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Telstar 401
Telstar 401 is a communication satellite owned by AT&T Corporation, which was launched in 1993, to replace Telstar 301. It was rendered inoperable by a magnetic storm in 1997. At the time of its loss it served as the home base for TV networks such as Fox Broadcasting, CBS, PBS, ABC, and UPN. The satellite is now space debris, remaining in geosynchronous orbit A geosynchronous orbit (sometimes abbreviated GSO) is an Earth-centered orbit with an orbital period that matches Earth's rotation on its axis, 23 hours, 56 minutes, and 4 seconds (one sidereal day). The synchronization of rotation and orbital .... References External links Gunter's Space Page - Telstar 401, 402, 402RNasa NSSDC Entry Communications satellites in geostationary orbit Spacecraft launched in 1993 {{communications-satellite-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Communications Satellite
A communications satellite is an artificial satellite that relays and amplifies radio telecommunication signals via a Transponder (satellite communications), transponder; it creates a communication channel between a source transmitter and a Radio receiver, receiver at different locations on Earth. Communications satellites are used for television, telephone, radio, internet, and military applications. Many communications satellites are in geostationary orbit above the equator, so that the satellite appears stationary at the same point in the sky; therefore the satellite dish antennas of ground stations can be aimed permanently at that spot and do not have to move to track the satellite. Others form satellite constellations in low Earth orbit, where antennas on the ground have to follow the position of the satellites and switch between satellites frequently. The radio waves used for telecommunications links travel by Line-of-sight propagation, line of sight and so are obstructe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Telstar 402
Telstar 402 was a communications satellite owned by AT&T Corporation. Telstar 402 was successfully launched into space on September 9, 1994, by means of an Ariane-42L vehicle from the Kourou Space Center, French Guiana French Guiana, or Guyane in French, is an Overseas departments and regions of France, overseas department and region of France located on the northern coast of South America in the Guianas and the West Indies. Bordered by Suriname to the west .... It had a launch mass of 3,775 kg. The satellite was lost shortly after launch due to an explosion that occurred in the propulsion system that was caused by leakage of hot gases. References External links Gunter's Space Page - Telstar 401, 402, 402RNasa NSSDC Entry Communications satellites in geostationary orbit Spacecraft launched in 1994 Satellite launch failures {{US-spacecraft-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geosynchronous Orbit
A geosynchronous orbit (sometimes abbreviated GSO) is an Earth-centered orbit with an orbital period that matches Earth's rotation on its axis, 23 hours, 56 minutes, and 4 seconds (one sidereal day). The synchronization of rotation and orbital period means that, for an observer on Earth's surface, an object in geosynchronous orbit returns to exactly the same position in the sky after a period of one sidereal day. Over the course of a day, the object's position in the sky may remain still or trace out a path, typically in a figure-8 form, whose precise characteristics depend on the orbit's inclination and eccentricity. A circular geosynchronous orbit has a constant altitude of . A special case of geosynchronous orbit is the geostationary orbit (often abbreviated ''GEO''), which is a circular geosynchronous orbit in Earth's equatorial plane with both inclination and eccentricity equal to 0. A satellite in a geostationary orbit remains in the same position in the sky to observers ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Space Debris
Space debris (also known as space junk, space pollution, space waste, space trash, space garbage, or cosmic debris) are defunct human-made objects in spaceprincipally in Earth orbitwhich no longer serve a useful function. These include derelict spacecraft (nonfunctional spacecraft and abandoned launch vehicle stages), mission-related debris, and particularly numerous in-Earth orbit, fragmentation debris from the breakup of derelict rocket bodies and spacecraft. In addition to derelict human-made objects left in orbit, space debris includes fragments from disintegration, erosion, or collisions; solidified liquids expelled from spacecraft; unburned particles from solid rocket motors; and even paint flecks. Space debris represents a risk to spacecraft. Space debris is typically a negative externality. It creates an external cost on others from the initial action to launch or use a spacecraft in near-Earth orbit, a cost that is typically not taken into account nor fully accoun ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Broadcasting Company
The American Broadcasting Company (ABC) is an American Commercial broadcasting, commercial broadcast Television broadcaster, television and radio Radio network, network that serves as the flagship property of the Disney Entertainment division of the Walt Disney Company. ABC is headquartered on Riverside Drive in Burbank, California, directly across the street from Walt Disney Studios (Burbank), Walt Disney Studios and adjacent to the Team Disney – Roy E. Disney Animation Building. The network maintains secondary offices at 77 66th Street (Manhattan), West 66th Street on the Upper West Side of Manhattan, New York City, which houses its broadcast center and the headquarters of its news division, ABC News (United States), ABC News. Since 2007, when ABC Radio (also known as Cumulus Media Networks) was sold to Citadel Broadcasting, ABC has reduced its broadcasting operations almost exclusively to television. The youngest of the "Big Three (American television), Big Three" American ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Public Broadcasting Service
The Public Broadcasting Service (PBS) is an American public broadcaster and non-commercial, free-to-air television network based in Arlington, Virginia Arlington County, or simply Arlington, is a County (United States), county in the U.S. state of Virginia. The county is located in Northern Virginia on the southwestern bank of the Potomac River directly across from Washington, D.C., the nati .... PBS is a publicly funded nonprofit organization and the most prominent provider of educational television, educational programs to public television stations in the United States, distributing shows such as ''Nature (TV program), Nature'', ''Nova (American TV program), Nova'', ''Frontline (American TV program), Frontline'', ''PBS News Hour'', ''Masterpiece (TV series), Masterpiece'', ''Mister Rogers' Neighborhood'', ''Sesame Street'', ''Barney & Friends'', ''Arthur (TV series), ''Arthur'''' and ''American Experience''. Certain stations also provide spillover service to Canada. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fox Broadcasting
