Project Space Track - Knowledge (XXG)

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NORAD Ballistic Missile Early Warning System (BMEWS) made early radar observations and Mr. Leonard of the Sacramento, California Moonwatch team alerted Space Track when he saw many fragments where only a few satellites were expected from the launch. In the next few days, this gave Project Space Track its first major effort as a backup for the new squadron. Lawrence W. Cuthbert, 1st Lt Algimantas Šimoliūnas, and Ed Casey achieved a landmark in satellite tracking, plotting observations by hand and identifying orbits for 296 of the fragments. Orbital Analysts at 1st Aero were also heavily involved in the achievement. Observations from the SPASUR fence were very helpful in tracking the fragments (SPASUR had initially refused to send Space Track individual observations, sending instead only orbital parameters, but this policy had fortunately been changed by 1961).

533:, instead of coming down over the Pacific ocean. It was recovered by Russian miners, likely very helpful to Russian intelligence and the Russian space program in general). Later, to improve the accuracy of the deorbit commands, orbital analysts Lt Algimantas Šimoliūnas, Lawrence Cuthbert, or Ed Casey would update the Space Track ephemeris for each Discoverer at the last minute and send the update to the 6594th. The 6594th had a global network of tracking stations (including Alaska, Hawaii, Seychelles, Guam, and the UK), used for command and on-orbit control of the satellites. However, the tracking data was derived from telemetry monitoring and was not as precise as the Space Track data, which was based in major part on radar and optical tracking. 595:, a division, of the Ford Motor Company, had a contract with Space Track to develop improved methods of predicting the orbits of decaying satellites, a computer program called Spiral Decay, and for other software for new computers in the new building. (Aeronutronic had been hired to do a system analysis of the control center on 1 October 1959. Detailed reports of this and other Aeronutronic support of Project Space Track are on file at the offices of Lockheed Martin (formerly Loral Corporation) in Colorado Springs, Colorado. An index of the reports is at the National Museum of the Air Force.) 199: 572:. These pads were each made of twin sets of pages, the top one of which had all letters and numbers on a line, perhaps 40 lines to a page. The top sheet was carbonless paper. To use the sheets, one circled each letter or number row-by-row on the top sheet. This marked the second sheet, which had all the letters and numbers scrambled. The scrambled version could then be transmitted by teletypewriter or telephone to the recipient who, using his matching set of one-time pads, could reverse the process and read the secure message. 453:

called Alpha I, when known – in the case of Sputnik I, it wasn't clear initially which was the payload, so the payload became Alpha II. Other pieces were also numbered, so the carrier rocket was usually Alpha II. The 24 Greek letters were soon used, so the next sequence started Alpha Alpha and so forth. By 1962 Beta Psi had been launched and it was clear that the Greek alphabet system would no longer work. Thereafter, launches were numbered, starting with 1963-1 with the payload normally being 1963-1A, etc...

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Peter P. Kamrowski. The center was manned by a Duty Controller and his assistants. The center was designed by Senior Controller 1st Lt Cotter, based on his earlier experience as a volunteer member of the USAF Ground Observer Corps (the Ground Observer Corps filter centers were in turn based on the United Kingdom aircraft tracking centers developed during World War II to track Nazi aircraft).

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elements for all unknown radar tracks; the methodology worked and it became known as the Cuthbert-Morris Algorithm. The resulting program was called "Breakup, Lost and Decay" and, along with subsequent improvements, it has found thousands of the objects in the Space Satellite Catalog. It is still the Air Force Astrodynamic Standard for Uncorrelated Target (UCT) processing.

182:, which were then themselves classified, should be only one word), ADC immediately decided to rename Space Track as SPACETRACK and the name has stuck since – although the web site of the 614th Air & Space Operations Center, which currently performs the mission, has returned to two words. The 614th is part of the 436:

The ephemeris computations were issued in what was called a bulletin. The bulletin listed each equatorial crossing of the satellite and described the path between crossings. Space track also furnished "look angles", altitude and azimuth directions so that specific sensors could point in the correct

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Discoverer XIX (1960 Tau) had a payload called MIDAS, the developmental version of what later became the Defense Support Program. The Air Force decided that the MIDAS orbit should be classified, which meant that Space Track sensor observations had to be classified also. This led to a surreptitious

