Failed in the first stage. Vehicle was supposed to obtain cosmic ray data at altitudes unattainable by other rockets. V-2 reached 50 km, 790 m/s; WAC destroyed.
First launcing of USAF Aerobee-Hi sounding rocket. Rocket test, 98 kg payload. Launched at 0858 local time. Reached 198 km.
Radiation monitoring. References: 279 .
Operation of a system of long range telephone-telegraph radiocommunication, and transmission of USSR Central Television programmes to the stations of the Orbita network. References: 1 , 2 , 5 , 6 , 64 .
The Director of Apollo Test in the NASA Hq. Apollo Program Office, LeRoy E. Day, was detailed to head the MSF Space Shuttle Task Group. The group would provide NASA with material for a report on the Space Shuttle to the President's Space Task Group. References: 16 .
Explored lunar surface near LM and deployed ALSEP unmanned scientific station equipment. References: 66 .
First static firing, MPTA-098, NSTL (2.5 seconds; stub nozzles) References: 15 .
Unmanned supply vessel to Mir. Deorbited May 11, 1987. Docked with Mir at 343 X 363 1705 23 April at rear port of Kvant. Undocked May 11 03:10. Deorbited28 May 02:59 .
Officially: Transporting sundry cargoes to the Mir orbital station. Docked with Salyut 7 on 23 Apr 1987 17:04:51 GMT. Undocked on 11 May 1987 03:10:01 GMT. Destroyed in reentry on 11 May 1987 08:28:00 GMT. Total free-flight time 2.30 days. Total docked time 17.42 days. References: 1 , 2 , 6 , 275 .
Operation of the long-range telephone and telegraph radio communications system, transmission of television programmes to stations in the Orbita network and international cooperation. References: 1 , 2 , 5 , 6 .
Minisat-01 carried the EURD extreme ultraviolet spectrograph to study interstellar gas, the LEGRI gamma ray burst detector, and the CPLM microacceleration in liquids experiment. References: 4 .
First launch of Russia's Dnepr launch vehicle, a converted R-36M2 ICBM. The Dnepr was launched from a silo. The third stage maneuvring bus (used on the ICBM for dispensing multiple warheads) placed UoSAT-12 into a 638 km x 652 km x 64.6 deg orbit. The third stage separated from the payload at 05:13 GMT and then made a burn into a 599 km x 1403 km x 64.6 deg orbit. UoSAT-12 was the first test of the Minibus platform, at 325 kg a larger spacecraft than earlier 50 kg Surrey UoSATs. It carried a mobile radio experiment (MERLION), a GPS receiver, and imaging cameras.