white USSR central television programmes to stations in the Orbita network. Positioned in geosynchronous orbit at 85 deg E in 1979-1982 As of 29 August 2001 located at 84.16 deg E drifting at 0.043 deg E per day. As of 2007 Mar 10 located at 65.45E drifting at 0.034E degrees per day.

1979 April 25 - . 10:00 GMT - . Launch Site: Baikonur. Launch Complex: Baikonur LC90/19. Launch Pad: LC90/pad?. LV Family: Tsiklon. Launch Vehicle: Tsiklon-2.
  • Cosmos 1096 - . Mass: 3,000 kg (6,600 lb). Nation: USSR. Agency: MO. Program: EORSAT. Class: Military. Type: Military naval signals reconnaisance satellite. Spacecraft: US-P. Decay Date: 1979-11-24 . USAF Sat Cat: 11346 . COSPAR: 1979-036A. Apogee: 442 km (274 mi). Perigee: 428 km (265 mi). Inclination: 65.1000 deg. Period: 93.30 min. Summary: Ocean monitoring..

1979 April 25 - . 12:24 GMT - . Launch Site: South Uist. LV Family: Petrel. Launch Vehicle: Petrel 1. LV Configuration: Petrel P201H.
  • Ionosphere mission - . Nation: UK. Agency: SRC. Apogee: 130 km (80 mi).

1980 April 25 - . 09:00 GMT - . Launch Site: Sea-launched. Launch Pad: UNKO. Launch Platform: PRILIV. Launch Vehicle: MMR-06.
  • Aeronomy mission - . Nation: USSR. Agency: GMS. Apogee: 61 km (37 mi).

1981 April 25 - . 02:01 GMT - . Launch Site: Baikonur. Launch Complex: Baikonur LC200/39. LV Family: Proton. Launch Vehicle: Proton-K. LV Configuration: Proton-K 299-02.
  • Cosmos 1267 - . Payload: TKS s/n 16301. Mass: 19,000 kg (41,000 lb). Nation: USSR. Agency: MOM. Program: Almaz. Class: Manned. Type: Manned spacecraft. Spacecraft: TKS . Duration: 459.91 days. Decay Date: 1982-07-29 . USAF Sat Cat: 12419 . COSPAR: 1981-039A. Apogee: 259 km (160 mi). Perigee: 192 km (119 mi). Inclination: 51.6000 deg. Period: 88.90 min. TKS space station ferry. Flown unmanned to the Salyut 6 space station after the Almaz military station program was cancelled. Capsule recovered 24 May 1981. Docked with Salyut 6 on June 19 at 10:52 AM MT after 57 days autonomous flight. Deorbited and destroyed with Salyut July 29, 1982. Additional Details: Cosmos 1267.

1983 April 25 - . 19:34 GMT - . Launch Site: Plesetsk. Launch Complex: Plesetsk LC16/2. LV Family: R-7. Launch Vehicle: Molniya 8K78M. LV Configuration: Molniya 8K78M-2BL.
  • Cosmos 1456 - . Payload: Oko #29. Mass: 1,250 kg (2,750 lb). Nation: USSR. Agency: MOM. Class: Military. Type: Early warning satellite. Spacecraft: Oko. Decay Date: 1998-05-11 . USAF Sat Cat: 14034 . COSPAR: 1983-038A. Apogee: 38,464 km (23,900 mi). Perigee: 1,871 km (1,162 mi). Inclination: 66.6000 deg. Period: 717.40 min. Summary: Replaced Cosmos 1191. Covered Oko constellation plane 4 - 37 degree longitude of ascending node..

1984 April 25 - . 18:31 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC47. Launch Vehicle: Rocketsonde.
  • Arcasonde - . Nation: USA. Agency: MRN. Apogee: 70 km (43 mi).

1985 April 25 - . 09:30 GMT - . Launch Site: Plesetsk. LV Family: R-7. Launch Vehicle: Soyuz 11A511U.
  • Cosmos 1648 - . Mass: 6,300 kg (13,800 lb). Nation: USSR. Agency: MOM. Class: Earth. Type: Earth resources satellite. Spacecraft: Zenit-8. Duration: 11.00 days. Decay Date: 1985-05-06 . USAF Sat Cat: 15659 . COSPAR: 1985-032A. Apogee: 234 km (145 mi). Perigee: 179 km (111 mi). Inclination: 82.3000 deg. Period: 88.60 min. Summary: Military cartographic satellite; returned film capsule..