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The NSSCC had a room dedicated as a filter center for monitoring communications and obtaining observations. The filter center had displays listing the orbiting and decayed satellites and a projector system that could show the motion of one satellite over the earth. The displays were devised by A/3C

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By international agreement under the International Astronomical Union, the satellites and space probes were initially named with Greek letters, following the system for naming stars in constellations. The year of launch was included in the launch names, so Sputnik I was 1957 Alpha. The payload was

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Since December 1958, Space Track had been the interim National Space Surveillance Control Center. In December 1959, Space Track was moved to a new building, the National Space Surveillance Control Center (NSSCC), which was formally dedicated on 9 February 1960. The NSSCC was part of the Air Force

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on 4 October, two German expatriates, Dr. G. R. Miczaika (from Prussia) and Dr. Eberhart W. Wahl (from Berlin) formed Project Space Track (originally called Project Harvest Moon). It was established in Building 1535 of the Geophysics Research Directorate (GRD), Air Force Cambridge Research Center,

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Another method Space Track later had was a secure teletypewriter machine that had a pre-punched paper tape attached. The tape served to garble each letter typed, which could then be decrypted by a reverse procedure at the other end of the teletypewriter line. This system was used to communicate

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The technique used to identify multiple objects orbiting in the same orbital plane was refined by Lawrence Cuthbert and published as an automated program by the Wolf Corporation [Later, Larry worked with Bob Morris, Chief Orbital Analyst at Colorado Springs, to develop a program to derive orbital

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Perhaps causing inadvertent fireworks in celebration of the activation of the 1st Aerospace Surveillance and Control Squadron, the Ablestar stage for the Navy's Transit 4A satellite, 1961 Omicron, which was launched on 29 June 1961, exploded about 77 minutes after attaining orbit, at 0608Z. The

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On rare occasions, the observations were purely verbal. For example, individuals on ships, planes, and islands in the Caribbean reported sightings of the decay of satellite 1957 β, although one aircraft was able to provide a detailed observation because the navigator happened to be completing a

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In general, observations were in the form of time, azimuth and elevation (and range, from radars) as measured at the site or, in some cases, such as at Goldstone, in astronomical form (Right Ascension and Declination) Some early observations were very primitive, such as a report that a satellite

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As soon as a new satellite or space probe was launched, Space Track alerted the primary sensors and processed observations as they came in, issuing a preliminary tracking bulletin promptly and updating it after about 24 hours when additional observations from around the world had been obtained.

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Eleven officers and one Senior Master Sergeant were selected to be the initial cadre of what became the 1st Aerospace Surveillance and Control Squadron. The initial cadre came to Space Track for training that started 7 November 1960. (The cadre was assigned to the new squadron on 6 March 1961.)

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Lockheed decided to put a small light on Discoverer XI (1960 Delta). Space Track acted as liaison between the 6594th and the Smithsonian Astrophysical Observatory, to use their Baker-Nunn camera at Cadiz, Spain, to photograph the light. This would give Lockheed valuable information about the

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Space Track also issued public catalogues listing all the satellites, including ones no longer in orbit, called Satellite Situation Reports, which gave basic orbital elements for each piece. At first, this took less than a page of type. The Smithsonian Astrophysical Observatory also issued a

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Eventually, Roy Norris and Lt Cotter inveigled the IBM 610 into cutting paper tapes for the satellite bulletins, so that the airmen in the communication department would not have to type all the data by hand. This was not part of the IBM 610 design and was a surprise to IBM personnel. Later

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Miczaika, G.R. and Wahl, E.W.. The Orbital Motion of the Earth Satellite 1957 β from 1 April 1958 to Its Decay 14 April 1958. Bedford, MA: 5 June 1958. AFCRC-TN-58-445. The report includes observations made in the United States, England, Finland, Netherlands, Japan, Canada, and Germany,

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Because the Discoverer satellites carried payloads that were deorbited and recovered from parachutes by aircraft of the 6594th Aerospace Test Wing based in Hawaii, the timing of deorbit was critical. (The deorbit attempt of Discoverer 2's payload went seriously wrong: the payload landed on

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By 1960, the position of Duty Analyst was established. Once observations had been reduced, the duty analyst reviewed them and decided which orbits needed to be recomputed to bring them up to date. In the case of new launches or decaying satellites, one analyst was dedicated to processing

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Routine bulletins continued to be issued regularly as needed to keep up with the changing orbits, some of which decayed fairly rapidly in the atmosphere. There was another flurry of activity when the last revolutions occurred, as it was difficult to forecast the exact reentry path.

