Chronology - Quarter 2 1973 home
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1973 April 3 -
  • Studies on controlled deorbit of the Skylab 1 Orbital Workshop. Nation: USA. Program: Skylab. Spacecraft: Skylab. Studies were conducted to determine the feasibility of conducting a controlled deorbit of the Orbital Workshop. Three methods were considered: (l) using the CSM service propulsion system; (2) using the CSM reaction control system; and (3) implementing an S-II (Saturn V second stage) deorbit. The service propulsion system deorbit was assessed as not feasible; the reaction control system deorbit was considered technically feasible but, like the service propulsion system, it had an inherent program and crew safety risk associated with it. Implementation of an S-II deorbit would have serious time and cost impacts on the program. A 1970 study, which indicated that the probability of damage from the deorbiting Skylab was so small that changes which caused major impact in cost and schedule were not worth pursuing, was confirmed.
1973 April 3 - 06:09 GMT - Launch Site: South Uist. Launch Complex: -. Launch Pad: -. Launch Vehicle: Petrel. Model: Petrel 1. LV Configuration: Petrel P131H.
  • D-Region / Solar La / X Ionosphere-solar mission Ionosphere-solar mission Nation: UK. Agency: SRC. Apogee: 131 km (81 mi). References: 2.
1973 April 3 - 06:54 GMT - Launch Site: South Uist. Launch Complex: -. Launch Pad: -. Launch Vehicle: Petrel. Model: Petrel 1. LV Configuration: Petrel P133H.
  • D-Region / Solar La / X Ionosphere-solar mission Ionosphere-solar mission Nation: UK. Agency: SRC. Apogee: 132 km (82 mi). References: 2.
1973 April 3 - 08:14 GMT - Launch Site: South Uist. Launch Complex: -. Launch Pad: -. Launch Vehicle: Petrel. Model: Petrel 1. LV Configuration: Petrel P105H.
  • D-Region / Solar La / X Ionosphere-solar mission Ionosphere-solar mission Nation: UK. Agency: SRC. Apogee: 137 km (85 mi). References: 2.
1973 April 3 - 09:00 GMT - Launch Site: Baikonur. Launch Complex: LC81/23. Launch Pad: -. Launch Vehicle: Proton. Model: Proton-K. LV Configuration: Proton-K 283-01.
  • Salyut 2 Nation: USSR. Program: Almaz. Payload: Almaz s/n 101-01. Mass: 18,500 kg (40,700 lb). Class: Manned. Type: Space station. Spacecraft: Almaz OPS. Agency: MOM. Perigee: 216 km (134 mi). Apogee: 248 km (154 mi). Inclination: 51.60 deg. Period: 89.10 min. COSPAR: 1973-017A. USAF Sat Cat: 6398. Duration: 54.62 days. Decay Date: 1973-05-28. The first flight of the Almaz manned military space station. In January 1973 the first Almaz OPS was delivered to Baikonur. Launch and initial orbital checkout went according to plan. But before a crew could be launched the station depressurized. It was concluded that a short in electrical equipment started a fire in pressure vessel, leading to rupture of hull and depressurization. An alternate theory was that debris from an explosion of the third stage of Proton penetrated the hull. Control was lost on April 25, 1973, and the OPS cased operations on 29 April. Decayed May 28, 1973. Initial crew was to have been Popovich and Artyukhin.
    Officially: Testing of improved design, on-board systems and equipment; conduct of scientific and technical research and experiments. Additional Details: Salyut 2. References: 2, 6, 67, 274.
1973 April 3 - 09:48 GMT - Launch Site: South Uist. Launch Complex: -. Launch Pad: -. Launch Vehicle: Petrel. Model: Petrel 1. LV Configuration: Petrel P132H.
  • D-Region / Solar La / X Ionosphere-solar mission Ionosphere-solar mission Nation: UK. Agency: SRC. Apogee: 139 km (86 mi). References: 2.
1973 April 3 - 14:52 GMT - Launch Site: South Uist. Launch Complex: -. Launch Pad: -. Launch Vehicle: Petrel. Model: Petrel 1. LV Configuration: Petrel P134H.
  • D-Region / Solar La / X Ionosphere-solar mission Ionosphere-solar mission Nation: UK. Agency: SRC. Apogee: 140 km (80 mi). References: 2.
1973 April 3 - 16:15 GMT - Launch Site: South Uist. Launch Complex: -. Launch Pad: -. Launch Vehicle: Petrel. Model: Petrel 1. LV Configuration: Petrel P104H.
  • D-Region / Solar La / X Ionosphere-solar mission Ionosphere-solar mission Nation: UK. Agency: SRC. Apogee: 136 km (84 mi). References: 2.
1973 April 3 - 17:20 GMT - Launch Site: White Sands. Launch Complex: LC36. Launch Pad: -. Launch Vehicle: Black Brant. Model: Black Brant 5C. LV Configuration: Black Brant VC NASA 21.11DS-NP.
  • Solar mission Nation: USA. Agency: NASA. Apogee: 245 km (152 mi). References: 2.
1973 April 3 - 17:44 GMT - Launch Site: South Uist. Launch Complex: -. Launch Pad: -. Launch Vehicle: Petrel. Model: Petrel 1. LV Configuration: Petrel P135H.
  • D-Region / Solar La / X Ionosphere-solar mission Ionosphere-solar mission Nation: UK. Agency: SRC. Apogee: 134 km (83 mi). References: 2.
1973 April 5 - 11:11 GMT - Launch Site: Plesetsk. Launch Complex: -. Launch Pad: -. Launch Vehicle: Soyuz. Model: Molniya 8K78M.
  • Molniya 2-05 Nation: USSR. Program: Molniya. Payload: Molniya-2. Mass: 1,600 kg (3,500 lb). Class: Communications. Spacecraft: Molniya-2. Agency: MOM. Perigee: 532 km (330 mi). Apogee: 39,822 km (24,744 mi). Inclination: 65.20 deg. Period: 717.70 min. COSPAR: 1973-018A. USAF Sat Cat: 6418. Decay Date: 1979-01-06. Continued operation of the long-range telephone and telegraph radio-communication system within the Soviet Union and transmission of USSR central television programmes to stations in the Orbita and participating international networks (international cooperation scheme). References: 2, 6.
1973 April 6 - Launch Site: Baikonur. Launch Complex: LC177. Launch Pad: -. Launch Vehicle: MR-UR-100. Model: MR-UR-100.
  • State trials missile test Nation: USSR. Agency: RVSN. Apogee: 1,000 km (600 mi). References: 2.
1973 April 6 - Launch Site: Baikonur. Launch Complex: LC104. Launch Pad: -. Launch Vehicle: R-36M.
  • State trials missile test Nation: USSR. Agency: RVSN. Apogee: 1,000 km (600 mi). References: 2.
1973 April 6 - 02:11 GMT - Launch Site: Cape Canaveral. Launch Complex: LC36B. Launch Pad: -. Launch Vehicle: Atlas. Model: SLV-3D Centaur. LV Configuration: SLV-3D Centaur AC-30 / Centaur D-1AR 5011D.
