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Intelsat 27
Intelsat 27 was an American communications satellite which was to have been operated by Intelsat. Intended as a replacement for Intelsat 805, it was destroyed after the rocket carrying it to orbit fell into the Pacific Ocean 56 seconds after launch. Design Based on the Boeing 702MP satellite bus, Intelsat 27 was designed to provide fifteen or more years of service to Intelsat customers in North America, South America, the Atlantic Ocean region and Europe. The spacecraft had a mass of , and was equipped with 20 C band and 20 transponders for commercial users, as well as 20 UHF transponders for military use. Originally intended for the United States Navy, the UHF payload was to have been leased to the government of Italy following the US Department of Defense withdrawing. The satellite would have been positioned at 55.5° West in geostationary orbit, co-located with Intelsat 805 and Galaxy 11. Launch Sea Launch were contracted to launch Intelsat 27, using a Zenit-3SL carrier ... [...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; it creates a communication channel between a source transmitter and a 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 high frequency radio waves used for telecommunications links travel by line of sight and so are obstructed by the curve of the Earth. The purpose of communications sate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Satellite Bus
A satellite bus (or spacecraft bus) is the main body and structural component of a satellite or spacecraft, in which the payload and all scientific instruments are held. Bus-derived satellites are opposed to specially produced satellites. Bus-derived satellites are usually customized to customer requirements, for example with specialized sensors or transponders, in order to achieve a specific mission. They are commonly used for geosynchronous satellites, particularly communications satellites, but are also used in spacecraft which occupy lower orbits, occasionally including low Earth orbit missions. Examples Some satellite bus examples include: * Boeing DS&S 702 * Lockheed Martin Space Systems A2100 * Alphabus * INVAP ARSAT-3K * Airbus D&S Eurostar * ISRO's I-1K, I-2K, I-3K, I-4K, I-6K, and Indian Mini Satellite bus * NASA Ames MCSB * SSL 1300 * Orbital ATK GEOStar * Mitsubishi Electric DS2000 * Spacecraft bus of the James Webb Space Telescope * SPUTNIX TabletSat * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spacecraft Launched In 2013
A spacecraft is a vehicle or machine designed to fly in outer space. A type of artificial satellite, spacecraft are used for a variety of purposes, including communications, Earth observation, meteorology, navigation, space colonization, planetary exploration, and transportation of humans and cargo. All spacecraft except single-stage-to-orbit vehicles cannot get into space on their own, and require a launch vehicle (carrier rocket). On a sub-orbital spaceflight, a space vehicle enters space and then returns to the surface without having gained sufficient energy or velocity to make a full Earth orbit. For orbital spaceflights, spacecraft enter closed orbits around the Earth or around other celestial bodies. Spacecraft used for human spaceflight carry people on board as crew or passengers from start or on orbit (space stations) only, whereas those used for robotic space missions operate either autonomously or telerobotically. Robotic spacecraft used to support scientific re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Satellites Using The BSS-702 Bus
A satellite or artificial satellite is an object intentionally placed into orbit in outer space. 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 is small CubeSats. Similar satellites can work together as a group, forming constellations. Because of the high launch cost to space, satellites are designed to be as lightweight and robust as possible. Most communication satellites are radio relay stations in orbit and carry dozens of transponders, each with a bandwidth of tens of megahertz. Satellites are placed from the surface to orbit by launch vehicles, high enough to avoid orbital decay by the atmosphere. Satellites can then change or maintain the orbit by propulsion, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Intelsat 708
Intelsat 708 was a telecommunications satellite built by the American company Space Systems/Loral for Intelsat. It was destroyed on February 15, 1996 when the Long March 3B launch vehicle failed while being launched from the Xichang Satellite Launch Center in China. The launch vehicle veered off course immediately after liftoff and struck a nearby village, officially killing at least six people. The accident investigation identified a failure in the guidance system of the Long March 3B. After the Intelsat 708 accident, the Long March rockets greatly increased in reliability and did not experience another mission failure until 2011. However, the participation of American companies in the Intelsat 708 and Apstar 2 investigations caused great political controversy in the United States. A U.S. government investigation found that the information in the report had been illegally transferred to China. Satellite technology was subsequently reclassified as a munition and placed under ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2013 In Spaceflight