400:, always announced new Soviet satellite or space probe launches promptly, so Space Track was free to discuss the new objects without worrying about compromising sources. Translations of the Russian announcements were provided by the Foreign Broadcast Information Service (FBIS). 484:

of the California Institute of Technology, which verified that the probe had headed for the moon. Dr. Curtis used a plot of this data in a presentation to a committee of the US House of Representatives. His presentation helped influence President Kennedy to establish the

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prototype radars on Trinidad also participated. Normally, the first radar reports of a new satellite launch from Tyuratam (Baikonur) came from Shemya and the first of a new launch from Kapustin Yar came from Diyarbakır. A USAF radar at the Laredo Test Site in Texas and

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The bulletins and look angles were initially typed by hand by airmen in the communications office and sent by teletypewriter to all the participating sensors. The teletypewriter machines used punched paper tape, before the invention of chadless tape.

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saying that the satellite had passed to the left of the zenith at 2.25 degrees, implying an orbital inclination of 89.9 degrees. This report is probably the only direct observation of the inclination of a satellite's orbit that has ever been made.

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Cotter, L R.: Sputniks and Space, The National Space Surveillance Control Center. Presentation before a joint meeting of the New England Society for Paint Technology and The New England Paint, Varnish, and Lacquer Association. Boston: 19 January

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Drs. Miczaika and Wahl had assembled a list of facilities that could track satellites, either by monitoring telemetry or by using radar. The latter were mostly astronomical radio telescopes equipped with radars used in studying the moon (e.g.,

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Miller, James G.. Special Perturbations Uncorrelated Track Processing. AAS 07-228.(sic). Paper presented at the 2007 AAS/AIAA Astrodyamics Specialist Conference, Mackinac Island, Michigan, 19–23 August 2007. AAS 07-288. Not held at USAF

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direction to acquire the satellite. Special versions of the look angles were tailored for specific sites, such as the Army and Navy sensor development projects. At the NSSCC, these computations were transmitted by the Duty Controller.

505:(1959 Beta). Lockheed Corporation, the development contractor, won their bonus payment because the telemetry showed the satellite achieved orbit, but it was never seen again, despite massive Space Track and other efforts to find it. 306:

One of SPASUR's contributions to satellite tracking was the invention of a map of the earth that showed both poles, so that the position of all satellites, including those in polar orbits, could be shown. This was not possible with

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The Department of Defense had decided that the US Air Force should develop a command and control system for tracking satellites and that the US Army and US Navy should develop sensors for the purpose. US Navy development was at

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Dr. Wahl presented detailed descriptions of Space Track activity at the first two International Symposia on Rockets and Astronautics in Tokyo, 1959 and 1960. Dr. Curtis and Lt Cotter made a similar presentation in 1960.

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Curtis, Harold O. and Cotter, Lawrence R.: "The Operation of the National Space Surveillance Control Center." United States Air Force Ballistic Missile Symposium, 1960. USAF: San Diego CA, 1960?. Not held at USAF

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Another very important group was the employees of Wolf R&D Corporation (Concord, Massachusetts), which did programming and had the contract for operating computers at the NSSCC, including the IBM 7090 mainframe.

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and is now operated by the US Air Force. The Army program, although achieving accurate tracking results with doppler techniques and furnishing observations to Space Track, did not achieve funding for deployment.

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was trying to achieve a successful launch in the Discoverer satellite program. The satellites, launched from Vandenberg AFB, were all in polar orbits. They were controlled by the 6594th at Palo Alto (later the

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The observations were recorded on IBM punched cards for computer processing. All unclassified observations were exchanged daily with the Smithsonian Astrophysical Observatory, Cambridge, Massachusetts.

422:. The IBM 610 was a very primitive machine, the programing of which was done with a plug board (similar to the ones used for IBM accounting machines in the early 1950s) and a punched paper tape. 1039: 411:

The method for computing ephemerides (documented in detail in a 1960 report by P.M. Fitzpatrick and G.B. Findley) was originally developed by Dr. Wahl, based on historic astronomical methods.