1986 April 25 - . 13:30 GMT - . Launch Site: White Sands. LV Family: Hawk. Launch Vehicle: Nike Orion. LV Configuration: Nike Orion NASA 31.58UU. FAILURE: Failure.
  • CWAS 14 Aeronomy mission - . Nation: USA. Agency: NASA. Apogee: 140 km (80 mi).

1990 April 25 - . 05:32 GMT - . Launch Site: Wallops Island. LV Family: Terrier. Launch Vehicle: Terrier Malemute. LV Configuration: Terrier Malemute SDIO BSUV.
  • Bow Shock 1 re-entry vehicle test flight - . Nation: USA. Agency: SDIO. Apogee: 721 km (448 mi).

1990 April 25 - . 13:00 GMT - . Launch Site: Plesetsk. Launch Complex: Plesetsk LC132/2. LV Family: Kosmos 3. Launch Vehicle: Kosmos 11K65M. LV Configuration: Kosmos 11K65M 65061-253.
  • Cosmos 2075 - . Mass: 1,000 kg (2,200 lb). Nation: USSR. Agency: MO. Class: Military. Type: Radar calibration target. Spacecraft: Taifun-2. Decay Date: 1992-02-20 . USAF Sat Cat: 20581 . COSPAR: 1990-038A. Apogee: 439 km (272 mi). Perigee: 418 km (259 mi). Inclination: 74.0000 deg. Period: 93.20 min. Summary: Released 25 Romb radar calibration subsatellites..

1991 April 25 - . 18:00 GMT - . Launch Site: Poker Flat. LV Family: Hawk. Launch Vehicle: Nike Orion. LV Configuration: Nike Orion NASA 31.79UU.
  • CWAS 19 Aeronomy mission - . Nation: USA. Agency: NASA. Apogee: 140 km (80 mi).

1992 April 25 - . 08:53 GMT - . Launch Site: Vandenberg. Launch Complex: Vandenberg SLC4W. LV Family: Titan. Launch Vehicle: Titan 2G. LV Configuration: Titan II SLV 23G-3 / M68B-102 / 65-10646.
  • USA 81 - . Payload: SBWASS R3. Mass: 1,700 kg (3,700 lb). Nation: USA. Agency: USAF. Class: Military. Type: Military naval signals reconnaisance satellite. Spacecraft: Singleton. USAF Sat Cat: 21949 . COSPAR: 1992-023A. Apogee: 175 km (108 mi). Perigee: 145 km (90 mi). Inclination: 84.9000 deg. Period: 89.30 min. Summary: Signals intelligence satellite; possibly some kind of imaging also done. On-board propulsion boosts spacecraft to 800 km operating orbit..

1993 April 25 - . 13:56 GMT - . Launch Site: Point Arguello WADZ. Launch Pad: 36.0 N x 123.0 W. Launch Platform: NB-52 008. LV Family: Pegasus. Launch Vehicle: Pegasus. LV Configuration: Pegasus 004/F4.
  • Alexis - . Payload: Alexis (P 89-1B). Mass: 115 kg (253 lb). Nation: USA. Agency: USAF STP. Class: Astronomy. Type: X-ray astronomy satellite. Spacecraft: Alexis. USAF Sat Cat: 22638 . COSPAR: 1993-026A. Apogee: 746 km (463 mi). Perigee: 741 km (460 mi). Inclination: 69.8000 deg. Period: 99.70 min. Summary: Test of X-ray imaging sensors; solar array deployment malfunction. Spacecraft engaged in research and exploration of the upper atmosphere or outer space (US Cat B)..
  • Orbcomm OXP-2 - . Payload: VSUM. Nation: USA. Agency: Orbcomm. Program: Orbcomm. Class: Communications. Type: Civilian communications satellite. Spacecraft: Orbcomm. USAF Sat Cat: 22639 . COSPAR: 1993-026B. Apogee: 843 km (524 mi). Perigee: 752 km (468 mi). Inclination: 69.9160 deg. Period: 100.74 min.

