Flight of Goddard liquid fuel rocket with pressure generated by liquid nitrogen, and eight gyro-controlled vanes (four into blast and four into slipstream) for stabilisation. Length 10 ft 9.5 in.; weight empty 19.5 lb; height 135 ft; in air 5 sec. References: 17 , 482 .
Project MX-774 inaugurated by AAF with Consolidated-Vultee to study rocket capabilities with an ICBM as a final objective. References: 17 .
Launched 12:54 local time. Reached 56.1 km. Carried cosmic and solar radiation, pressure, temperature experiments for Naval Research Lab.
Of the 8 rockets of the first production lot fired, 6 reached the target area.
Douglas Thor IRBM (XSM-75) was launched at Cape Canaveral, Fla., destroyed by range safety officer. The missile was actually on course throughout its flight. The console wiring error led the range safety officer to believe it was headed inland rather than out to sea, so he hit the destruct button.
Launched after prior 20 Februry flight attempt. The suspect booster was replaced. Successful flight lasting T+33.5 minutes, achieving a range of 1,766 km and a speed of Mach 3.15 at 17.0 km altitude.
This dramatic failure resulted in a loss of thrust, and the lateral strap-on units separated and flew over the tracking stations and living areas. The core continued on its trajectory. References: 5 , 175 , 445 .
Last of three successful Atlas/Prime missions from Vandenberg AFB (first launch on 21 December 1966). References: 88 .
First of manned space station; deorbited after 175 days in space, on October 16, 1971.
186km X 220km orbit to 253km X 276km orbit. Delta V: 35 m/s
198km X 204km orbit to 187km X 221km orbit. Delta V: 8 m/s
188km X 215km orbit to 208km X 217km orbit. Delta V: 5 m/s
208km X 212km orbit to 210km X 235km orbit. Delta V: 6 m/s
206km X 227km orbit to 225km X 262km orbit. Delta V: 15 m/s
225km X 262km orbit to 257km X 264km orbit. Delta V: 9 m/s
222km X 237km orbit to 238km X 284km orbit. Delta V: 17 m/s
200km X 237km orbit to 226km X 292km orbit. Delta V: 23 m/s
201km X 251km orbit to 248km X 299km orbit. Delta V: 27 m/s
248km X 229km orbit to 285km X 314km orbit. Delta V: 34 m/s
265km X 300km orbit to 221km X 266km orbit. Delta V: 21 m/s
177km X 182km orbit to 177km X 20km orbit. Delta V: 48 m/s
Total Delta V: 200/248 m/s.
Officially: Testing of design elements and on-board systems; conduct of research and experiments in space flight. Testing of design elements and on-board systems; conduct of research and experiments in space flight. References: 1 , 2 , 5 , 6 , 67 , 274 .
Solar radition monitor. Name is 'Intercosmos Copernicus 500'. Investigation of solar radio-frequency radiation and the characteristics of the earth's ionosphere. References: 1 , 2 , 5 , 6 , 99 , 116 .
Deployed from Salyut 7 5/17/82. Launched from Salyut 7. Experiments in amateur radio communications. Launched into orbit from aboard the Salyut-7 orbital scientific station. References: 1 , 2 , 5 , 6 , 67 , 274 .
Second Soviet replenishable long-duration ‘civilian’ space station. Objectives: Continuation of scientific research on board manned space complexes in the interests of science and the Soviet national economy; testing of advanced systems and apparatus for orbital stations. Continuation of the scientific research in progress on board manned space complexes in the interests of science and the national economy; testing of advanced systems and apparatus for orbital stations. Although of the same design as Salyut 6, technical breakdowns throughout its life made Salyut 7 a much less productive station. Replaced finally by Mir. Two different TKS resupply craft, originally designed for the Almaz military station, docked with Salyut 7 to provide a larger complex. With the cancellation of Almaz, a large proportion of the experiments carried out on board had military objectives. As of January 1990 out of fuel, unable to manoeuvre, uncontrolled re-entry expected in three to four years. Re-entered in 1991 with 70 kg fuel remaining over Argentina. Controllers attempted to control impact point (set for Atlantic Ocean) by setting Salyut 7/Kosmos 1686 assembly into a tumble. This however failed and Salyut 7 re-entered February 7, 1991 04:00 GMT. Many fragments fell on the town of Capitan Bermudez, 25 km from Rosario and 400 km from Buenos Aires, Argentina. At 1 am local time the sky was lit up with hundreds of incandescent meteors travelling from Southwest to Northeast. At dawn the inhabitants discovered numerous metal fragments, which seemed to have fallen in distinct groups at various locations in the city. Luckily no one was hurt in the metallic shower. Additional Details: Salyut 7. References: 1 , 2 , 5 , 6 , 67 , 274 , 299 .
Tens of thousands of Chinese students take over Beijing's Tiananmen Square in rally for democracy
Began installation of Kvant 1 solar array drive unit. References: 66 .
Galaxy 4R carried 28 Ku-band and 28 C-band transponders. After insertion in a standard 219 x 32007 km x 7.0 deg geostationary transfer orbit, Galaxy 4R's R-4D apogee engine raised orbit to 35765 x 35792 km x 0.1 deg by April 27 and was over 67 deg W by late April. Final destination was 99 deg W. The Galaxy satellites provide US domestic telecommunications services. 4R replaces the original Galaxy 4H which failed in May 1998, putting pagers out of action across the USA. Stationed at 99 deg W.