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of satellite transmission or, in a few cases, the Doppler shift from their own transmissions reflected from the orbiting object. One doppler site was the Space Track Doppler Field Site at

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In cavalier disregard of the Air Force Regulation on the subject, which specified clearly that unclassified nicknames, such as Space Track, should be two words (while codewords, such as

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midnight data transfer in central Concord, Massachusetts between Dr. Gordon Pettingill of Millstone Hill and Lt Cotter, as there was no secure teletypewriter or telephone available.

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Nauer, David J. ed.. History of On-Orbit Satellite Fragmentations. Sixth edition, pp. 22-23. Teledyne Brown Engineering: Colorado Springs CO July 1992. Not held at USAF Museum.

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Letter, Subject: Recommendation for Award of AF Commendation Medal to A3C Peter P. Kamrowski, AF 17538381. Bedford MA: Headquarters Electronic Systems Division, 19 June 1961

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Space Track was the only organization that used observations from all types of sources: radar, optical, radio, and visual. All unclassified observations were shared with the

433:. Major programming of the new computers was done by the Aeronutronic Division of the Ford Motor Company, Newport Beach CA. The Wolf Corporation also supported the NSSCC. 939:"Air Force Hunts Capsule in Arctic; Reports Hint the Discoverer Instruments Fell Near Spitsbergen Island". New York Times: 17 April 1959, p. 12. Not held at USAF Museum 1044: 69: 408:

Dr. Wahl had been computing all the satellite ephemerides by hand using a Friden Square Root Calculator, the most advanced mechanical calculator then available.

1029: 175:(SPADATS). The first Squadron Commander was Colonel Robert Miller. The Space Track organization at Hanscom Field assumed a backup role for squadron operations. 909:

Kissell, Kenneth E.. Analysis of the Announced Trajectory of the Russian Extra-terrestrial Vehicle, Mechta I. Bedford, MA: September 1959. AFCRC-TN-59-605.

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By 1960, Space Track had about 150 cooperating sensors. Space Track was the only US organization that used all methods of observation to track satellites.

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Wahl, E W. and Delaney, W A. The Orbital Motion of the Earth Satellite 1958-Delta One During the Last Days of its Existence. Bedford, MA: 2 January 1959.

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at Sunnyvale CA). Lt Cotter was the liaison officer between Space Track and the 6594th. The first 12 launch attempts were failures; the first success was

61:. Observations were obtained from some 150 sensors worldwide by 1960 and regular orbital predictions were issued to the sensors and interested parties. 379:

Team also contributed observations. Among these many volunteers was Arthur S. Leonard of Davis, California, leader of the Sacramento, California team.

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In October 1960, George Westrum presented a short college-level course in Celestial Mechanics for those NSSCC personnel who wished to participate

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Wackernagel, H B.. The Satellite 1959 Gamma (Discoverer II). A Preliminary Analysis. pp. 3, 11. Bedford, MA: August 1959. AFCRC-TN-59-457.

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Headquarters USAF. The History of Air Defense Command, Jan - Jun 1964. Showing the official usage as all caps SPACETRACK. Washington DC: 19665?

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Air Force Cambridge Research Center. Background of National Space Surveillance Control Center. Press release 60-P7. Bedford, MA: February 1960?

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similar document but, in 1961, NASA's Goddard Space Flight Center assumed responsibility for both reports, combining them into one document.

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As with many other activities in the dawning space age, Space Track operations often involved doing things for which no precedent existed.

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Two additional cameras were later added to the USAF inventory – one of the USAF cameras was transferred to the Royal Canadian Air Force at

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Command and Control Development Division (known informally as C²D²), Air Research and Development Command. Dr. Harold O. Curtis of

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Cuthbert, Lawrence W.: Ballbuster in Orbit. The Official History of Spacetrack. Project Space Track: Bedford MA: June 1965.

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under the direction of Col Victor A. Cherbak, Jr. By late 1959, the SPO had received additional responsibilities under the DoD

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Cuthbert, Lawrence W.. Space Sweep. Computer program. Wolf R&D Corporation: Concord MA, 1966. Not held at USAF Museum.

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Wahl, E W.. , Proceedings of the First Symposium (International) on Rockets and Astronautics, Chapter 4. Tokyo: 1959.