  • Pioneer 11 Nation: USA. Program: Pioneer. Payload: Pioneer G. Mass: 259 kg (570 lb). Class: Planetary. Type: Outer Planets. Spacecraft: Pioneer 10-11. Agency: NASA ARC. COSPAR: 1973-019A. USAF Sat Cat: 6421. Jupiter flyby December 1974; Saturn flyby September 1979. Solar system escape trajectory. Pioneer 11 was the second mission to investigate Jupiter and the outer solar system and the first to explore the planet Saturn and its main rings. Pioneer 11, like Pioneer 10, used Jupiter's gravitational field to alter its trajectory radically. It passed close to Saturn and then it followed an escape trajectory from the solar system. During its closest approach, December 4, 1974, Pioneer 11 passed to within 34,000 km of Jupiter's cloud tops. It passed by Saturn on September 1, 1979, at a distance of 21,000 km from Saturn's cloud tops. The spacecraft has operated on a backup transmitter since launch. Instrument power sharing began in February 1985 due to declining RTG power output. Science operations and daily telemetry ceased on September 30, 1995 when the RTG power level was insufficient to operate any experiments. As of the end of 1995 the spacecraft was located at 44.7 AU from the Sun at a nearly asymptotic latitude of 17.4 degrees above the solar equatorial plane and was heading outward at 2.5 AU/year. Routine tracking and project data processing operations were terminated on March 31, 1997 for budget reasons. References: 2, 6, 278, 296.
1973 April 8 - Launch Site: Baikonur. Launch Complex: LC162/36. Launch Pad: -. Launch Vehicle: Tsiklon. Model: R-36 8K67PM. FAILURE: Failure.
  • State trials missile test Nation: USSR. Agency: RVSN. Apogee: 0 km ( mi). References: 2.
1973 April 9 - Launch Site: Baikonur. Launch Complex: -. Launch Pad: -. Launch Vehicle: UR-100N. Model: UR-100N.
  • Mod 2 state trials missile test Nation: USSR. Agency: RVSN. Apogee: 1,000 km (600 mi). References: 2.
1973 April 10 - 06:59 GMT - Launch Site: White Sands. Launch Complex: -. Launch Pad: -. Launch Vehicle: Aerobee. Model: Aerobee 170. LV Configuration: Aerobee 170 NASA 13.91DG.
  • Astronomy mission Nation: USA. Agency: NASA. Apogee: 198 km (123 mi). References: 2.
1973 April 11 - 17:50 GMT - Launch Site: Thumba. Launch Complex: -. Launch Pad: -. Launch Vehicle: Belier. Model: Centaure 2A. LV Configuration: Centaure 2A ISRO 5.20.
  • ISRO 5.20 Fields mission Nation: India. Agency: ISRO. Apogee: 151 km (93 mi). References: 2.
1973 April 12 - 11:49 GMT - Launch Site: Plesetsk. Launch Complex: LC133/1. Launch Pad: -. Launch Vehicle: Kosmos 2. Model: Kosmos 11K63.
  • Cosmos 553 Nation: USSR. Program: DS. Payload: DS-P1-Yu s/n 55. Mass: 400 kg (880 lb). Class: Military. Type: Target. Spacecraft: DS-P1-Yu. Agency: MO SSSR. Perigee: 272 km (169 mi). Apogee: 494 km (306 mi). Inclination: 71.00 deg. Period: 92.20 min. COSPAR: 1973-020A. USAF Sat Cat: 6427. Completed Operations Date: 1973-11-12. Decay Date: 1973-11-11. Development of systems for air defence and the control of outer space. References: 2, 6, 99.
1973 April 16 - 10:04 GMT - Launch Site: White Sands. Launch Complex: -. Launch Pad: -. Launch Vehicle: Tomahawk Sandia. Model: Ute Tomahawk. LV Configuration: Ute Tomahawk CRL A09.209-1.
  • Photometers Aeronomy mission Nation: USA. Agency: USAF CRL. Apogee: 195 km (121 mi). References: 2.
1973 April 16 - 11:58 GMT - Launch Site: White Sands. Launch Complex: -. Launch Pad: -. Launch Vehicle: Tomahawk Sandia. Model: Ute Tomahawk. LV Configuration: Ute Tomahawk CRL A09.102-1.
  • Photometers Aeronomy mission Nation: USA. Agency: USAF CRL. Apogee: 209 km (129 mi). References: 2.
1973 April 17 - 10:30 GMT - Launch Site: Kourou. Launch Complex: ALFS. Launch Pad: -. Launch Vehicle: Veronique. Model: Veronique 61M. LV Configuration: Veronique 61M 61M/95.
  • FU-200 Solar ultraviolet Solar extreme ultraviolet mission Nation: France. Agency: CNES. Apogee: 200 km (120 mi). FU200 3SUV, UV solar astronomy / Ptr mission. References: 2.
1973 April 17 - 15:35 GMT - Launch Site: Woomera. Launch Complex: LA2. Launch Pad: LA2 SL. Launch Vehicle: Skylark. Model: Skylark 6 AC. LV Configuration: Skylark 6 AC SL1011.
  • Mod collimator X-ray astronomy mission Nation: UK. Agency: BAC. Apogee: 214 km (132 mi). References: 2.
1973 April 18 - 04:25 GMT - Launch Site: Vandenberg. Launch Complex: LF02. Launch Pad: -. Launch Vehicle: Minuteman 2.
  • FOT GT112M Follow-on Test launch Nation: USA. Agency: USAF SAC. Apogee: 1,300 km (800 mi). References: 2.
1973 April 19 - 08:59 GMT - Launch Site: Plesetsk. Launch Complex: -. Launch Pad: -. Launch Vehicle: Soyuz. Model: Voskhod 11A57.
  • Cosmos 554 Nation: USSR. Mass: 6,300 kg (13,800 lb). Class: Surveillance. Type: Military. Spacecraft: Zenit-4MK. Agency: MOM. Perigee: 194 km (120 mi). Apogee: 304 km (188 mi). Inclination: 72.90 deg. Period: 89.50 min. COSPAR: 1973-021A. USAF Sat Cat: 6432. Duration: 38.00 days. Decay Date: 1973-05-07. High resolution photo reconnaissance satellite; returned film capsule; maneuverable; exploded in orbit. References: 2, 6.
1973 April 19 - 10:19 GMT - Launch Site: Kapustin Yar. Launch Complex: LC86/4. Launch Pad: -. Launch Vehicle: Kosmos 2. Model: Kosmos 11K63.
  • Intercosmos 9 Nation: USSR. Program: DS. Payload: DS-U2-IK s/n. Mass: 400 kg (880 lb). Class: Earth. Type: Ionosphere. Spacecraft: DS-U2-IK. Agency: IK. Perigee: 199 km (123 mi). Apogee: 1,526 km (948 mi). Inclination: 48.40 deg. Period: 102.20 min. COSPAR: 1973-022A. USAF Sat Cat: 6433. Completed Operations Date: 1973-10-15. Decay Date: 1973-10-15. Also designated Intercosmos Copernicus 500. Investigated solar radio-frequency radiation and the characteristics of the earth's ionosphere. References: 2, 6, 99, 116.
1973 April 20 - 23:47 GMT - Launch Site: Cape Canaveral. Launch Complex: LC17B. Launch Pad: -. Launch Vehicle: Delta. Model: Delta 1914. LV Configuration: Delta 1914 583/D94.
  • Anik A2 Nation: Canada. Program: Anik. Payload: Telesat 2. Mass: 272 kg (599 lb). Class: Communications. Spacecraft: HS 333. Agency: Telesat. Perigee: 35,886 km (22,298 mi). Apogee: 35,952 km (22,339 mi). Inclination: 13.70 deg. Period: 1,442.90 min. COSPAR: 1973-023A. USAF Sat Cat: 6437. Completed Operations Date: 1982-10-28. Anik I and Anik II also registered as United States objects. .The satellites, act as space repeaters capable of receiving transmissions from earth stations and retransmitting them to other earth stations in Canada. The antenna coverage of the satellite pr ovides the capability of serving virtually all of Canada. Anik I and II had weights of 1240.59 lb and 1246.48 lb. Each satellite has 12 RF channels each capable of transmitting a color television signal or up to 900 one-way voice channels. Positioned in geosynchronous orbit over the Americas at 109 deg W in 1973-1979; over the Americas at 106 deg W in 1979-1981; over the Americas at 114 deg W in 1981-1982 As of 26 August 2001 located at 0.59 deg E drifting at 1.690 deg W per day. As of 2007 Mar 9 located at 150.94E drifting at 1.684W degrees per day. References: 2, 6.
