Its total weight was 30.66

the front end of the satellite and the empty scaled-down Sergeant fourth-stage


proceed with Project Vanguard. Transmissions from Explorer 1 were sent back to Earth for about four months, but the satellite continued to orbit until March 31, 1970, when it burned up after entering the Earth's atmosphere. The bullet-shaped satellite payload, about 6.5 inches in diameter and 3 feet long, carried three micrometeorite detectors (a microphone, a wire grid, and metallic film), temperature sensors, and a special cosmic-ray chamber developed by Van Allen's graduate students at Iowa State University to determine the intensity of high-energy charged particles surrounding the Earth. The object in question is what we always thought was our "fully instrumented flight spare of Explorer 1."

The Explorer 1 team, which included James Van Allen, equipped the satellite with instruments to measure micrometeorite impacts, the internal and external temperature of the satellite, and above all, the concentration of ions and electrons in space. But when he found fewer rays than he expected, he guessed that the satellite's readings must have been thrown off by areas of high radiation in space, coming from highly charged particles caught in the Earth's magnetic field. The satellite, which was designed, built and operated by the NASA Jet Propulsion Laboratory, carried a cosmic ray detector, which lead to … 26 July 1958: Orbited Explorer-IV satellite weighing 37.16 pounds with 25.76 Only after the successful launch of Explorer 3 on March 26 and its insertion into a highly elliptical orbit, and after several weeks of data collection, did Van Allen’s team figure out why the Geiger counter was silent only at certain altitudes above 600 miles: counter saturation. eleven scaled-down Sergeant rocket engines; the third stage is a cluster

Discover all you ever wanted to know about the magnetosphere, including information on the Van Allen radiation belts, at this amazingly detailed site, which also includes a Spanish translation. compartment is also smaller and lighter than the Redstone's.
instrument section. At left is Dr. William H. Pickering, former director of JPL, which built and operated the satellite. Geophysical Year.

Ludwig and his co-trackers were thankful for the encouraging words.

The second lb-sec/lb; propellant, same as for Stage 2. 1954. Ludwig graduated from Iowa State University in 1960 after working on Explorers 1-7. (solid propellant). Explorer 1 was launched by a Jupiter-C missile on January 31, 1958, from the Army Ballistic Missile Agency's (ABMA) Cape Canaveral Missile Annex in Florida.

16,500 lb; burning time, 6.5 seconds; specific impulse, 220 launched by the Army Ballistic Missile Agency (ABMA) under the direction of Dr. Wernher Von Braun. Explorer 1 was the first U.S. satellite and the first satellite to carry scientific instruments. Three principal players stayed in close touch and remained ready to act: geophysicist James Van Allen of the University of Iowa, who would provide the primary scientific instrument for the payload; JPL director William H. Pickering, who would provide the satellite itself; and Wernher von Braun of the ABMA, who would provide the launch system.

Dr. Van Allen theorized that the

Add his or her name to the Museum’s Wall of Honor. Inspection and conservation evaluation of the Explorer 1 satellite by Matthew Nazarro, specialist at the National Air and Space Museum’s Paul E. Garber Facility. Explorer 1's launch was a large policy coup, to be sure, but what was also interesting was the science the little satellite beamed back. Transmitting antennas consisted of two fibre-glass slot antennas in the body

lengthened by eight feet to provide additional propellant. modification of the Redstone ballistic missile--that was designed, built, and Define explorer.

He then set out to find the ones that were missing and to verify that the ones he had collected and carried with him for some 40 years were properly inventoried.

Explorer 1 was equipped with a modified Geiger counter to measure the charged particles surrounding Earth, and its radio transmitters relayed the data to receiving stations.

The external skin of the instrument section was painted in alternate strips (1965). the tub at a rate varying from 450 to 750 rpm to compensate for thrust The project was canceled in 1955, however when the decision was made to programmed so that it was travelling at an angle of 40 degrees from the An implement or a tool used for exploring; a probe. He kept diaries and equipment journals, and many, many tools and instrument parts. Explorer 1 is the United States' first satellite to be sucessfully launched into orbit. When he got word that it would fly in the Explorer configuration, Ludwig packed up his family and payload components and set off for JPL to make the needed alterations. Army Ordnance had lost out to the Navy in 1955 to launch the United States' first satellite, but as ABMA continued to develop reentry vehicles for ballistic missiles, it also kept its hopes of getting into orbit alive. and a range of 3,300 miles from Cape Canaveral, Florida. But was this indeed the very detector in the flight spare?

84 days. You have successfully signed up for our newsletter. The United States Navy had failed to launch the Vanguard satellite just two months prior in early December, and the Soviet Union by now had launched two Sputniks (the second one with a dog, Laika). Explorer definition, a person or thing that explores. 23 October 1958: Attempted orbit of 12-foot inflatable Beacon satellite (31.5

Explorer-I was placed in an orbit with a perigee of 224 miles and an apogee Recognize your favorite air or space enthusiast. Co-author: Dr. Mauricio Peredo re-entry nose cone of the Jupiter IRBM, although its satellite-launching So, only a small fraction of Explorer 1 data could be received when the satellite was in sight of a ground station, and there was not yet continuous coverage around the globe.

imbalance when the clustered motors fire.

Explorer 1 was launched by a Jupiter-C missile on January 31, 1958, from the Army Ballistic Missile Agency's (ABMA) Cape Canaveral Missile Annex in Florida. The tool's fundamental purpose is …

JPL completed the job of modifying the Jupiter-C and building the Explorer-I in The third and fourth stages were fired in turn to In the early 2000s, while preparing to write his memoirs and take stock of his life, he looked for all the surviving cosmic-ray counters his records identified had existed in Van Allen's Iowa laboratory during the early Explorer era.

Chantilly, VA 20151 Apollo 11 was a global event. Was it indeed fully instrumented? General admission is free!Timed-entry reservation required, ‌Follow us on Instagram ‌Like us on Facebook ‌Watch us on YouTube ‌Follow us on Twitter. Right-click Start and select Explorer or Open Windows Explorer. One that explores, especially one that explores a geographic area. That group had been previously credited with the first observation of auroral electrons from a rocket; incidentally, the idea of the IGY itself started in 1950 at a dinner party at Van Allen's home (at the time, near Washington). fourth stage is atop the tub itself. Was it in orbit? 10:00 a.m. - 5:00 p.m.

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