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• Mercury-Atlas_4 abstract "Mercury-Atlas 4 was an unmanned spaceflight of the Mercury program. It was launched on September 13, 1961 at 14:09 UTC from Launch Complex 14 at Cape Canaveral, Florida. A Crewman Simulator instrument package was aboard. The craft orbited the Earth once.At this time, NASA was getting increasingly frustrated with the Atlas's poor launch record. Of four Mercury-Atlas flights so far, two (MA-1 and MA-3) had been total failures. One (Big Joe) had been a partial success and the otherwise completely successful MA-2 had experienced propellant slosh problems. In addition, the Atlas had not performed well in unmanned programs either as three Atlas-Able lunar probe launches in 1959–60 had all failed. The Air Force was also experiencing problems with military launches as a MIDAS early warning satellite and a SAMOS photoreconnaissance satellite launched with Atlas‑Agenas both failed to orbit during 1960. Only a few days before the flight of MA‑4 in September 1961, an Atlas‑Agena carrying a SAMOS satellite fell back on the launch pad at Vandenberg AFB, producing a spectacular explosion. Atlas ICBM tests at this time were still routinely failing as well.These incidents produced a series of confrontations between NASA and Convair, the builders of the Atlas. The latter argued that many of the failed NASA and Air Force space launches were due to faults of the upper stages or payload rather than the Atlas itself. NASA for their part were left in a difficult situation as the Atlas was the only launch vehicle available that could put the Mercury into orbit, unless they wanted to wait 2–3 years for the Titan II ICBM to become operational.There were a series of delays getting the Atlas and Mercury capsule ready in part due to extensive modifications made to the former. Vehicle 88D did not undergo its factory rollout inspection until June 30 and delivery to the Cape waited until July 15. Moreover, the flight was not going to use Mercury capsule #9 as planned, but instead capsule #8, which had been recovered from the MA‑3 launch and refurbished. Capsule #8 was also the last of the older models with small port windows, no landing bag, and a heavy locking mechanism on the hatch.Further delays happened when it was discovered that the brand of transistor used in both the Atlas and Mercury were prone to forming solder balls, thus the entire last week of August was spent laboriously repairing them.In August, the Soviet Union orbited cosmonaut Gherman Titov in Vostok 2 for a day‑long flight, producing stunned disbelief in the US and paranoia in some quarters as Soviet premier Nikita Khrushchev proclaimed in a speech afterwards "We have launched Gagarin and Titov into space, and we can deliver a nuclear weapon to any point on the planet!"This flight was an orbital test of the Mercury Tracking Network and the first successful orbital flight test of the Mercury program. (All previous successful launches were suborbital) The payload consisted of a pilot simulator (to test the environmental controls), two voice tapes (to check the tracking network), a life support system, three cameras, and instrumentation to monitor levels of noise, vibration and radiation. Because it was suspected that a transient voltage caused the malfunction of MA‑3's programmer (and that a similar problem had been responsible for Big Joe's failure to stage), Convair equipped the autopilot to give the engines a counteracting capability. Thus, testing this was also an objective of the flight. It demonstrated the ability of the Atlas LV-3B rocket to lift the Mercury capsule into orbit, of the capsule and its systems to operate completely autonomously, and succeeded in obtaining pictures of the Earth. It completed one orbit prior to returning to Earth. The capsule was recovered 176 miles east of Bermuda. One hour and 22 minutes after splashdown the destroyer USS Decatur (DD-936) (which was 34 miles from the landing point) picked up the capsule. On the MA‑4 mission, all flight objectives were successfully achieved.".
• Mercury-Atlas_4 thumbnail Atlas_D_with_MA-4_(Sep._13,_1961)_1.jpg?width=300.
• Mercury-Atlas_4 wikiPageID "747033".
• Mercury-Atlas_4 wikiPageRevisionID "588597244".
• Mercury-Atlas_4 apsis "gee".
• Mercury-Atlas_4 harvardDesignation "1961".
• Mercury-Atlas_4 hasPhotoCollection Mercury-Atlas_4.