1973 April 22 - 18:25 GMT - Launch Site: Syowa Base. Launch Complex: -. Launch Pad: -. Launch Vehicle: S. Model: S-210. LV Configuration: S-210JA-17.
  • Auroral mission Nation: Japan. Agency: NIPR. Apogee: 124 km (77 mi). References: 2.
1973 April 25 - Launch Site: Vandenberg. Launch Complex: LF03. Launch Pad: -. Launch Vehicle: Minuteman 1. Model: Minuteman 1B.
  • HK-2 Nation: USA. Agency: USAF AFSC. Apogee: 1,300 km (800 mi). References: 2.
1973 April 25 - Launch Site: Baikonur. Launch Complex: LC90/19. Launch Pad: LC90/pad?. Launch Vehicle: Tsiklon. Model: Tsiklon-2. FAILURE: Payload propulsion system failed; no orbit.
  • RORSAT failure Nation: USSR. Program: RORSAT. Mass: 3,800 kg (8,300 lb). Class: Surveillance. Type: Naval Radarsat. Spacecraft: US-A. Agency: RVSN. COSPAR: F730425A. Decay Date: 1973-04-25. 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. References: 42, 290.
1973 April 25 - 10:45 GMT - Launch Site: Plesetsk. Launch Complex: -. Launch Pad: -. Launch Vehicle: Soyuz. Model: Voskhod 11A57.
  • Cosmos 555 Nation: USSR. Mass: 6,000 kg (13,200 lb). Class: Surveillance. Type: Military. Spacecraft: Zenit-2M. Agency: MOM. Perigee: 216 km (134 mi). Apogee: 230 km (140 mi). Inclination: 81.00 deg. Period: 88.90 min. COSPAR: 1973-024A. USAF Sat Cat: 6440. Duration: 12.00 days. Decay Date: 1973-05-07. Area survey photo reconnaissance satellite; returned film capsule; separated science capsule. References: 2, 6.
  • Nauka Cosmos 555 Nation: USSR. Payload: Nauka. Spacecraft: Nauka. Agency: MOM. Perigee: 192 km (119 mi). Apogee: 204 km (126 mi). Inclination: 81.30 deg. Period: 88.45 min. COSPAR: 1973-024D. USAF Sat Cat: 6445. Decay Date: 1973-05-09. References: 2, 279.
1973 April 26 - 06:20 GMT - Launch Site: Pacific Ocean. Launch Complex: -. Launch Pad: 27.0 N x 125.0 W. Launch Vehicle: Sandhawk. Model: Hydra Sandhawk.
  • LRL BOX-18 X-ray astronomy mission Nation: USA. Agency: USN NMC. Apogee: 262 km (162 mi). References: 2.
1973 April 27 - Launch Site: Vandenberg. Launch Complex: LF25. Launch Pad: -. Launch Vehicle: Minuteman 3.
  • OT GT21GB operational test launch Nation: USA. Agency: USAF SAC. Apogee: 1,300 km (800 mi). References: 2.
1973 April 27 - 04:50 GMT - Launch Site: Green River. Launch Complex: -. Launch Pad: -. Launch Vehicle: Athena RTV. Model: Athena H. LV Configuration: Athena H H010.
  • RVTO-3B-4 re-entry vehicle test flight Nation: USA. Agency: USAF. Apogee: 200 km (120 mi). References: 2.
1973 April 27 - 04:53 GMT - Launch Site: White Sands. Launch Complex: LC35. Launch Pad: -. Launch Vehicle: Aerobee. Model: Aerobee 150. LV Configuration: Aerobee 150 CRL A03.911-1.
  • Ultraviolet Absorption Aeronomy mission Nation: USA. Agency: AFCRL. Apogee: 121 km (75 mi). References: 2.
1973 April 28 - 22:48 GMT - Launch Site: ETR Launch Area. Launch Complex: -. Launch Pad: -. Launch Vehicle: Poseidon.
  • Demonstration and shakedown operations launch Nation: USA. Agency: USN. Apogee: 500 km (310 mi). References: 2.
1973 April 29 - Launch Site: Baikonur. Launch Complex: LC103. Launch Pad: -. Launch Vehicle: R-36M.
  • State trials missile test Nation: USSR. Agency: RVSN. Apogee: 1,000 km (600 mi). References: 2.
1973 May 1 - Launch Site: Plesetsk. Launch Complex: -. Launch Pad: -. Launch Vehicle: Temp-2S.
  • Test mission Nation: USSR. Agency: RVSN. Apogee: 1,000 km (600 mi). References: 2.
1973 May 3 - 23:00 GMT - Launch Site: Vandenberg. Launch Complex: LF22. Launch Pad: -. Launch Vehicle: Minuteman 3.
  • OT GT22GB operational test launch Nation: USA. Agency: USAF SAC. Apogee: 1,300 km (800 mi). References: 2.
1973 May 4 - Launch Site: Vandenberg. Launch Complex: LF06. Launch Pad: -. Launch Vehicle: Minuteman 1. Model: Minuteman 1B.
  • SSTTP M2-24 Target mission Nation: USA. Agency: USAF AFSC. Apogee: 1,300 km (800 mi). References: 2.
1973 May 5 - 07:00 GMT - Launch Site: Plesetsk. Launch Complex: -. Launch Pad: -. Launch Vehicle: Soyuz. Model: Voskhod 11A57.
  • Cosmos 556 Nation: USSR. Mass: 6,300 kg (13,800 lb). Class: Surveillance. Type: Military. Spacecraft: Zenit-4MK. Agency: MOM. Perigee: 199 km (123 mi). Apogee: 240 km (140 mi). Inclination: 81.30 deg. Period: 88.80 min. COSPAR: 1973-025A. USAF Sat Cat: 6446. Duration: 9.00 days. Decay Date: 1973-05-14. High resolution photo reconnaissance satellite; returned film capsule; maneuverable. References: 2, 6.
1973 May 9 - 23:25 GMT - Launch Site: ETR Launch Area. Launch Complex: -. Launch Pad: -. Launch Vehicle: Poseidon.
  • Demonstration and shakedown operations launch Nation: USA. Agency: USN. Apogee: 500 km (310 mi). References: 2.
1973 May 11 - 00:20 GMT - Launch Site: Baikonur. Launch Complex: LC81/23. Launch Pad: -. Launch Vehicle: Proton. Model: Proton-K. LV Configuration: Proton-K 284-01.
  • Cosmos 557 Nation: USSR. Program: Salyut. Payload: Zarya s/n 123. Mass: 19,400 kg (42,700 lb). Class: Manned. Type: Space station. Spacecraft: Salyut 4. Agency: MOM. Perigee: 206 km (128 mi). Apogee: 225 km (139 mi). Inclination: 51.60 deg. Period: 88.90 min. COSPAR: 1973-026A. USAF Sat Cat: 6498. Duration: 10.98 days. Decay Date: 1973-05-22. Salyut failure. Unsuccessful mission. Salyut out of control. Decayed May 22, 1973. Was to have been manned by initial crew of Leonov and Kubasov. Last chance to upstage Skylab, launched three days later. References: 2, 6, 67, 274.
