Matches in DBpedia 2016-04 for { <http://wikidata.dbpedia.org/resource/Q2672736> ?p ?o }
Showing triples 1 to 58 of
58
with 100 triples per page.
- Q2672736 subject Q15216449.
- Q2672736 subject Q8398197.
- Q2672736 subject Q8705259.
- Q2672736 abstract "The Iridium satellite constellation is a satellite constellation providing voice and data coverage to satellite phones, pagers and integrated transceivers over the Earth's entire surface. Iridium Communications owns and operates the constellation and sells equipment and access to its services. It was originally conceived by Bary Bertiger, Dr. Ray Leopold and Ken Peterson in late 1987 (and protected by patents by Motorola in their names in 1988) and then developed by Motorola on a fixed-price contract from July 29, 1993 to November 1, 1998 when the system became operational and commercially available.The constellation consists of 66 active satellites in orbit, and additional spare satellites to serve in case of failure. Satellites are in low Earth orbit at a height of approximately 485 mi (781 km) and inclination of 86.4°. Orbital velocity of the satellites is approximately 17,000 mph (27,000 km/h). Satellites communicate with neighboring satellites via Ka band inter-satellite links. Each satellite can have four inter-satellite links: two to neighbors fore and aft in the same orbital plane, and two to satellites in neighboring planes to either side. The satellites orbit from pole to pole with an orbit of roughly 100 minutes. This design means that there is excellent satellite visibility and service coverage even at the North and South poles. The over-the-pole orbital design produces "seams" where satellites in counter-rotating planes next to one another are traveling in opposite directions. Cross-seam inter-satellite link hand-offs would have to happen very rapidly and cope with large Doppler shifts; therefore, Iridium supports inter-satellite links only between satellites orbiting in the same direction. The constellation of 66 active satellites has 6 orbital planes spaced 30 degrees apart, with 11 satellites in each plane (not counting spares). The original concept was to have 77 satellites, which is where the name Iridium came from, being the element with the atomic number 77 and the satellites evoking the Bohr model image of electrons orbiting around the Earth as its nucleus. This reduced set of 6 planes is sufficient to cover the entire Earth's surface at every moment.Because of the shape of the Iridium satellites' reflective antennas, the satellites focus sunlight on a small area of the Earth's surface in an incidental manner. This results in an effect called Iridium flares, where the satellite momentarily appears as one of the brightest objects in the night sky and can even be seen during daylight.".
- Q2672736 thumbnail Iridium_Satellite.jpg?width=300.
- Q2672736 wikiPageExternalLink iridium.htm.
- Q2672736 wikiPageExternalLink www.iridium.com.
- Q2672736 wikiPageExternalLink ?c=15&srt=2&dir=0.
- Q2672736 wikiPageExternalLink phones.
- Q2672736 wikiPageWikiLink Q1088832.
- Q2672736 wikiPageWikiLink Q1146104.
- Q2672736 wikiPageWikiLink Q1197016.
- Q2672736 wikiPageWikiLink Q1202533.
- Q2672736 wikiPageWikiLink Q1277959.
- Q2672736 wikiPageWikiLink Q128356.
- Q2672736 wikiPageWikiLink Q15216449.
- Q2672736 wikiPageWikiLink Q154387.
- Q2672736 wikiPageWikiLink Q159.
- Q2672736 wikiPageWikiLink Q172948.
- Q2672736 wikiPageWikiLink Q193701.
- Q2672736 wikiPageWikiLink Q201815.
- Q2672736 wikiPageWikiLink Q209860.
- Q2672736 wikiPageWikiLink Q21501397.
- Q2672736 wikiPageWikiLink Q248903.
- Q2672736 wikiPageWikiLink Q249091.
- Q2672736 wikiPageWikiLink Q249231.
- Q2672736 wikiPageWikiLink Q2510103.
- Q2672736 wikiPageWikiLink Q2661654.
- Q2672736 wikiPageWikiLink Q270897.
- Q2672736 wikiPageWikiLink Q2725562.
- Q2672736 wikiPageWikiLink Q2777589.
- Q2672736 wikiPageWikiLink Q312.
- Q2672736 wikiPageWikiLink Q312021.
- Q2672736 wikiPageWikiLink Q333760.
- Q2672736 wikiPageWikiLink Q40855.
- Q2672736 wikiPageWikiLink Q4112212.
- Q2672736 wikiPageWikiLink Q49538.
- Q2672736 wikiPageWikiLink Q49674.
- Q2672736 wikiPageWikiLink Q531716.
- Q2672736 wikiPageWikiLink Q53665.
- Q2672736 wikiPageWikiLink Q5456329.
- Q2672736 wikiPageWikiLink Q658635.
- Q2672736 wikiPageWikiLink Q663611.
- Q2672736 wikiPageWikiLink Q7240.
- Q2672736 wikiPageWikiLink Q75687.
- Q2672736 wikiPageWikiLink Q76436.
- Q2672736 wikiPageWikiLink Q798444.
- Q2672736 wikiPageWikiLink Q800358.
- Q2672736 wikiPageWikiLink Q827927.
- Q2672736 wikiPageWikiLink Q8398197.
- Q2672736 wikiPageWikiLink Q843912.
- Q2672736 wikiPageWikiLink Q863675.
- Q2672736 wikiPageWikiLink Q8705259.
- Q2672736 wikiPageWikiLink Q877.
- Q2672736 wikiPageWikiLink Q967145.
- Q2672736 comment "The Iridium satellite constellation is a satellite constellation providing voice and data coverage to satellite phones, pagers and integrated transceivers over the Earth's entire surface. Iridium Communications owns and operates the constellation and sells equipment and access to its services. It was originally conceived by Bary Bertiger, Dr.".
- Q2672736 label "Iridium satellite constellation".
- Q2672736 depiction Iridium_Satellite.jpg.