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Subsynchronous orbit
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<h2 id="technical-considerations">Technical considerations</h2> <p>An Earth satellite that is in (a <a href="/facts/Retrograde_motion/1HCbwQqy">prograde</a>) subsynchronous orbit will appear to drift eastward as seen from the Earth's surface.<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a> </p> <h2 id="economic-importance-in-commercial-spaceflight">Economic importance in commercial spaceflight</h2> <p>The <i><a href="/facts/Geosynchronous_orbit/nR2yaeUg">Geosynchronous-belt</a> subsynchronous orbital regime</i> is regularly used in <a href="/facts/Spaceflight/zPrnATzo">spaceflight</a>. This orbit is typically used to house working <a href="/facts/Communication_satellites/y5RXPMDT">communication satellites</a> that have not yet been deactivated, and may be still be used again in <a href="/facts/Geostationary_orbit/VBq1v5Kr">geostationary</a> service if the need arises.<a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a> </p> <h2 id="see-also">See also</h2> <ul><li><a href="/facts/Supersynchronous_orbit/Ge5ssJq4">Supersynchronous orbit</a></li> <li><a href="/facts/List_of_orbits/l5bSKRcJ">List of orbits</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Maral, Gérard; Michel Bousquet; Zhili Sun (2009). Satellite communications systems : systems, techniques and technology. Wiley. OCLC 701718866. <a href="/wiki/OCLC_(identifier)" target="_blank">/wiki/OCLC_(identifier)</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Maral, Gérard; Michel Bousquet; Zhili Sun (2009). Satellite communications systems : systems, techniques and technology. Wiley. OCLC 701718866. <a href="/wiki/OCLC_(identifier)" target="_blank">/wiki/OCLC_(identifier)</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Kumar, Krishna (March 1993). "Geosynchronous satellites at sub-synchronous altitudes". Acta Astronautica. 29 (3): 149–151. Bibcode:1993AcAau..29..149K. doi:10.1016/0094-5765(93)90043-V. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> </ol>