1973 May 12 - 12:41 GMT - Launch Site: Andoya. Launch Complex: -. Launch Pad: -. Launch Vehicle: Black Brant. Model: Black Brant 5C. LV Configuration: Black Brant VC A-BBVC-51.
  • DLR A-BBVC-51 Erna Aeronomy /ionosphere mission Nation: Germany. Agency: DFVLR. Apogee: 305 km (189 mi). References: 2.
1973 May 14 - 17:30 GMT - Launch Site: Cape Canaveral. Launch Complex: LC39A. Launch Pad: -. Launch Vehicle: Saturn V. Model: Saturn V. LV Configuration: Saturn V-2 SA-513.
  • Skylab 1 Nation: USA. Program: Skylab. Payload: Skylab Orbital Workshop. Mass: 74,783 kg (164,868 lb). Class: Manned. Type: Space station. Spacecraft: Skylab. Agency: NASA MSF. Perigee: 427 km (265 mi). Apogee: 439 km (272 mi). Inclination: 50.00 deg. Period: 93.20 min. COSPAR: 1973-027A. USAF Sat Cat: 6633. Decay Date: 1979-07-11. First and only US space station to date. Project began life as Apollo Orbital Workshop - outfitting of an S-IVB stage with docking adapter with equipment launched by several subsequent S-1B launches. Curtailment of the Apollo moon landings meant that surplus Saturn V's were available, so the pre-equipped, five times heavier, and much more capable Skylab resulted.

    An unexpected telemetry indication of meteoroid shield deployment and solar array wing 2 beam fairing separation was received 1 minute and 3 seconds after liftoff. However, all other systems of the OWS appeared normal, and the OWS was inserted into a near-circular Earth orbit of approximately 435 km altitude. The payload shroud was jettisoned, and the ATM with its solar array was deployed as planned during the first orbit. Deployment of the Workshop solar array and the meteoroid shield was not successful. In fact the xternal solar/meteoroid shield had ripped off 63 seconds into ascent, tearing away one solar panel wing and debris jamming the remaining panel. Without shield temperatures soared in station. Repairs by crews led to virtually all mission objectives being met.

    Following the final manned phase of the Skylab mission, ground controllers performed some engineering tests of certain Skylab systems--tests that ground personnel were reluctant to do while men were aboard. Results from these tests helped to determine causes of failures during the mission and to obtain data on long term degradation of space systems.

    Upon completion of the engineering tests, Skylab was positioned into a stable attitude and systems were shut down. It was expected that Skylab would remain in orbit eight to ten years. It was to have been visited by an early shuttle mission, reboosted into a higher orbit, and used by space shuttle crews. But delays in the first flight of the shuttle made this impossible.

    On July 11, 1979, Skylab disintegrated when it re-entered the earth's atmosphere after a worldwide scare over its pending crash. The debris stretched from the south-east Indian Ocean into Western Australia. Additional Details: Skylab 1. References: 2, 6.

1973 May 16 - 09:19 GMT - Launch Site: Fort Churchill. Launch Complex: -. Launch Pad: -. Launch Vehicle: Black Brant. Model: Black Brant 5B. LV Configuration: Black Brant VB AAF-VB-37.
  • Tower modification test / aeronomy / ionosphere / solar mission Nation: Canada. Agency: NRCC. Apogee: 301 km (187 mi). References: 2.
1973 May 16 - 16:40 GMT - Launch Site: Vandenberg. Launch Complex: SLC4W. Launch Pad: -. Launch Vehicle: Titan. Model: Titan 24B. LV Configuration: Titan 24B 24B-7 (3B-41).
  • OPS 2093 Nation: USA. Payload: KH-8 no. 38 / Agena D. Mass: 3,000 kg (6,600 lb). Class: Surveillance. Type: Military. Spacecraft: KH-8. Agency: NRO/USAF. Perigee: 136 km (84 mi). Apogee: 352 km (218 mi). Inclination: 110.50 deg. Period: 89.40 min. COSPAR: 1973-028A. USAF Sat Cat: 6640. Decay Date: 1973-06-13. KH-8 type satellite. Space craft engaged in investigation of spaceflight techniques and technology (US Cat A). References: 2, 6.
1973 May 17 - 13:19 GMT - Launch Site: Plesetsk. Launch Complex: LC133/1. Launch Pad: -. Launch Vehicle: Kosmos 2. Model: Kosmos 11K63.
  • Cosmos 558 Nation: USSR. Program: DS. Payload: DS-P1-Yu s/n 65. Mass: 400 kg (880 lb). Class: Military. Type: Target. Spacecraft: DS-P1-Yu. Agency: MO SSSR. Perigee: 269 km (167 mi). Apogee: 501 km (311 mi). Inclination: 71.00 deg. Period: 92.30 min. COSPAR: 1973-029A. USAF Sat Cat: 6645. Completed Operations Date: 1973-12-25. Decay Date: 1973-12-22. Development of systems for air defence and the control of outer space. References: 2, 6, 99.
1973 May 18 - 11:00 GMT - Launch Site: Plesetsk. Launch Complex: LC43/3. Launch Pad: -. Launch Vehicle: Soyuz. Model: Soyuz 11A511U.
  • Cosmos 559 Nation: USSR. Mass: 6,300 kg (13,800 lb). Class: Surveillance. Type: Military. Spacecraft: Zenit-4MK. Agency: MOM. Perigee: 204 km (126 mi). Apogee: 325 km (201 mi). Inclination: 65.40 deg. Period: 89.80 min. COSPAR: 1973-030A. USAF Sat Cat: 6647. Duration: 5.00 days. Decay Date: 1973-05-23. First flight of Soyuz U launch vehicle. High resolution photo reconnaissance satellite; returned film capsule; maneuverable. References: 2, 6.
1973 May 18 - 16:00 GMT - Launch Site: White Sands. Launch Complex: LC36. Launch Pad: -. Launch Vehicle: Black Brant. Model: Black Brant 5C. LV Configuration: Black Brant VC NASA 21.19US-GT.
  • Test / aeronomy / solar extreme ultraviolet mission Nation: USA. Agency: NASA. Apogee: 267 km (165 mi). References: 2.
1973 May 19 - 11:11 GMT - Launch Site: South Uist. Launch Complex: -. Launch Pad: -. Launch Vehicle: Petrel. Model: Petrel 1. LV Configuration: Petrel P56H.
  • XRB scintillator tel X-ray astronomy mission Nation: UK. Agency: SRC. Apogee: 137 km (85 mi). References: 2.
1973 May 19 - 23:00 GMT - Launch Site: ETR Launch Area. Launch Complex: -. Launch Pad: -. Launch Vehicle: Poseidon.
  • Demonstration and shakedown operations launch Nation: USA. Agency: USN. Apogee: 500 km (310 mi). References: 2.
1973 May 21 - Launch Site: Kourou. Launch Complex: Diamant. Launch Pad: -. Launch Vehicle: Diamant. Model: Diamant B. LV Configuration: Diamant B No. 5. FAILURE: Failure - fairing did not jettison.
  • Castor (D 5A) Nation: France. Payload: D 5A. Class: Technology. Spacecraft: D. Agency: CNES. COSPAR: F730521A. Decay Date: 1972-05-21. References: 126.
  • Pollux Nation: France. Payload: D-5A. Spacecraft: D. Agency: CNES. COSPAR: F730521B. References: 279.
1973 May 23 - Launch Site: Baikonur. Launch Complex: LC161/35. Launch Pad: -. Launch Vehicle: Tsiklon. Model: R-36 8K67MA.
  • State trials missile test Nation: USSR. Agency: RVSN. Apogee: 1,000 km (600 mi). References: 2.