• Mercury-Atlas_4 imageCaption "The launch of Mercury-Atlas 4".
• Mercury-Atlas_4 insignia "Mercury insignia.png".
• Mercury-Atlas_4 landingDate "--09-13".
• Mercury-Atlas_4 launchDate "--09-13".
• Mercury-Atlas_4 launchRocket Atlas_LV-3B.
• Mercury-Atlas_4 launchSite Cape_Canaveral_Air_Force_Station.
• Mercury-Atlas_4 launchSite Cape_Canaveral_Air_Force_Station_Launch_Complex_14.
• Mercury-Atlas_4 manufacturer McDonnell_Aircraft.
• Mercury-Atlas_4 missionDuration "6560.0".
• Mercury-Atlas_4 missionType "Test flight".
• Mercury-Atlas_4 name "Mercury-Atlas 4".
• Mercury-Atlas_4 nextMission Mercury-Atlas_5.
• Mercury-Atlas_4 operator NASA.
• Mercury-Atlas_4 orbitEpoch "1961-09-13".
• Mercury-Atlas_4 orbitInclination "32.57".
• Mercury-Atlas_4 orbitPeriod "5316.0".
• Mercury-Atlas_4 orbitReference Geocentric_orbit.
• Mercury-Atlas_4 orbitRegime Low_Earth_orbit.
• Mercury-Atlas_4 orbitsCompleted "1".
• Mercury-Atlas_4 previousMission Mercury-Atlas_3.
• Mercury-Atlas_4 programme Project_Mercury.
• Mercury-Atlas_4 programme "(Mercury-Atlas series)".
• Mercury-Atlas_4 satcat "183".
• Mercury-Atlas_4 spacecraft "Mercury No.8".
• Mercury-Atlas_4 subject Category:Project_Mercury.
• Mercury-Atlas_4 subject Category:Spacecraft_launched_in_1961.
• Mercury-Atlas_4 subject Category:Spacecraft_which_reentered_in_1961.
• Mercury-Atlas_4 type ArtificialSatellite.
• Mercury-Atlas_4 type Satellite.
• Mercury-Atlas_4 type Event.
• Mercury-Atlas_4 type SpaceMission.
• Mercury-Atlas_4 type Thing.
• Mercury-Atlas_4 comment "Mercury-Atlas 4 was an unmanned spaceflight of the Mercury program. It was launched on September 13, 1961 at 14:09 UTC from Launch Complex 14 at Cape Canaveral, Florida. A Crewman Simulator instrument package was aboard. The craft orbited the Earth once.At this time, NASA was getting increasingly frustrated with the Atlas's poor launch record. Of four Mercury-Atlas flights so far, two (MA-1 and MA-3) had been total failures.".
• Mercury-Atlas_4 label "Mercury-Atlas 4".
• Mercury-Atlas_4 label "Mercury-Atlas 4".
• Mercury-Atlas_4 label "Mercury-Atlas 4".
• Mercury-Atlas_4 label "Mercury-Atlas 4".
• Mercury-Atlas_4 label "Mercury-Atlas 4".
• Mercury-Atlas_4 label "Меркурий-Атлас-4".
• Mercury-Atlas_4 sameAs Mercury-Atlas_4.
• Mercury-Atlas_4 sameAs Mercury-Atlas_4.
• Mercury-Atlas_4 sameAs Mercury-Atlas_4.
• Mercury-Atlas_4 sameAs Mercury-Atlas_4.
• Mercury-Atlas_4 sameAs Mercury-Atlas_4.
• Mercury-Atlas_4 sameAs m.037y53.
• Mercury-Atlas_4 sameAs Q605618.
• Mercury-Atlas_4 sameAs Q605618.
• Mercury-Atlas_4 wasDerivedFrom Mercury-Atlas_4?oldid=588597244.
• Mercury-Atlas_4 depiction Atlas_D_with_MA-4_(Sep._13,_1961)_1.jpg.
• Mercury-Atlas_4 isPrimaryTopicOf Mercury-Atlas_4.