1013:. Index/History for the Aeronutronic Astrodynamics Collection. Loral Corporation. Colorado Springs CO: September 1993 825:

Fitzpatrick, F.M. And Findley, G.B.: The Tracking Operation at the National Space Surveillance Control Center (NSSCC),

783: 393:, the CIA Foreign Missile and Space Analysis Center (FMSAC), and Headquarters USAF Intelligence, Major Harry Holeman. 265: 198: 156:

Space Track continued tracking satellites and space probes until 1961. In late 1960, USAF Vice Chief of Staff General

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An Electronic Support System Program Office, 496L, had been established in February 1959, with the program office at

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or other projections, which do not show the entire earth. The map was, of course, very distorted at the poles (the

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Cuthbert, Lawrence W.. Determination of Elements for Satellites in Known Orbital Planes. Bedford MA: November 1963

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Wahl, E. W.. Program Development in Orbital Computation at the U.S. National Space Surveillance Control Center. .

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In addition to data communications, Space Track published a series of technical reports. (e.g. see References, ).

353:; Curaҫao, Netherlands West Indies; Villa Dolores, Argentina; and Haleakala, Maui, Hawaii. USAF cameras were at 273: 94: 568:

There was some limited secure communication: One method valid for sending classified information was a pair of

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with Air Force Intelligence at the Pentagon. More sophisticated cryptographic equipment was available later.

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illustrating the widespread international efforts to observe satellites in the early days of the space age.

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Most Space Track communication was by teletypewriter or, in some cases, by telephone, mail, or messenger.

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also participated later. Observations were received from the Royal Canadian Air Force research radar at

255:, had been built to observe Soviet missile launches and became valuable for satellite tracking as well. 1069: 105: 31: 611:"From Satellite Tracking to Space Situational Awareness: The USAF and Space Surveillance: 1957 to 2007" 252: 236: 755:

Cotter, Lawrence R.: Reminiscences About Space Track History. Privately published. : 20 November 2006.

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By this time Space Track had contacts with many sensors around the world. One of them was at the

480:(aka Mechta (Dream)), their first lunar probe. Tracking data was obtained for Space Track by the 369: 334: 295:. The observations obtained by this technique were the time of closest approach to the station. 244: 232: 228: 212: 147: 1074: 319: 299: 240: 203: 537:

accuracy of their orbit computations. The experiment worked very well and was not repeated.

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Typescript list of observations of Discoverer II received at Project Space Track, undated.

362: 326:(SAO), three Baker-Nunn cameras operated by the USAF, and the Boston University camera at 167:

On 1 July 1961, the new squadron became operational under the USAF Air Defense Command at

157: 101: 27: 664: 489:. Kenneth E. Kissell later published a Project Space Track analysis of the trajectory. 486: 346: 187: 109: 1023: 684:, Wright-Patterson AFB, Ohio. For JPEG copies of the references, see the Talk Page. 288: 248: 659: 592: 569: 565:

computers would also prepare the bulletin and look angle data tapes automatically.

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decided that the research and development system was ready to become operational.

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was the entire top line of the long map) but the concept proved very useful.

142:. Continuing development of Space Track was an integral part of this effort. 826: 89: 58: 891:

Westrum, George. Outline of Celestial Mechanics Courses. , 6 October 1960.

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was exceptionally helpful with radio observations of Soviet space probes.

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By 1960, there were about 70 people in the NSSCC involved in operations.

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Air Force Cambridge Research Center. Press release 60-P6. Bedford, MA:

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was the Director of the NSSCC. The name Space Track continued in use.

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Except as noted, all documents referenced are in the archives of the

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In late August 1958, Space Track obtained its first computer, an

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Teletype message, Space Track Control Center, 5 June 1960 1630Z.