1973 May 23 - 10:30 GMT - Launch Site: Plesetsk. Launch Complex: -. Launch Pad: -. Launch Vehicle: Soyuz. Model: Voskhod 11A57.
  • Cosmos 560 Nation: USSR. Mass: 6,300 kg (13,800 lb). Class: Surveillance. Type: Military. Spacecraft: Zenit-4M. Agency: MOM. Perigee: 203 km (126 mi). Apogee: 314 km (195 mi). Inclination: 72.90 deg. Period: 89.70 min. COSPAR: 1973-031A. USAF Sat Cat: 6652. Duration: 13.00 days. Decay Date: 1973-06-05. High resolution photo reconnaissance satellite; returned film capsule; maneuverable. References: 2, 6.
1973 May 23 - 16:30 GMT - Launch Site: White Sands. Launch Complex: LC35. Launch Pad: -. Launch Vehicle: Aerobee. Model: Aerobee 150A. LV Configuration: Aerobee 150A NASA 04.235UA.
  • Aeronomy mission Nation: USA. Agency: NASA. Apogee: 111 km (68 mi). References: 2.
1973 May 24 - Launch Site: Baikonur. Launch Complex: LC101. Launch Pad: -. Launch Vehicle: R-36M. FAILURE: Failure.
  • State trials missile test Nation: USSR. Agency: RVSN. Apogee: 0 km ( mi). References: 2.
1973 May 25 - Launch Site: Plesetsk. Launch Complex: LC132/1. Launch Pad: -. Launch Vehicle: Kosmos 3. Model: Kosmos 11K65M. LV Configuration: Kosmos 11K65M 65024-109. FAILURE: Launch vehicle failed to orbit - unknown cause.
  • Zaliv Nation: USSR. Class: Navigation. Spacecraft: Tsiklon. Agency: RVSN. COSPAR: F730525A. References: 2.
1973 May 25 - 05:50 GMT - Launch Site: White Sands. Launch Complex: -. Launch Pad: -. Launch Vehicle: Aerobee. Model: Aerobee 170. LV Configuration: Aerobee 170 NASA 13.75UG.
  • Astronomy mission Nation: USA. Agency: NASA. Apogee: 178 km (110 mi). References: 2.
1973 May 25 - 13:00 GMT - Launch Site: Cape Canaveral. Launch Complex: LC39B. Launch Pad: -. Launch Vehicle: Saturn I. Model: Saturn IB. LV Configuration: Saturn IB SA-206.
  • Skylab 2 Nation: USA. Program: Skylab. Payload: Apollo CSM 116. Mass: 19,979 kg (44,046 lb). Class: Manned. Type: Lunar spacecraft. Spacecraft: Apollo CSM. Location of Spacecraft: National Museum of Naval Aviation, Pensacola, FL. Agency: NASA MSC. Perigee: 425 km (264 mi). Apogee: 440 km (270 mi). Inclination: 50.00 deg. Period: 93.20 min. COSPAR: 1973-032A. USAF Sat Cat: 6655. Duration: 28.03 days. Decay Date: 1973-06-22. Crew: Conrad, Kerwin, Weitz. Flight: Skylab 2. Epic repair mission which brought Skylab into working order. Included such great moments as Conrad being flung through space by the whiplash after heaving on the solar wing just as the debris constraining it gave way; deployment of a lightweight solar shield, developed in Houston in one week, which brought the temperatures down to tolerable levels. With this flight US again took manned spaceflight duration record.

    Skylab 2 , consisting of a modified Apollo CSM payload and a Saturn IB launch vehicle, was inserted into Earth orbit approximately 10 minutes after liftoff. The orbit achieved was 357 by 156 km and, during a six-hour period following insertion, four maneuvers placed the CSM into a 424 by 415 km orbit for rendezvous with the Orbital Workshop. Normal rendezvous sequencing led to stationkeeping during the fifth revolution followed by a flyaround inspection of the damage to the OWS. The crew provided a verbal description of the damage in conjunction with 15 minutes of television coverage. The solar array system wing (beam) 2 was completely missing. The solar array system wing (beam) 1 was slightly deployed and was restrained by a fragment of the meteoroid shield. Large sections of the meteoroid shield were missing. Following the flyaround inspection, the CSM soft-docked with the OWS at 5:56 p.m. EDT to plan the next activities. At 6:45 p.m. EDT the CSM undocked and extravehicular activity was initiated to deploy the beam 1 solar array. The attempt failed. Frustration of the crew was compounded when eight attempts were required to achieve hard docking with the OWS. The hard dock was made at 11:50 p.m. EDT, terminating a Skylab 2 first-day crew work period of 22 hours. References: 2, 6, 33,60.

1973 May 25 - 13:30 GMT - Launch Site: Plesetsk. Launch Complex: -. Launch Pad: -. Launch Vehicle: Soyuz. Model: Voskhod 11A57.
  • Cosmos 561 Nation: USSR. Mass: 6,000 kg (13,200 lb). Class: Surveillance. Type: Military. Spacecraft: Zenit-2M. Agency: MOM. Perigee: 206 km (128 mi). Apogee: 295 km (183 mi). Inclination: 65.40 deg. Period: 89.50 min. COSPAR: 1973-033A. USAF Sat Cat: 6657. Duration: 12.00 days. Decay Date: 1973-06-06. Area survey photo reconnaissance satellite; returned film capsule; separated gamma ray telescope experiment capsule. References: 2, 6.
  • Nauka Cosmos 561 Nation: USSR. Payload: Nauka. Spacecraft: Nauka. Agency: MOM. Perigee: 205 km (127 mi). Apogee: 281 km (174 mi). Inclination: 65.30 deg. Period: 89.36 min. COSPAR: 1973-033D. USAF Sat Cat: 6662. Decay Date: 1973-06-20. References: 2, 279.
1973 May 25 - 15:20 GMT - Launch Site: Natal. Launch Complex: -. Launch Pad: -. Launch Vehicle: Sergeant. Model: Castor Lance. LV Configuration: Castor Lance CRL A44.320-01.
  • Infrared Radiometer Aeronomy infrared mission Nation: USA. Agency: AFCRL. Apogee: 569 km (353 mi). References: 2.
1973 May 26 - 00:40 GMT -
  • EVA Skylab 2-1 Nation: USA. Program: Skylab. Class: Manned. Type: Lunar spacecraft. Spacecraft: Apollo CSM. Crew: Weitz. Flight: Skylab 2. EVA Duration: 0.0257 days. First and failed attempt to release jammed solar panel. References: 66.
1973 May 29 - 10:16 GMT - Launch Site: Plesetsk. Launch Complex: -. Launch Pad: -. Launch Vehicle: Soyuz. Model: Vostok 8A92M.
  • Meteor 1-15 Nation: USSR. Payload: Meteor M no. 15. Mass: 3,800 kg (8,300 lb). Class: Earth. Type: Weather. Spacecraft: Meteor M. Agency: MOM. Perigee: 845 km (525 mi). Apogee: 879 km (546 mi). Inclination: 81.20 deg. Period: 102.20 min. COSPAR: 1973-034A. USAF Sat Cat: 6659. Acquisition of meteorological information needed for use by the weather service. References: 2, 6.
1973 May 29 - 20:05 GMT - Launch Site: Kapustin Yar. Launch Complex: V-2. Launch Pad: -. Launch Vehicle: MR-12.
  • Aeronomy mission? Nation: USSR. Agency: AN SSSR. Apogee: 162 km (100 mi). References: 2.
1973 May 31 - Launch Site: Vandenberg. Launch Complex: LF09. Launch Pad: LF09?. Launch Vehicle: Minuteman 3. LV Configuration: Minuteman 3 PVM-4.
