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- Q1063974 subject Q14623782.
- Q1063974 subject Q8396626.
- Q1063974 abstract "A Molniya orbit (Russian: Молния; IPA: [ˈmolnʲɪjə], "Lightning") is a type of highly elliptical orbit with an inclination of 63.4 degrees, an argument of perigee of −90 degrees and an orbital period of one half of a sidereal day. Molniya orbits are named after a series of Soviet/Russian Molniya communications satellites which have been using this type of orbit since the mid-1960s.A satellite in a highly eccentric orbit spends most of its time in the neighborhood of apogee which for a Molniya orbit is over the Northern Hemisphere, the sub-satellite point at apogee having a latitude of 63.4 degrees north. As the apogee altitude is as high as 40,000 km, it will therefore, for a considerable period around apogee, have an excellent visibility from the Northern Hemisphere, from the Russian Federation but also from northern Europe, Greenland and Canada.To get a continuous high elevation coverage of the Northern Hemisphere, at least three Molniya spacecraft are needed.The reason that the inclination should have the value 63.4° is that then the argument of perigee is not perturbed by the J2 term of the gravitational field of the Earth but stays at −90°.".
- Q1063974 thumbnail NASA_molniya_oblique.png?width=300.
- Q1063974 wikiPageExternalLink www.astronautix.com.
- Q1063974 wikiPageExternalLink molniya1.htm.
- Q1063974 wikiPageExternalLink viewer.htm?TITLE=Molniya.
- Q1063974 wikiPageExternalLink work.html.
- Q1063974 wikiPageExternalLink orbmech.htm.
- Q1063974 wikiPageExternalLink ?s=27834.
- Q1063974 wikiPageExternalLink watch?v=O_Iykeouj3g.
- Q1063974 wikiPageExternalLink primer96.htm.
- Q1063974 wikiPageWikiLink Q1254874.
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- Q1063974 wikiPageWikiLink Q14623782.
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- Q1063974 wikiPageWikiLink Q7865636.
- Q1063974 wikiPageWikiLink Q83481.
- Q1063974 wikiPageWikiLink Q8396626.
- Q1063974 wikiPageWikiLink Q846805.
- Q1063974 comment "A Molniya orbit (Russian: Молния; IPA: [ˈmolnʲɪjə], "Lightning") is a type of highly elliptical orbit with an inclination of 63.4 degrees, an argument of perigee of −90 degrees and an orbital period of one half of a sidereal day.".
- Q1063974 label "Molniya orbit".
- Q1063974 depiction NASA_molniya_oblique.png.