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velocity. It does not; it only requires a very high apogee which takes the craft toward the Moon.) A trajectory sufficient for translunar or interplanetary flight should not "care" whether a parking orbit is first reached. In other words, the delta v required for the Saturn V third stage to perform a direct Apollo translunar injection should be essentially equal to the delta v into orbit, plus the delta v required for the injection from orbit (possibly subject to the Oberth effect). It has nothing to do with "perigee"; obviously the perigee of the injection orbit equals the perigee of the parking orbit; "an arbitrarily low perigee that will never be reached" is essentially meaningless. And this was not why the Apollo program chose to use the parking orbit; that was for greater control of the launch window.
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This is nonsense, which was first added by an electrical engineer (not an expert in spaceflight). The amount of energy required for an "escape" mission is not determined by perigee, but by apogee of the "escape" orbit. (Another common misconception is that a lunar mission requires Earth escape
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and then performing a separate burn several orbits later onto a lunar trajectory. This costs additional propellant because the parking orbit perigee must be high enough to prevent reentry while direct injection can have an arbitrarily low perigee because it will never be reached.
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The reason the Apollo 15, 16 and 17 parking orbits were especially low was that the capabilities of the Saturn V were being stretched so these missions could carry a larger payload to the Moon than the prior missions did.
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Spaceflight is achieved by spacefaring capability. Both articles overlap significantly in content and can be covered in the same article.
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Apollo missions minimized the performance penalty of the parking orbit by keeping its altitude as low as possible. For example,
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I know of no reliable source documentation that says direct injection was ever considered for Apollo. What they considered was
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space vehicles successfully achieved very high altitudes without going into orbit.
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by 91.5 nmi (171Â km by 169Â km) where there was significant atmospheric drag.
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The merge can take place, which does not stop such list to be created.
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I'm pretty sure I'm supposed to get rid of it (I'm new to wikipedia)
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It's been six years and it still hasn't been removed.
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19:This is the
1881:. Also see
1560:Soumyabrata
1438:Spaceflight
1436:duplicates
1434:Spacefaring
1412:Spacefaring
1299:Spaceflight
1212:Sourcecheck
1171:Spaceflight
1050:Spaceflight
1019:its history
1014:Spaceflight
1005:Spacefaring
957:written in
746:WikiProject
335:Spaceflight
326:spaceflight
282:Spaceflight
148:free images
31:not a forum
25:Spaceflight
1906:Categories
1400:Report bug
1046:To-do list
1008:page were
1873:, launch
1669:Apollo 15
1612:complete.
1383:this tool
1376:this tool
1265:this tool
1258:this tool
251:is rated
88:if needed
71:Be polite
21:talk page
1890:Dulliman
1843:unsigned
1751:Cheers,
1568:subpages
1389:Cheers.—
1271:Cheers.—
1109:Rewrite
972:traveled
199:365Â days
186:Archives
56:get help
29:This is
27:article.
1867:complex
1832:look...
1647:Russian
1615:Klbrain
1577:Support
1556:Support
1533:Comment
1486:Comment
1470:Support
1453:Support
1303:my edit
1281::Online
1198:checked
1175:my edit
1104:Cleanup
1074:refresh
1062:history
968:defense
927:on the
795:on the
677:on the
572:on the
545:Physics
536:Physics
492:Physics
467:on the
440:Science
431:Science
387:Science
362:on the
253:C-class
154:WPÂ refs
142:scholar
1655:Apollo
1610:Merger
1457:PopSci
1206:failed
1123:Expand
1010:merged
893:Alerts
768:Russia
750:Russia
702:Russia
259:scale.
126:Google
1875:tower
1068:watch
1012:into
964:color
240:This
169:JSTOR
130:books
84:Seek
1894:talk
1877:and
1851:talk
1823:talk
1790:talk
1757:talk
1726:talk
1712:talk
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1651:NASA
1619:talk
1585:talk
1545:talk
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1477:talk
1461:talk
1446:talk
1202:true
1056:edit
1048:for
919:High
787:High
744:, a
669:High
564:High
459:High
162:FENS
136:news
73:and
1871:pad
1817:. —
1784:. —
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1673:nmi
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1488:at
1357:RfC
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354:Top
176:TWL
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