  • PVM-4 test Nation: USA. Agency: USAF AFSC. Apogee: 1,300 km (800 mi). References: 2.
1973 June 1 - Launch Site: Plesetsk. Launch Complex: -. Launch Pad: -. Launch Vehicle: Temp-2S.
  • Test mission Nation: USSR. Agency: RVSN. Apogee: 1,000 km (600 mi). References: 2.
1973 June 1 - Launch Site: Baikonur. Launch Complex: -. Launch Pad: -. Launch Vehicle: UR-100N. Model: UR-100N.
  • State trials missile test Nation: USSR. Agency: RVSN. Apogee: 1,000 km (600 mi). References: 2.
1973 June 2 - 16:51 GMT - Launch Site: White Sands. Launch Complex: -. Launch Pad: -. Launch Vehicle: Aerobee. Model: Aerobee 170A. LV Configuration: Aerobee 170A NASA 13.97CS.
  • Solar mission Nation: USA. Agency: NASA. Apogee: 175 km (108 mi). References: 2.
1973 June 3 - 1973 June 4 - 17:10 GMT - Launch Site: White Sands. Launch Complex: LC36. Launch Pad: -. Launch Vehicle: Black Brant. Model: Black Brant 5C. LV Configuration: Black Brant VC NASA 21.21NP-US. FAILURE: Failure.
  • CALROC 1 Solar extreme ultraviolet mission Nation: USA. Agency: NASA. Apogee: 132 km (82 mi). References: 2.
1973 June 5 - Launch Site: Baikonur. Launch Complex: LC173. Launch Pad: -. Launch Vehicle: MR-UR-100. Model: MR-UR-100. FAILURE: Failure.
  • State trials missile test Nation: USSR. Agency: RVSN. Apogee: 0 km ( mi). References: 2.
1973 June 5 - 11:29 GMT - Launch Site: Plesetsk. Launch Complex: LC133/1. Launch Pad: -. Launch Vehicle: Kosmos 2. Model: Kosmos 11K63.
  • Cosmos 562 Nation: USSR. Program: DS. Payload: DS-P1-Yu s/n 66. Mass: 400 kg (880 lb). Class: Military. Type: Target. Spacecraft: DS-P1-Yu. Agency: MO SSSR. Perigee: 270 km (160 mi). Apogee: 483 km (300 mi). Inclination: 70.00 deg. Period: 92.00 min. COSPAR: 1973-035A. USAF Sat Cat: 6665. Completed Operations Date: 1974-01-08. Decay Date: 1974-01-07. Development of systems for air defence and the control of outer space. References: 2, 6, 99.
1973 June 6 - 11:30 GMT - Launch Site: Plesetsk. Launch Complex: -. Launch Pad: -. Launch Vehicle: Soyuz. Model: Voskhod 11A57.
  • Cosmos 563 Nation: USSR. Mass: 6,300 kg (13,800 lb). Class: Surveillance. Type: Military. Spacecraft: Zenit-4M. Agency: MOM. Perigee: 206 km (128 mi). Apogee: 298 km (185 mi). Inclination: 65.40 deg. Period: 89.50 min. COSPAR: 1973-036A. USAF Sat Cat: 6667. Duration: 12.00 days. Decay Date: 1973-06-18. High resolution photo reconnaissance satellite; returned film capsule; maneuverable. References: 2, 6.
1973 June 7 - Launch Site: Vandenberg. Launch Complex: LF06. Launch Pad: -. Launch Vehicle: Minuteman 1. Model: Minuteman 1B.
  • SSTTP M2-22 Target mission Nation: USA. Agency: USAF SAC. Apogee: 1,300 km (800 mi). References: 2.
1973 June 7 - 15:15 GMT -
  • EVA Skylab 2-2 Nation: USA. Program: Skylab. Class: Manned. Type: Space station. Spacecraft: Skylab. Crew: Conrad, Kerwin. Flight: Skylab 2. EVA Duration: 0.15 days. Succeeded in release of jammed solar panel. References: 66.
1973 June 8 - 15:50 GMT - Launch Site: Plesetsk. Launch Complex: LC132/1. Launch Pad: -. Launch Vehicle: Kosmos 3. Model: Kosmos 11K65M. LV Configuration: Kosmos 11K65M 53753-210.
  • Cosmos 564 Nation: USSR. Program: Strela. Payload: Strela-1M no. 41. Mass: 40 kg (88 lb). Class: Communications. Type: Military Store-dump. Spacecraft: Strela-1M. Agency: MO SSSR. Perigee: 1,395 km (866 mi). Apogee: 1,480 km (910 mi). Inclination: 74.00 deg. Period: 114.60 min. COSPAR: 1973-037A. USAF Sat Cat: 6675. Eight satellites launched by a single carrier rocket. References: 2, 6.
  • Cosmos 565 Nation: USSR. Program: Strela. Payload: Strela-1M no. 42. Mass: 40 kg (88 lb). Class: Communications. Type: Military Store-dump. Spacecraft: Strela-1M. Agency: MO SSSR. Perigee: 1,449 km (900 mi). Apogee: 1,489 km (925 mi). Inclination: 74.00 deg. Period: 115.30 min. COSPAR: 1973-037B. USAF Sat Cat: 6676. References: 2, 6.
  • Cosmos 566 Nation: USSR. Program: Strela. Payload: Strela-1M no. 43. Mass: 40 kg (88 lb). Class: Communications. Type: Military Store-dump. Spacecraft: Strela-1M. Agency: MO SSSR. Perigee: 1,433 km (890 mi). Apogee: 1,482 km (920 mi). Inclination: 74.00 deg. Period: 115.10 min. COSPAR: 1973-037C. USAF Sat Cat: 6677. References: 2, 6.
  • Cosmos 567 Nation: USSR. Program: Strela. Payload: Strela-1M no. 44. Mass: 40 kg (88 lb). Class: Communications. Type: Military Store-dump. Spacecraft: Strela-1M. Agency: MO SSSR. Perigee: 1,412 km (877 mi). Apogee: 1,483 km (921 mi). Inclination: 74.00 deg. Period: 114.80 min. COSPAR: 1973-037D. USAF Sat Cat: 6678. References: 2, 6.
  • Cosmos 568 Nation: USSR. Program: Strela. Payload: Strela-1M no. 45. Mass: 40 kg (88 lb). Class: Communications. Type: Military Store-dump. Spacecraft: Strela-1M. Agency: MO SSSR. Perigee: 1,375 km (854 mi). Apogee: 1,480 km (910 mi). Inclination: 74.00 deg. Period: 114.40 min. COSPAR: 1973-037E. USAF Sat Cat: 6679. References: 2, 6.
  • Cosmos 569 Nation: USSR. Program: Strela. Payload: Strela-1M no. 46. Mass: 40 kg (88 lb). Class: Communications. Type: Military Store-dump. Spacecraft: Strela-1M. Agency: MO SSSR. Perigee: 1,358 km (843 mi). Apogee: 1,480 km (910 mi). Inclination: 74.00 deg. Period: 114.20 min. COSPAR: 1973-037F. USAF Sat Cat: 6680. References: 2, 6.
  • Cosmos 570 Nation: USSR. Program: Strela. Payload: Strela-1M no. 47. Mass: 40 kg (88 lb). Class: Communications. Type: Military Store-dump. Spacecraft: Strela-1M. Agency: MO SSSR. Perigee: 1,337 km (830 mi). Apogee: 1,481 km (920 mi). Inclination: 74.00 deg. Period: 114.00 min. COSPAR: 1973-037G. USAF Sat Cat: 6681. References: 2, 6.