Fox Broadcasting Company, LLC (commonly known as Fox; stylized in all caps) is an Television in the United States, American commercial broadcasting, commercial broadcast television broadcaster, television network serving as the flagship property of Fox Corporation and operated through Fox Entertainment. Fox is based at Fox Corporation's corporate headquarters at 1211 Avenue of the Americas in Midtown Manhattan, New York City, and it hosts additional offices at the Fox Network Center in Los Angeles and at the Fox Media Center in Tempe, Arizona. The channel was launched by News Corporation on October 9, 1986 as a competitor to the Big Three (American television), Big Three television networks, which are the American Broadcasting Company (ABC), the CBS, Columbia Broadcasting System (CBS), and the NBC, National Broadcasting Company (NBC). Fox went on to become the most successful attempt at a fourth television network; it was also the highest-Nielsen ratings, rated free-to-air netwo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geomagnetic Storm
A geomagnetic storm, also known as a magnetic storm, is a temporary disturbance of the Earth's magnetosphere that is driven by interactions between the magnetosphere and large-scale transient Plasma (physics), plasma and magnetic field structures that originate on or near the Sun. The structures that produce geomagnetic storms include interplanetary coronal mass ejections (CME) and corotating interaction regions (CIR). The former often originate from solar active regions, while the latter originate at the boundary between high- and low-speed streams of solar wind. The frequency of geomagnetic storms increases and decreases with the sunspot cycle. During solar maximum, solar maxima, geomagnetic storms occur more often, with the majority driven by CMEs. When these structures reach Earth, the increase in the solar wind pressure initially compresses the magnetosphere. The solar wind's magnetic field interacts with the Earth's magnetic field and transfers an increased energy into th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Telstar 301
Telstar 301 is an American communications satellite launched in July 1983 and operated by AT&T. It was one of three Telstar 3 satellites, followed by Telstar 302 in 1984 and Telstar 303 in 1985. The satellite served as the east coast home satellite for the ABC network from 1984 to 1993. The CBS network also used the satellite from 1985 to 1993. It also served as the first home of Fox Broadcasting Company until the late 1980s. Other entities that also used the satellite included Group W, Wold/Keystone Communications (which used the satellite to feed Paramount Television's syndicated output including ''Entertainment Tonight'', '' Star Trek: The Next Generation'', and '' Star Trek: Deep Space Nine''), Compact Video, Lorimar-Telepictures, and Warner Bros. Television Warner Bros. Television Studios, operating under the name Warner Bros. Television (abbreviated as WBTV; formerly known as Warner Bros. Television Division), is an American television production and distribution ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Satellite
A satellite or an artificial satellite is an object, typically a spacecraft, placed into orbit around a celestial body. They have a variety of uses, including communication relay, weather forecasting, navigation ( GPS), broadcasting, scientific research, and Earth observation. Additional military uses are reconnaissance, early warning, signals intelligence and, potentially, weapon delivery. Other satellites include the final rocket stages that place satellites in orbit and formerly useful satellites that later become defunct. Except for passive satellites, most satellites have an electricity generation system for equipment on board, such as solar panels or radioisotope thermoelectric generators (RTGs). Most satellites also have a method of communication to ground stations, called transponders. Many satellites use a standardized bus to save cost and work, the most popular of which are small CubeSats. Similar satellites can work together as groups, forming constellatio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Telstar 303
Telstar 303 is a U.S. communications satellite launched from during STS-51-G on 17 June 1985. Owned by AT&T and operated by Loral Skynet Hughes Communications, it was one of three Telstar 3 satellites, preceded by Telstar 301 in 1983 and Telstar 302 in 1984. Description The satellite served as the U.S. west coast and mid-west home satellite (C-band) with 48 transponders for the ABC network from 1984 to 1993. The CBS network used the satellite from 1985 to 1993. It also served as telephone call transfer for remote areas until 1993. Other entities that used the satellite included Group W, Wold/Keystone Communications (which used the satellite to feed Paramount Television's syndicated output including Entertainment Tonight, Star Trek: The Next Generation, and Star Trek: Deep Space Nine), Compact Video, Lorimar-Telepictures, and Warner Bros. Television. In 1987, Melvin Rosen and Stuart Levin acquired 17 transponders on Telstar 303 satellite for the purpose of creating the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
AT&T Corporation
AT&T Corporation, an abbreviation for its former name, the American Telephone and Telegraph Company, was an American telecommunications company that provided voice, video, data, and Internet telecommunications and professional services to businesses, consumers, and government agencies. During the Bell System's long history, AT&T was at times the world's largest telecommunications company, the world's largest cable television operator, and a regulated monopoly. At its peak in the 1950s and 1960s, it employed one million people and its revenue ranged between US$3 billion in 1950 ($ in present-day terms) and $12 billion in 1966 ($ in present-day terms). In 2005, AT&T was acquired by " Baby Bell" and former subsidiary SBC Communications for more than $16 billion ($ in present-day terms). SBC then changed its name to AT&T Inc., with AT&T Corporation continuing to exist as a long-distance calling subsidiary until its dissolution on May 1, 2024. History Origins ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
