Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/Tundra_orbit> ?p ?o }
Showing triples 1 to 56 of
56
with 100 triples per page.
- Tundra_orbit abstract "A Tundra orbit (Russian: Тундра) is a highly elliptical geosynchronous orbit with a high inclination (usually near 63.4°) and an orbital period of one sidereal day (about 4 minutes less than a solar day). A satellite placed in this orbit spends most of its time over a chosen area of the Earth—a phenomenon known as apogee dwell. The ground track of a satellite in a tundra orbit is a closed figure eight.These orbits are conceptually similar to Molniya orbits, which have the same inclination but half the period (about 12 hours). The only current known users of Tundra orbits are Sirius Satellite Radio and the EKS satellite. The EKS satellite is part of a Russian early warning constellation for missile launches, while Sirius operates a constellation of three satellites used for satellite radio. The RAAN and mean anomaly of each satellite is offset by 120 degrees so that when one satellite moves out of position, another has passed perigee and is ready to take over.Tundra and Molniya orbits are used to provide high latitude users with higher elevation angles than a geostationary orbit. Neither the Tundra nor Molniya orbits are geostationary because that is possible only over the equator, so both orbits are elliptical to reduce the time that the satellite is away from its service area. An argument of perigee of 270 degrees places apogee at the northernmost point of the orbit. An argument of perigee of 90° would likewise serve the high southern latitudes. An argument of perigee of 0° or 180° would cause the satellite to dwell over the equator, but there would be little point to this as this could be better done with a conventional geostationary orbit.The Tundra and Molniya orbits use a sin−1 √4/5 ≈ 63.4° inclination to null the secular perturbation of the argument of perigee caused by the Earth's equatorial bulge. With any inclination other than 63.4 degrees or its supplement, 116.6 degrees, the argument of perigee would change steadily over time so that apogee would occur either before or after the highest latitude is reached.".
- Tundra_orbit thumbnail Qzss-45-0.09.jpg?width=300.
- Tundra_orbit wikiPageID "4662630".
- Tundra_orbit wikiPageLength "2848".
- Tundra_orbit wikiPageOutDegree "25".
- Tundra_orbit wikiPageRevisionID "695638295".
- Tundra_orbit wikiPageWikiLink Apsis.
- Tundra_orbit wikiPageWikiLink Argument_of_periapsis.
- Tundra_orbit wikiPageWikiLink Category:Earth_orbits.
- Tundra_orbit wikiPageWikiLink EKS_(satellite_system).
- Tundra_orbit wikiPageWikiLink Earth.
- Tundra_orbit wikiPageWikiLink Elevation.
- Tundra_orbit wikiPageWikiLink Geostationary_orbit.
- Tundra_orbit wikiPageWikiLink Geosynchronous_orbit.
- Tundra_orbit wikiPageWikiLink Ground_track.
- Tundra_orbit wikiPageWikiLink Highly_elliptical_orbit.
- Tundra_orbit wikiPageWikiLink Latitude.
- Tundra_orbit wikiPageWikiLink Longitude_of_the_ascending_node.
- Tundra_orbit wikiPageWikiLink Mean_anomaly.
- Tundra_orbit wikiPageWikiLink Molniya_orbit.
- Tundra_orbit wikiPageWikiLink Orbital_inclination.
- Tundra_orbit wikiPageWikiLink Orbital_period.
- Tundra_orbit wikiPageWikiLink Orbital_perturbation_analysis_(spacecraft).
- Tundra_orbit wikiPageWikiLink Russian_language.
- Tundra_orbit wikiPageWikiLink Satellite.
- Tundra_orbit wikiPageWikiLink Satellite_constellation.
- Tundra_orbit wikiPageWikiLink Satellite_radio.
- Tundra_orbit wikiPageWikiLink Sidereal_time.
- Tundra_orbit wikiPageWikiLink Sirius_Satellite_Radio.
- Tundra_orbit wikiPageWikiLink Solar_time.
- Tundra_orbit wikiPageWikiLink File:Qzss-45-0.09.jpg.
- Tundra_orbit wikiPageWikiLinkText "Tundra elliptical orbit".
- Tundra_orbit wikiPageWikiLinkText "Tundra orbit".
- Tundra_orbit wikiPageWikiLinkText "Tundra".
- Tundra_orbit wikiPageWikiLinkText "tundra orbit".
- Tundra_orbit wikiPageUsesTemplate Template:Math.
- Tundra_orbit wikiPageUsesTemplate Template:More_footnotes.
- Tundra_orbit wikiPageUsesTemplate Template:Orbits.
- Tundra_orbit wikiPageUsesTemplate Template:Radical.
- Tundra_orbit wikiPageUsesTemplate Template:Reflist.
- Tundra_orbit subject Category:Earth_orbits.
- Tundra_orbit comment "A Tundra orbit (Russian: Тундра) is a highly elliptical geosynchronous orbit with a high inclination (usually near 63.4°) and an orbital period of one sidereal day (about 4 minutes less than a solar day). A satellite placed in this orbit spends most of its time over a chosen area of the Earth—a phenomenon known as apogee dwell.".
- Tundra_orbit label "Tundra orbit".
- Tundra_orbit sameAs Q846805.
- Tundra_orbit sameAs Tundra-Orbit.
- Tundra_orbit sameAs Orbite_toundra.
- Tundra_orbit sameAs Orbit_tundra.
- Tundra_orbit sameAs ツンドラ軌道.
- Tundra_orbit sameAs Órbita_Tundra.
- Tundra_orbit sameAs m.0cg0sc.
- Tundra_orbit sameAs Орбита_«Тундра».
- Tundra_orbit sameAs Tundra_yörünge.
- Tundra_orbit sameAs Q846805.
- Tundra_orbit wasDerivedFrom Tundra_orbit?oldid=695638295.
- Tundra_orbit depiction Qzss-45-0.09.jpg.
- Tundra_orbit isPrimaryTopicOf Tundra_orbit.