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Cuthbert, Lawrence W.. E-mail correspondence. : 30 August 2010

124:, which was launched on 3 November 1957 and contained the dog 654: 418:, used in conjunction with the Cambridge Research Center 179: 764:

Miller, . Signed draft AF Form 77a. : 31 August 1961

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on 2 January 1959, Space Track also started tracking

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of the Earth, including both US and Soviet payloads,

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20th-century history of the United States Air Force

389:Space track maintained close contact with the US 375:Volunteer amateur astronomers as part of the SAO 88:On 29 November 1957, shortly after the launch of 16:Research and development project of US Air Force 644:- includes coverage of Project Space Track era 70:1st Aerospace Surveillance and Control Squadron 45:Project Space Track was started in 1957 at the 1055:Military units and formations in Massachusetts 682:National Museum of the United States Air Force 22:was a research and development project of the 280:passed near a star that could be identified. 8: 1035:Scientific organizations established in 1957 425:The new NSSCC building was equipped with an 396:It was helpful that the USSR press service, 100:The mission of Space Track was to create a 865: 863: 852: 850: 848: 846: 844: 751: 749: 747: 745: 699: 697: 695: 821: 819: 817: 815: 813: 811: 809: 807: 805: 712: 710: 112:, and debris. With the Soviet launch of 735: 733: 731: 476:On 2 January 1959, the Soviets launched 1045:Projects of the United States Air Force 917: 915: 691: 631: 516:. One of their ninety observations of 120:. The first major tracking effort was 324:Smithsonian Astrophysical Observatory 320:Baker-Nunn satellite tracking cameras 215:and the US Army's program was at the 66:Smithsonian Astrophysical Observatory 7: 1030:1957 establishments in Massachusetts 499:Air Force Satellite Control Facility 318:Optical sensors included the twelve 204:Baker-Nunn satellite tracking camera 171:, Colorado Springs, part of NORAD's 104:to track and compute orbits for all 620:. U.S. Air Force Historical Society 609:Sturdevant, Rick W. (Winter 2008). 173:Space Detection and Tracking System 78:Space Detection and Tracking System 345:; Mitaka, Japan; Nani Tal, India; 251:in the Aleutians and the other at 49:at Laurence G. Hanscom Field, now 14: 465:observations for that satellite. 429:and, a few months later, with an 298:The Navy program was operated as 235:in Massachusetts directed by Dr. 137:Advanced Research Projects Agency 284:celestial fix at the exact time 514:International Geophysical Year 472:Unusual Space Track operations 1: 638:: CS1 maint: date and year ( 262:one at Moorestown, New Jersey 184:Joint Space Operations Center 47:Air Force Research Laboratory 330:operated by Walter Manning. 287:Some sites could record the 247:). Two USAF radars, one on 57:shortly after the launch of 520:(1959 Gamma) was sent from 266:Prince Albert, Saskatchewan 243:in California, directed by 241:Stanford Research Institute 1101: 880:Satellite Situation Report 494:6594th Aerospace Test Wing 322:operated for NASA by the 274:Jet Propulsion Laboratory 95:Laurence G. Hanscom Field 391:National Security Agency 293:Billerica, Massachusetts 225:Jodrell Bank Observatory 42:, domestic and foreign. 829:, FL: 2 September 1960. 227:in England directed by 217:Aberdeen Proving Ground 72:until 1976, as part of 1085:Waltham, Massachusetts 1080:Bedford, Massachusetts 512:, associated with the 328:Patrick Air Force Base 207: 133:Waltham, Massachusetts 55:Bedford, Massachusetts 51:Hanscom Air Force Base 784:"Space-Track - Login" 239:, and a radar at the 201: 106:artificial satellites 32:artificial satellites 1060:Lockheed Corporation 492:At this period, the 404:Orbital computations 333:SAO cameras were at 231:, Millstone Hill of 790:on 5 September 2010 20:Project Space Track 882:Volume 18, Issue 1 670:RCAF participation 372:, Canada in 1961. 