  • Cosmos 571 Nation: USSR. Program: Strela. Payload: Strela-1M no. 48. Mass: 40 kg (88 lb). Class: Communications. Type: Military Store-dump. Spacecraft: Strela-1M. Agency: MO SSSR. Perigee: 1,319 km (819 mi). Apogee: 1,479 km (919 mi). Inclination: 74.00 deg. Period: 113.80 min. COSPAR: 1973-037H. USAF Sat Cat: 6682. References: 2, 6.
1973 June 10 - 10:10 GMT - Launch Site: Baikonur. Launch Complex: LC1. Launch Pad: LC1 or LC31. Launch Vehicle: Soyuz. Model: Voskhod 11A57.
  • Cosmos 572 Nation: USSR. Mass: 6,000 kg (13,200 lb). Class: Surveillance. Type: Military. Spacecraft: Zenit-4M. Agency: MOM. Perigee: 206 km (128 mi). Apogee: 281 km (174 mi). Inclination: 51.70 deg. Period: 89.30 min. COSPAR: 1973-038A. USAF Sat Cat: 6684. Duration: 13.00 days. Decay Date: 1973-06-23. High resolution photo reconnaissance satellite; returned film capsule; maneuverable. References: 2, 6.
1973 June 10 - 14:13 GMT - Launch Site: Cape Canaveral. Launch Complex: LC17B. Launch Pad: -. Launch Vehicle: Delta. Model: Delta 1913. LV Configuration: Delta 1913 581/D95.
  • Explorer 49 Nation: USA. Program: Explorer. Payload: RAE B. Mass: 328 kg (723 lb). Class: Astronomy. Spacecraft: RAE. Agency: NASA GSF. COSPAR: 1973-039A. USAF Sat Cat: 6686. Radio Astronomy Explorer; measured galactic, stellar radio noise. Lunar Orbit (Selenocentric). Spacecraft engaged in research and exploration of the upper atmosphere or outer space (US Cat B). References: 2, 6.
1973 June 10 - 17:20 GMT - Launch Site: Syowa Base. Launch Complex: -. Launch Pad: -. Launch Vehicle: S. Model: S-210. LV Configuration: S-210JA-13.
  • Auroral mission Nation: Japan. Agency: NIPR. Apogee: 123 km (76 mi). References: 2.
1973 June 11 - 18:10 GMT - Launch Site: Syowa Base. Launch Complex: -. Launch Pad: -. Launch Vehicle: S. Model: S-210. LV Configuration: S-210JA-15.
  • Auroral mission Nation: Japan. Agency: NIPR. Apogee: 125 km (77 mi). References: 2.
1973 June 11 - 18:30 GMT - Launch Site: White Sands. Launch Complex: -. Launch Pad: -. Launch Vehicle: Aerobee. Model: Aerobee 200A. LV Configuration: Aerobee 200A NASA 26.02CS.
  • Solar mission Nation: USA. Agency: NASA. Apogee: 221 km (137 mi). References: 2.
1973 June 12 - 01:54 GMT - Launch Site: Kapustin Yar. Launch Complex: V-2. Launch Pad: -. Launch Vehicle: MR-12.
  • Aeronomy mission Nation: USSR. Apogee: 70 km (43 mi). References: 2.
1973 June 12 - 07:14 GMT - Launch Site: Cape Canaveral. Launch Complex: LC40. Launch Pad: -. Launch Vehicle: Titan. Model: Titan 3C. LV Configuration: Titan IIIC 23C-6 (3C-24).
  • IMEWS 4 Nation: USA. Payload: DSP Phase 1 s/n 4. Mass: 900 kg (1,980 lb). Class: Early Warning. Spacecraft: DSP. Agency: USAF. Perigee: 35,777 km (22,230 mi). Apogee: 35,786 km (22,236 mi). Inclination: 0.30 deg. Period: 1,435.90 min. COSPAR: 1973-040A. USAF Sat Cat: 6691. Completed Operations Date: 1980-11-01. First generation geosynchronous ballistic missile launch detection satellite, remained in service for over seven years. Positioned in geosynchronous orbit over the Indian Ocean at 75E in 1973; over the Americas at 105 deg W in 1979-1980. As of 1983 Jan 3 located at 73.21W drifting at 1.648W degrees per day. References: 2, 6, 127.
1973 June 12 - 16:09 GMT - Launch Site: Fort Churchill. Launch Complex: -. Launch Pad: -. Launch Vehicle: Tomahawk Sandia. Model: Ute Tomahawk. LV Configuration: Ute Tomahawk CRL A09.210-1.
  • D / E region ions Aeronomy / plasma mission Nation: USA. Agency: USAF CRL. Apogee: 124 km (77 mi). References: 2.
1973 June 12 - 16:17 GMT - Launch Site: Fort Churchill. Launch Complex: -. Launch Pad: -. Launch Vehicle: Tomahawk Sandia. Model: Ute Tomahawk. LV Configuration: Ute Tomahawk CRL A09.210-2.
  • D / E region ions Aeronomy / plasma mission Nation: USA. Agency: USAF CRL. Apogee: 125 km (77 mi). References: 2.
1973 June 13 - 17:38 GMT - Launch Site: White Sands. Launch Complex: LC36. Launch Pad: -. Launch Vehicle: Black Brant. Model: Black Brant 5C. LV Configuration: Black Brant VC NASA 21.12DS-NP.
  • Solar Ultraviolet/Solar X-ray mission Nation: USA. Agency: NASA. Apogee: 241 km (149 mi). References: 2.
1973 June 15 - 06:00 GMT - Launch Site: Baikonur. Launch Complex: LC1. Launch Pad: -. Launch Vehicle: Soyuz. Model: Soyuz 11A511.
  • Cosmos 573 Nation: USSR. Program: Salyut. Payload: Soyuz 7K-T s/n 35. Mass: 6,675 kg (14,715 lb). Class: Manned. Type: Spacecraft. Spacecraft: Soyuz 7K-T. Agency: MOM. Perigee: 191 km (118 mi). Apogee: 308 km (191 mi). Inclination: 51.60 deg. Period: 89.50 min. COSPAR: 1973-041A. USAF Sat Cat: 6694. Duration: 2.00 days. Decay Date: 1973-06-17. Soyuz test flight. Recovered June 17, 1973 6:01 GMT. Soyuz 7K-T redesign test, probably using one of the spacecraft allocated to the failed Salyut 2 or Cosmos 557 stations. References: 2, 6.
1973 June 16 - Launch Site: Baikonur. Launch Complex: LC104. Launch Pad: -. Launch Vehicle: R-36M.
  • State trials missile test Nation: USSR. Agency: RVSN. Apogee: 1,000 km (600 mi). References: 2.
1973 June 16 - 10:30 GMT - Launch Site: Woomera. Launch Complex: LA2. Launch Pad: LA2 SL. Launch Vehicle: Skylark. Model: Skylark 6 AC. LV Configuration: Skylark 6 AC SL1111.
  • Far ultraviolet OGS Ultraviolet astronomy mission Nation: UK. Agency: BAC. Apogee: 227 km (141 mi). References: 2.
1973 June 19 - 10:55 GMT -
  • EVA Skylab 2-3 Nation: USA. Program: Skylab. Class: Manned. Type: Space station. Spacecraft: Skylab. Crew: Conrad, Weitz. Flight: Skylab 2. EVA Duration: 0.0722 days. Replacement of film cartridges for solar camera. References: 66.
1973 June 20 - 06:16 GMT - Launch Site: Plesetsk. Launch Complex: LC132/1. Launch Pad: -. Launch Vehicle: Kosmos 3. Model: Kosmos 11K65M. LV Configuration: Kosmos 11K65M 53724-116.