1994 April 25 - . 20:45 GMT - . Launch Site: White Sands. Launch Complex: White Sands LC36. LV Family: Black Brant. Launch Vehicle: Black Brant 9. LV Configuration: Black Brant IX NASA 36.123CS.
  • Solar mission - . Nation: USA. Agency: NASA. Apogee: 300 km (180 mi).

1997 April 25 - . Launch Site: Wallops Island. Launch Vehicle: Hyperion. LV Configuration: Hyperion FPDP 4.
1997 April 25 - . 05:49 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC36B. LV Family: Atlas. Launch Vehicle: Atlas I. LV Configuration: Atlas I AC-79.
  • GOES 10 - . Payload: GOES K. Nation: USA. Agency: NOAA. Manufacturer: Palo Alto. Program: GOES. Class: Earth. Type: Weather satellite. Spacecraft: GOES-Next. USAF Sat Cat: 24786 . COSPAR: 1997-019A. Apogee: 35,799 km (22,244 mi). Perigee: 35,780 km (22,230 mi). Inclination: 0.4000 deg. Period: 1,436.30 min. Geosynchronous. Stationed over 105.7W Launch vehicle put payload into supersynchronous earth orbit with MRS trajectory option. Positioned in geosynchronous orbit at 105 deg W in 1997-1998; 135 deg W in 1998-1999 As of 6 September 2001 located at 135.09 deg W drifting at 0.037 deg W per day. As of 2007 Mar 11 located at 59.64W drifting at 0.009W degrees per day.

2000 April 25 - . 20:08 GMT - . Launch Site: Baikonur. Launch Complex: Baikonur LC1. LV Family: R-7. Launch Vehicle: Soyuz 11A511U.
  • Progress M1-2 - . Payload: Progress M1 s/n 252. Mass: 7,280 kg (16,040 lb). Nation: Russia. Agency: RAKA. Manufacturer: Korolev. Program: Mir. Class: Manned. Type: Manned logistics spacecraft. Flight: Mir EO-28. Spacecraft: Progress M1. Duration: 173.00 days. Decay Date: 2000-10-15 . USAF Sat Cat: 26301 . COSPAR: 2000-021A. Apogee: 380 km (230 mi). Perigee: 363 km (225 mi). Inclination: 51.6000 deg. Period: 91.98 min. Summary: Progress M1-2 docked with the rear Kvant port of Mir at 2128 GMT on April 27. Mir's orbit was raised on April 29 in the first of a series of three burns by Progress M1-2. It later undocked and was deorbited over the Pacific on 15 October..

2001 April 25 - .
  • STS-100 Mission Status Report #13 - . Nation: USA. Related Persons: Hadfield; Helms; Parazynski; Voss. Program: ISS. Flight: ISS EO-2; STS-100. Troubleshooting efforts designed to restore full capability to the International Space Station's three redundant command and control computers continue in Mission Control, even as the 10 astronauts and cosmonauts on board the outpost worked together today to install new experiments in the Destiny laboratory. Additional Details: STS-100 Mission Status Report #13.

2002 April 25 - . Launch Site: ETR Launch Area. Launch Platform: SSBN 743. LV Family: Trident. Launch Vehicle: Trident D-5. LV Configuration: Trident D-5 FCET-27.
  • Operational test - . Nation: USA. Agency: USN. Apogee: 1,000 km (600 mi).