In 2013, the maiden spaceflight of the Orbital Sciences' Antares launch vehicle, designated ''A-ONE'', took place on 13 April. Orbital Science also launched its first spacecraft, Cygnus, that docked with the International Space Station in late September 2013. A total of 81 orbital launches were attempted in 2013, of which 77 were successful, one was partially successful and three were failures. The year also saw eleven EVAs by ISS astronauts. The majority of the year's orbital launches were conducted by Russia, the United States and China, with 31, 19 and 15 launches respectively. Overview India's Indian Space Research Organisation launched its first mission to Mars with the Mars Orbiter Mission that successfully reached Mars orbit on 23 September 2014. Numerous significant milestones in robotic spaceflight occurred in 2013, including the landing of China's Chang'e 3 lander at Moon's Mare Imbrium on 14 December; it is China's first attempt and first successful soft landing ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Galaxy 11
Galaxy 11 is an American geostationary communications satellite which is operated by Intelsat. It is located in geostationary orbit at a longitude of 32.8 degrees east, where it serves as a backup to the Intelsat 802 spacecraft. It was originally operated at 99° West and later spent most of its operational life at 91° West, from where it was used to provide communications services to Brazil and North America. Galaxy 11 was built for PanAmSat by Hughes Space and Communications, and is based on the HS-702 satellite bus. It was the first HS-702 to be launched, and the first satellite to be equipped with an XIPS propulsion system. It carries 24 G/H band and 40 J band (IEEE C and s respectively) transponders, and at launch it had a mass of , with an expected operational lifespan of around 15 years. As the first HS-702 to fly, Galaxy 11 was one of the six which were launched before a design flaw in the type's solar arrays was discovered. Solar concentrators, used to increase the amoun ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geostationary Orbit
A geostationary orbit, also referred to as a geosynchronous equatorial orbit''Geostationary orbit'' and ''Geosynchronous (equatorial) orbit'' are used somewhat interchangeably in sources. (GEO), is a circular geosynchronous orbit in altitude above Earth's equator ( in radius from Earth's center) and following the direction of Earth's rotation. An object in such an orbit has an orbital period equal to Earth's rotational period, one sidereal day, and so to ground observers it appears motionless, in a fixed position in the sky. The concept of a geostationary orbit was popularised by the science fiction writer Arthur C. Clarke in the 1940s as a way to revolutionise telecommunications, and the first satellite to be placed in this kind of orbit was launched in 1963. Communications satellites are often placed in a geostationary orbit so that Earth-based satellite antennas do not have to rotate to track them but can be pointed permanently at the position in the sky where the sat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Government Of Italy
The government of Italy is in the form of a democratic republic, and was established by a constitution in 1948. It consists of legislative, executive, and judicial subdivisions, as well as a Head of State, or President. The Italian Constitution is the result of the work of the Constituent Assembly, which was formed by the representatives of all the anti-fascist forces that contributed to the defeat of Nazi and Fascist forces during the Italian Civil War. Article 1 of the Italian constitution states: ''Italy is a democratic Republic founded on labour. Sovereignty belongs to the people and is exercised by the people in the forms and within the limits of the Constitution''. By stating that Italy is a democratic republic, the article solemnly declares the results of the constitutional referendum which took place on 2 June 1946. The State is not a hereditary property of the ruling monarch, but it is instead a '' Res Publica'', belonging to everyone. The people who are called to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Navy
The United States Navy (USN) is the maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States. It is the largest and most powerful navy in the world, with the estimated tonnage of its active battle fleet alone exceeding the next 13 navies combined, including 11 allies or partner nations of the United States as of 2015. It has the highest combined battle fleet tonnage (4,635,628 tonnes as of 2019) and the world's largest aircraft carrier fleet, with eleven in service, two new carriers under construction, and five other carriers planned. With 336,978 personnel on active duty and 101,583 in the Ready Reserve, the United States Navy is the third largest of the United States military service branches in terms of personnel. It has 290 deployable combat vessels and more than 2,623 operational aircraft . The United States Navy traces its origins to the Continental Navy, which was established during the American Revo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
C Band (IEEE)
The C band is a designation by the Institute of Electrical and Electronics Engineers (IEEE) for a portion of the electromagnetic spectrum in the microwave range of frequencies ranging from 4.0 to 8.0 gigahertz (GHz). However, the U.S. Federal Communications Commission C band proceeding and auction, designated 3.7–4.2 GHz as C band. The C band is used for many satellite communications transmissions, some Wi-Fi devices, some cordless telephones, as well as some Radar and weather radar systems. Use in satellite communication The communications C band was the first frequency band that was allocated for commercial telecommunications via satellites. The same frequencies were already in use for terrestrial microwave radio relay chains. Nearly all C-band communication satellites use the band of frequencies from 3.7 to 4.2 GHz for their downlinks, and the band of frequencies from 5.925 to 6.425 GHz for their uplinks. Note that by using the band from ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