  • Cosmos 574 Nation: USSR. Mass: 550 kg (1,210 lb). Class: Navigation. Spacecraft: Tsiklon. Agency: MO SSSR. Perigee: 976 km (606 mi). Apogee: 1,010 km (620 mi). Inclination: 83.00 deg. Period: 105.00 min. COSPAR: 1973-042A. USAF Sat Cat: 6707. Military navigation satellite. References: 2, 6.
1973 June 21 - Launch Site: Baikonur. Launch Complex: LC177. Launch Pad: -. Launch Vehicle: MR-UR-100. Model: MR-UR-100.
  • State trials missile test Nation: USSR. Agency: RVSN. Apogee: 1,000 km (600 mi). References: 2.
1973 June 21 - 10:30 GMT - Launch Site: Barking Sands. Launch Complex: -. Launch Pad: -. Launch Vehicle: Black Brant. Model: Black Brant 4B. LV Configuration: Black Brant IVB APF-4B-30.
  • Galactic X-rays X-ray astronomy mission Nation: Canada. Agency: NRCC. Apogee: 686 km (426 mi). References: 2.
1973 June 21 - 13:29 GMT - Launch Site: Plesetsk. Launch Complex: -. Launch Pad: -. Launch Vehicle: Soyuz. Model: Voskhod 11A57.
  • Cosmos 575 Nation: USSR. Mass: 6,000 kg (13,200 lb). Class: Surveillance. Type: Military. Spacecraft: Zenit-2M. Agency: MOM. Perigee: 204 km (126 mi). Apogee: 271 km (168 mi). Inclination: 65.40 deg. Period: 89.30 min. COSPAR: 1973-043A. USAF Sat Cat: 6709. Duration: 12.00 days. Decay Date: 1973-07-03. Area survey photo reconnaissance satellite; returned film capsule; separated capsule. References: 2, 6.
1973 June 22 -
  • Landing of Skylab 2 Nation: USA. Program: Skylab. Flight: Skylab 2. Skylab 2 landed at 13:49 GMT.
1973 June 22 - Launch Site: Kwajalein. Launch Complex: Meck. Launch Pad: -. Launch Vehicle: Spartan. LV Configuration: Spartan ABM 800038.
  • SAFEGUARD M2-45 Interceptor mission Nation: USA. Agency: USA. Apogee: 340 km (210 mi). References: 2.
1973 June 22 - Launch Site: Kwajalein. Launch Complex: Meck. Launch Pad: -. Launch Vehicle: Spartan. LV Configuration: Spartan ABM PFT-01.
  • SAFEGUARD M2-45 Interceptor mission Nation: USA. Agency: USA. Apogee: 347 km (215 mi). References: 2.
1973 June 23 - 10:45 GMT - Launch Site: Barking Sands. Launch Complex: LC12. Launch Pad: -. Launch Vehicle: Sandhawk. Model: Terrier Sandhawk. LV Configuration: Terrier Sandhawk Sandia 281-32.
  • LRL ACS-4E (ACS-9) X-ray astronomy mission Nation: USA. Agency: Sandia. Apogee: 297 km (184 mi). References: 2.
1973 June 26 - Launch Site: Vandenberg. Launch Complex: SLC4W. Launch Pad: -. Launch Vehicle: Titan. Model: Titan 24B. LV Configuration: Titan 24B 24B-9 (3B-43). FAILURE: Agena upper stage failed to orbit.
  • OPS 4018 Nation: USA. Payload: KH-8 no. 39 / Agena D. Mass: 3,000 kg (6,600 lb). Class: Surveillance. Type: Military. Spacecraft: KH-8. Agency: USAF. COSPAR: F730626AA. Decay Date: 1973-06-26. References: 126.
1973 June 26 - 01:22 GMT - Launch Site: Plesetsk. Launch Complex: LC132/1. Launch Pad: -. Launch Vehicle: Kosmos 3. Model: Kosmos 11K65M. LV Configuration: Kosmos 11K65M Yu47121-16. FAILURE: Nine persons were killed in the explosion of the vehicle.
  • Nine killed in fuelling accident at Plesetsk Nation: USSR. Program: Tselina. Class: Sigint. Spacecraft: Tselina-O. Agency: RVSN. COSPAR: F730626BA. Nine were killed at the LC-133 Voskhod complex during preparation of a Kosmos-3M booster. Oxidiser and propellant were accidentally mixed together during fuelling. References: 2, 279.
1973 June 26 - 17:00 GMT - Launch Site: Vandenberg. Launch Complex: SLC4W. Launch Pad: -. Launch Vehicle: Titan. Model: Titan 24B. LV Configuration: Titan 24B 3B-43 (24B-9). FAILURE: Failure.
  • SRV-1 Nation: USA. Spacecraft: KH-8. Agency: USAF. COSPAR: F730626AC. References: 279.
  • SRV-2 Nation: USA. Spacecraft: KH-8. Agency: USAF. COSPAR: F730626AD. References: 279.
1973 June 27 - Launch Site: Vandenberg. Launch Complex: LF07. Launch Pad: -. Launch Vehicle: Minuteman 2.
  • FOT GT114M Follow-on Test launch Nation: USA. Agency: USAF SAC. Apogee: 1,300 km (800 mi). References: 2.
1973 June 27 - 11:50 GMT - Launch Site: Plesetsk. Launch Complex: -. Launch Pad: -. Launch Vehicle: Soyuz. Model: Soyuz 11A511M.
  • Cosmos 576 Nation: USSR. Mass: 6,000 kg (13,200 lb). Class: Surveillance. Type: Military. Spacecraft: Zenit-4MT. Agency: MOM. Perigee: 204 km (126 mi). Apogee: 332 km (206 mi). Inclination: 72.90 deg. Period: 89.80 min. COSPAR: 1973-044A. USAF Sat Cat: 6713. Duration: 12.00 days. Decay Date: 1973-07-09. Military topography satellite; returned film capsule; separated science capsule. References: 2, 6.
1973 June 29 - Launch Site: Kheysa. Launch Complex: -. Launch Pad: -. Launch Vehicle: MR-12.
  • FEYERVERK Active Plasma mission Nation: USSR. Agency: IZMIRAN. Apogee: 120 km (70 mi). References: 2.
1973 June 29 - 11:59 GMT - Launch Site: South Uist. Launch Complex: -. Launch Pad: -. Launch Vehicle: Petrel. Model: Petrel 1. LV Configuration: Petrel P162H.
  • Composition Ionosphere mission Nation: UK. Agency: SRC. Apogee: 140 km (80 mi). References: 2.
1973 June 30 - 10:30 GMT - Launch Site: Atlantic Ocean. Launch Complex: -. Launch Pad: 50.0 N x 30.0 W. Launch Vehicle: MR-12.
  • Eclipse mission Nation: USSR. Agency: AN SSSR. Apogee: 150 km (90 mi). References: 2.
1973 June 30 - 10:33 GMT - Launch Site: Nouadhibou. Launch Complex: -. Launch Pad: -. Launch Vehicle: Aerobee. Model: Aerobee 170. LV Configuration: Aerobee 170 KP3.41.
  • Coronal spectrograph Solar ultraviolet / eclipse mission Nation: USA. Agency: KPNO. Apogee: 180 km (110 mi). References: 2.
1973 June 30 - 13:07 GMT - Launch Site: San Marco. Launch Complex: -. Launch Pad: -. Launch Vehicle: Tomahawk Sandia. Model: Nike Tomahawk.
  • Solar extreme ultraviolet mission Nation: Italy. Agency: ISRC. Apogee: 270 km (160 mi). References: 2.

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