2002 April 25 - . 06:26 GMT - . Launch Site: Baikonur. Launch Complex: Baikonur LC1. LV Family: R-7. Launch Vehicle: Soyuz 11A511U.
  • Soyuz TM-34 - . Call Sign: Uran. Crew: Gidzenko; Vittori; Shuttleworth. Payload: Soyuz TM 11F732 s/n 208. Mass: 6,750 kg (14,880 lb). Nation: Russia. Related Persons: Gidzenko; Vittori; Shuttleworth. Agency: RAKA. Manufacturer: Korolev. Program: ISS. Class: Manned. Type: Manned spacecraft. Flight: ISS EP-3. Spacecraft: Soyuz TM. Duration: 198.73 days. Decay Date: 2002-11-10 . USAF Sat Cat: 27416 . COSPAR: 2002-020A. Apogee: 397 km (246 mi). Perigee: 387 km (240 mi). Inclination: 51.6000 deg. Period: 92.40 min. Launch delayed from April 10, 22 and 17. Soyuz TM-34 was launched on ISS Mission 4S with Commander Yuri Gidzenko of Rosaviakosmos, Flight Engineer is Roberto Vittori of ESA, and Tourist Mark Shuttleworth, a South African citizen. At 1210 UTC Soyuz TM-34 was in a 242 x 269 km x 51.6 deg orbit. The flight was also referred to as ISS Mission 4S, the EP-3 visiting crew flight, and even as 'Soyuz 4' by NASA. Soyuz TM-34 docked with the nadir port on the Zarya module at 0755 UTC on April 27. The 4S flight docked at the Zarya nadir port on April 27. and the crew would return to Earth in the old TM-33 vehicle, leaving TM-34 as the active ISS rescue vehicle.

2002 April 25 - . 13:00 GMT - . Launch Site: White Sands. Launch Vehicle: Storm-2.
  • PAC-3 OT/DT-4 Target mission - . Nation: USA. Agency: USA SSDC. Apogee: 100 km (60 mi).

2003 April 25 - .
2006 April 25 - . 16:47 GMT - . Launch Site: Svobodniy. Launch Complex: Svobodniy LC5. LV Family: Topol. Launch Vehicle: Start-1. LV Configuration: Start-1 No. 441.
  • EROS-B - . Mass: 350 kg (770 lb). Nation: Israel. Agency: ImageSat. Manufacturer: IAI. Class: Surveillance. Type: Civilian surveillance satellite. Spacecraft: Ofeq 3. USAF Sat Cat: 29079 . COSPAR: 2006-014A. Apogee: 514 km (319 mi). Perigee: 505 km (313 mi). Inclination: 97.3000 deg. Period: 94.80 min. Summary: Combined civilian/military imaging satellite operated by an Israeli company incorporated in the Cayman Islands. Its capability was demonstrated when, within days of launch, sharp photographs of people and motor vehicles on a Syrian dam were released..

2007 April 25 - . 20:26 GMT - . Launch Site: Point Arguello WADZ. Launch Pad: 36.0 N x 123.0 W. LV Family: Pegasus. Launch Vehicle: Pegasus XL. LV Configuration: Pegasus XL F38.
  • AIM - . Mass: 150 kg (330 lb). Nation: USA. Agency: NASA; Hampton. Manufacturer: OSC; Ball. Spacecraft: RS-300. USAF Sat Cat: 31304 . COSPAR: 2007-015A. Apogee: 602 km (374 mi). Perigee: 584 km (362 mi). Inclination: 97.8000 deg. Period: 96.50 min. Summary: NASA Small Explorer mission, for Aeronomy of Ice in the Mesosphere. AIM carried three scientific instruments to study polar mesospheric clouds: a solar occultation camera, an ultraviolet imager, and a cosmic dust experiment..

2008 April 25 - . 15:35 GMT - . Launch Site: Xichang. LV Family: CZ. Launch Vehicle: CZ-3C. LV Configuration: CZ-3C s/n CZ3C1.
  • Tian Lian 1 - . Payload: DFH 76. Mass: 3,000 kg (6,600 lb). Nation: China. Agency: SISE. Class: Communications. Type: Military communications satellite. Spacecraft: DFH-4. USAF Sat Cat: 32779 . COSPAR: 2008-019A. Apogee: 35,806 km (22,248 mi). Perigee: 35,768 km (22,225 mi). Inclination: 0.4000 deg. Period: 1,436.10 min. China's first in a series of new data relay satellites, and the first launch of the CZ-3C, a variant of the Long March with two liquid strap-ons. The satellite will relay data from Chinese manned and military satellites, beginning with the Shenzhou mission, from geostationary orbit at 77 deg E. Configuration unknown, but possibly based on the DFH-4 platform.

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