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- Launch_window abstract "In the context of spaceflight, a launch window is a time period during which a particular vehicle (rocket, Space Shuttle, etc.) must be launched in order to reach its intended target. If the rocket is not launched within the "window", it has to wait for the next window.For trips into largely arbitrary Earth orbits, almost any time will do. But if the spacecraft intends to rendezvous with a space station (such as the International Space Station) or another vehicle already in an orbit, the launch must be carefully timed to occur around the times that the target vehicle's orbital plane intersects the launch site.For launches above low Earth orbit (LEO), the actual launch time can be somewhat flexible if a parking orbit is used, because the inclination and time the spacecraft initially spends in the parking orbit can be varied. See the launch window used by the Mars Global Surveyor spacecraft to the planet Mars at [1].To go to another planet using the simple low-energy Hohmann transfer orbit, if eccentricity of orbits is not a factor, launch windows are periodic according to the synodic period; for example, in the case of Mars the period is 2.135 years, i.e. 780 days. In more complex cases, including the use of gravitational slingshots, launch windows are irregular. Sometimes rare opportunities arise such as when Voyager 2 took advantage of a 175 year planetary alignment (launch window) to visit Jupiter, Saturn, Uranus and Neptune. When such an opportunity is missed, another target may be selected. For example, the Rosetta mission of ESA was originally intended for comet 46P/Wirtanen, but a launcher problem delayed it and a new target had to be selected (comet 67P/Churyumov-Gerasimenko).Launch windows are often calculated from porkchop plots that show the delta-v needed to achieve the mission, plotted against the launch time.".
- Launch_window wikiPageExternalLink window.html.
- Launch_window wikiPageID "155759".
- Launch_window wikiPageRevisionID "596837551".
- Launch_window hasPhotoCollection Launch_window.
- Launch_window subject Category:Spaceflight_concepts.
- Launch_window comment "In the context of spaceflight, a launch window is a time period during which a particular vehicle (rocket, Space Shuttle, etc.) must be launched in order to reach its intended target. If the rocket is not launched within the "window", it has to wait for the next window.For trips into largely arbitrary Earth orbits, almost any time will do.".
- Launch_window label "Fenêtre de lancement".
- Launch_window label "Janela de lançamento".
- Launch_window label "Launch window".
- Launch_window label "Okno startowe".
- Launch_window label "Startfenster".
- Launch_window label "Ventana de lanzamiento".
- Launch_window label "Стартовое окно".
- Launch_window label "打上げウィンドウ".
- Launch_window label "發射窗口".
- Launch_window sameAs Startovací_okno.
- Launch_window sameAs Startfenster.
- Launch_window sameAs Ventana_de_lanzamiento.
- Launch_window sameAs Fenêtre_de_lancement.
- Launch_window sameAs 打上げウィンドウ.
- Launch_window sameAs Okno_startowe.
- Launch_window sameAs Janela_de_lançamento.
- Launch_window sameAs m.014dwg.
- Launch_window sameAs Q855377.
- Launch_window sameAs Q855377.
- Launch_window wasDerivedFrom Launch_window?oldid=596837551.
- Launch_window isPrimaryTopicOf Launch_window.