370:Cold Lake, Alberta 361:, California, and 253:Diyarbakır, Turkey 233:Lincoln Laboratory 229:Sir Bernard Lovell 213:Dahlgren, Virginia 208: 148:Lincoln Laboratory 618:Air Power History 237:Gordon Pettingill 1092: 1014: 1011: 1005: 1001: 995: 992: 986: 983: 977: 974: 968: 964: 958: 955: 949: 946: 940: 937: 931: 928: 922: 919: 910: 907: 901: 898: 892: 889: 883: 876: 870: 867: 858: 854: 839: 836: 830: 823: 800: 799: 797: 795: 786:. Archived from 780: 774: 771: 765: 762: 756: 753: 740: 737: 726: 723: 717: 714: 705: 701: 643: 637: 629: 627: 625: 615: 339:Jupiter, Florida 272:facility of the 1100: 1099: 1095: 1094: 1093: 1091: 1090: 1089: 1020: 1019: 1018: 1017: 1012: 1008: 1002: 998: 993: 989: 984: 980: 975: 971: 965: 961: 956: 952: 947: 943: 938: 934: 929: 925: 920: 913: 908: 904: 899: 895: 890: 886: 877: 873: 868: 861: 855: 842: 837: 833: 824: 803: 793: 791: 782: 781: 777: 772: 768: 763: 759: 754: 743: 738: 729: 724: 720: 715: 708: 702: 693: 678: 651: 630: 623: 621: 613: 608: 605: 603:Further reading 589: 555: 474: 450: 406: 363:Santiago, Chile 268:, Canada. The 196: 158:Curtis E. LeMay 110:booster rockets 102:tracking system 86: 28:tracking system 17: 12: 11: 5: 1098: 1096: 1088: 1087: 1082: 1077: 1072: 1067: 1062: 1057: 1052: 1047: 1042: 1037: 1032: 1022: 1021: 1016: 1015: 1006: 996: 987: 978: 969: 959: 950: 941: 932: 923: 911: 902: 893: 884: 871: 859: 840: 831: 801: 775: 766: 757: 741: 727: 718: 706: 690: 689: 677: 674: 673: 672: 667: 665:Millstone Hill 662: 657: 650: 649:External links 647: 646: 645: 604: 601: 588: 585: 554: 553:Communications 551: 487:Apollo Program 482:Goldstone site 473: 470: 449: 446: 405: 402: 347:Arequipa, Peru 195: 192: 190:, California. 188:Vandenberg AFB 85: 82: 26:, to create a 15: 13: 10: 9: 6: 4: 3: 2: 1097: 1086: 1083: 1081: 1078: 1076: 1073: 1071: 1068: 1066: 1063: 1061: 1058: 1056: 1053: 1051: 1048: 1046: 1043: 1041: 1038: 1036: 1033: 1031: 1028: 1027: 1025: 1010: 1007: 1000: 997: 991: 988: 982: 979: 973: 970: 963: 960: 954: 951: 945: 942: 936: 933: 927: 924: 918: 916: 912: 906: 903: 897: 894: 888: 885: 881: 875: 872: 866: 864: 860: 853: 851: 849: 847: 845: 841: 835: 832: 828: 822: 820: 818: 816: 814: 812: 810: 808: 806: 802: 789: 785: 779: 776: 770: 767: 761: 758: 752: 750: 748: 746: 742: 736: 734: 732: 728: 722: 719: 713: 711: 707: 700: 698: 696: 692: 688: 685: 683: 675: 671: 668: 666: 663: 661: 658: 656: 653: 652: 648: 641: 635: 634:cite magazine 619: 612: 607: 606: 602: 600: 596: 594: 586: 584: 580: 577: 573: 571: 570:one-time pads 566: 562: 558: 552: 550: 546: 542: 538: 534: 532: 526: 523: 519: 515: 511: 506: 504: 500: 495: 490: 488: 483: 479: 471: 469: 466: 462: 458: 454: 447: 445: 442: 438: 434: 432: 428: 423: 421: 417: 412: 409: 403: 401: 399: 394: 392: 387: 383: 380: 378: 373: 371: 367: 364: 360: 356: 352: 348: 344: 340: 337:, Australia; 336: 331: 329: 325: 321: 316: 314: 310: 304: 301: 296: 294: 290: 289:Doppler shift 285: 281: 277: 275: 271: 267: 263: 258: 254: 250: 249:Shemya Island 246: 242: 238: 234: 230: 226: 220: 218: 214: 205: 200: 193: 191: 189: 185: 181: 176: 174: 170: 165: 161: 159: 154: 151: 149: 143: 141: 138: 134: 129: 127: 123: 119: 115: 111: 107: 103: 98: 96: 91: 84:Establishment 83: 81: 79: 75: 71: 67: 62: 60: 56: 52: 48: 43: 41: 37: 33: 29: 25: 21: 1070:Space probes 1009: 999: 990: 981: 972: 962: 953: 944: 935: 926: 905: 896: 887: 878:GSFC (1978) 874: 834: 792:. 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