Goddard's test engine produced 4 pounds thrust for a brief period. References: 377 .
Aerobee 150-A, a new type, fired from new launch tower at Wallops Station, reached an altitude of 140 km and achieved rocket performance objectives as well as micrometeorite impact counts. References: 17 .
Carried dog Zvezdochka and mannequin Ivan Ivanovich. Ivanovich was again ejected from the capsule and recovered by parachute, and Zvezdochka was successfully recovered with the capsule on March 25, 1961 7:40 GMT.
Officially: Development of the design of the space ship satellite and of the systems on board, designed to ensure man's life functions during flight in outer space and return to Earth. References: 1 , 2 , 5 , 6 , 175 .
The Boeing Company received NASA's go-ahead to develop the Lunar Orbiter spacecraft. Two significant changes were made in the original Statement of Work:
The first flight-model ALSEP arrived at KSC, where it would undergo software integration tests and be prepared for installation in the LM. References: 16 .
Test flight of new booster based on SS-25 ICBM. Full-scale mock-up (actual weight) for the flight-design testing of the Start-1 carrier rocket. Experimental satellite launched by a Start-1 carrier rocket from the Plesetsk launch site. References: 1 , 2 , 5 , 6 .
US Navy communications; Ultra High Frequency Follow On; unusable orbit. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Launch vehicle was to have put payload into subsynchronous earth orbit with MRS trajectory option. References: 1 , 2 , 5 , 6 , 278 .
Plane 4. Ascending node 262.5 degrees.
Plane 4. Ascending node 262.5 degrees. Not in service.
Imager for Magnetopause to Aurora Global Exploration was a MIDEX (mid-sized Explorer mission) developed by NASA-Goddard and the SWRI (Southwest Research Institute) of San Antonio, Texas. The spin-stabilised spacecraft carried a set of neutral atom and ultraviolet imagers, and antennae to study radio wavelength emissions from the magnetosphere plasma. The RPI radio plasma imager has four long wire antennae which will be deployed to a span of half a kilometre.