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- Highly_elliptical_orbit abstract "A highly elliptical orbit (HEO) is an elliptic orbit with a low-altitude (often under 1,000 kilometres (540 nmi)) perigee and a high-altitude (often over 35,786 kilometres (19,323 nmi)) apogee. The 'highly elliptical' term refers to the shape of the ellipse, and to the eccentricity e of the orbit, not to the high apogee altitude.Such extremely elongated orbits have the advantage of long dwell times at a point in the sky during the approach to, and descent from, apogee. Visibility near apogee can exceed twelve hours of dwell at apogee with a much shorter and faster-moving perigee phase. Bodies moving through the long apogee dwell can appear still in the sky to the ground when the orbit is at the right inclination, where the angular velocity of the orbit in the equatorial plane closely matches the rotation of the surface beneath. This makes these elliptical orbits useful for communications satellites.Sirius Satellite Radio uses HEO orbits to keep two satellites positioned above North America while another satellite quickly sweeps through the southern part of its 24-hour orbit. The longitude above which the satellites dwell at apogee in the small loop remains relatively constant as the earth rotates. The three separate orbits are spaced equally around the Earth, but share a common ground track.Examples of HEO orbits offering visibility over Earth's polar regions, which most geosynchronous satellites lack, are: Molniya orbits, named after the Molniya Soviet communication satellites which used them. Tundra orbitsMuch of Russia is at high latitude, so geostationary orbit does not provide full coverage of the region. These Soviet HEO orbits include polar coverage.[citation needed]".
- Highly_elliptical_orbit wikiPageID "654975".
- Highly_elliptical_orbit wikiPageRevisionID "599175164".
- Highly_elliptical_orbit hasPhotoCollection Highly_elliptical_orbit.
- Highly_elliptical_orbit subject Category:Earth_orbits.
- Highly_elliptical_orbit type EarthOrbits.
- Highly_elliptical_orbit type Line108593262.
- Highly_elliptical_orbit type Location100027167.
- Highly_elliptical_orbit type Object100002684.
- Highly_elliptical_orbit type Orbit108612049.
- Highly_elliptical_orbit type Path108616311.
- Highly_elliptical_orbit type PhysicalEntity100001930.
- Highly_elliptical_orbit type YagoGeoEntity.
- Highly_elliptical_orbit type YagoLegalActorGeo.
- Highly_elliptical_orbit type YagoPermanentlyLocatedEntity.
- Highly_elliptical_orbit comment "A highly elliptical orbit (HEO) is an elliptic orbit with a low-altitude (often under 1,000 kilometres (540 nmi)) perigee and a high-altitude (often over 35,786 kilometres (19,323 nmi)) apogee. The 'highly elliptical' term refers to the shape of the ellipse, and to the eccentricity e of the orbit, not to the high apogee altitude.Such extremely elongated orbits have the advantage of long dwell times at a point in the sky during the approach to, and descent from, apogee.".
- Highly_elliptical_orbit label "Highly elliptical orbit".
- Highly_elliptical_orbit label "Orbite elliptique élevée".
- Highly_elliptical_orbit label "Orbity silnie eliptyczne".
- Highly_elliptical_orbit label "Órbita elíptica alta".
- Highly_elliptical_orbit label "Высокая эллиптическая орбита".
- Highly_elliptical_orbit label "高椭圆轨道".
- Highly_elliptical_orbit sameAs Orbite_elliptique_élevée.
- Highly_elliptical_orbit sameAs Orbity_silnie_eliptyczne.
- Highly_elliptical_orbit sameAs Órbita_elíptica_alta.
- Highly_elliptical_orbit sameAs m.0300rx.
- Highly_elliptical_orbit sameAs Q38982.
- Highly_elliptical_orbit sameAs Q38982.
- Highly_elliptical_orbit sameAs Highly_elliptical_orbit.
- Highly_elliptical_orbit wasDerivedFrom Highly_elliptical_orbit?oldid=599175164.
- Highly_elliptical_orbit isPrimaryTopicOf Highly_elliptical_orbit.