Free-return trajectory
A free-return trajectory is a trajectory of a spacecraft traveling away from a primary body (for example, the Earth ) where gravity due to a secondary body (for example, the Moon ) causes the spacecraft to return to the primary body without propulsion (hence the term free ). [1]
Page Revisions
| Year | Metadata | Sections | Top Words | First Paragraph |
| 2018 |
26452 characters 4 sections 15 paragraphs 2 images 34 internal links 11 external links |
free 0.434 trajectory 0.375 return 0.371 moon 0.213 perigee 0.202 periselenum 0.181 apollo 0.165 circumlunar 0.164 cislunar 0.160 trajectories 0.145 schwaniger 0.135 transfer 0.109 earth 0.104 zubrin 0.103 radius 0.097 |
A free-return trajectory is a trajectory of a spacecraft traveling away from a primary body (for example, the Earth ) where gravity due to a secondary body (for example, the Moon ) causes the spacecraft to return to the primary body without propulsion (hence the term free ). [1] |
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| 2017 |
23504 characters 4 sections 12 paragraphs 2 images 32 internal links 8 external links |
free 0.455 return 0.416 trajectory 0.356 moon 0.221 periselenum 0.196 perigee 0.188 apollo 0.179 schwaniger 0.147 delta 0.123 zubrin 0.112 earth 0.108 radius 0.106 trajectories 0.105 transfer 0.102 sidereal 0.094 |
A free-return trajectory is a trajectory of a spacecraft traveling away from a primary body (for example, the Earth ) where gravity due to a secondary body (for example, the Moon ) causes the spacecraft to return to the primary body without propulsion (hence the term free ). [1] |
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| 2016 |
19934 characters 4 sections 11 paragraphs 1 images 28 internal links 6 external links |
free 0.455 return 0.406 trajectory 0.365 periselenum 0.211 moon 0.207 apollo 0.192 perigee 0.169 schwaniger 0.158 zubrin 0.121 radius 0.114 trajectories 0.113 transfer 0.110 sidereal 0.101 earth 0.095 delta 0.095 |
A free-return trajectory is a trajectory of a spacecraft traveling away from a primary body (for example, the Earth ) where gravity due to a secondary body (for example, the Moon ) causes the spacecraft to return to the primary body without propulsion (hence the term "free"). [1] |
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| 2015 |
12776 characters 2 sections 7 paragraphs 1 images 17 internal links 5 external links |
free 0.468 return 0.437 trajectory 0.380 perilune 0.314 apollo 0.286 moon 0.154 lunar 0.123 circumlunar 0.114 cislunar 0.111 maneuver 0.107 propulsion 0.093 module 0.090 applied 0.088 body 0.087 radius 0.085 |
A free-return trajectory is a trajectory of a spacecraft traveling away from a primary body (for example, the Earth ) where gravity due to a secondary body (for example, the Moon ) causes the spacecraft to return to the primary body without propulsion (hence the term "free"). [1] [2] |
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| 2014 |
12742 characters 2 sections 7 paragraphs 1 images 17 internal links 5 external links |
free 0.468 return 0.437 trajectory 0.380 perilune 0.314 apollo 0.286 moon 0.154 lunar 0.123 circumlunar 0.114 cislunar 0.111 maneuver 0.107 propulsion 0.094 module 0.091 applied 0.088 body 0.087 radius 0.085 |
A free-return trajectory is a trajectory of a spacecraft traveling away from a primary body (for example, the Earth ) where gravity due to a secondary body (for example, the Moon ) causes the spacecraft to return to the primary body without propulsion (hence the term "free"). [1] [2] |
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| 2013 |
11826 characters 2 sections 7 paragraphs 0 images 17 internal links 5 external links |
free 0.468 return 0.437 trajectory 0.380 perilune 0.314 apollo 0.286 moon 0.154 lunar 0.123 circumlunar 0.114 cislunar 0.111 maneuver 0.107 propulsion 0.094 module 0.091 applied 0.088 body 0.087 radius 0.085 |
A free-return trajectory is a trajectory of a spacecraft traveling away from a primary body (for example, the Earth ) where gravity due to a secondary body (for example, the Moon ) causes the spacecraft to return to the primary body without propulsion (hence the term "free"). [1] [2] |
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| 2012 |
13457 characters 2 sections 7 paragraphs 1 images 21 internal links 5 external links |
free 0.468 return 0.437 trajectory 0.380 perilune 0.314 apollo 0.286 moon 0.154 lunar 0.123 circumlunar 0.114 cislunar 0.111 maneuver 0.107 propulsion 0.094 module 0.091 applied 0.088 body 0.087 radius 0.085 |
A free-return trajectory is a trajectory of a spacecraft traveling away from a primary body (for example, the Earth ) where gravity due to a secondary body (for example, the Moon ) causes the spacecraft to return to the primary body without propulsion (hence the term "free"). [1] [2] |
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| 2011 |
9668 characters 1 sections 2 paragraphs 1 images 18 internal links 2 external links |
free 0.475 return 0.439 trajectory 0.381 apollo 0.362 lunar 0.173 maneuver 0.150 module 0.127 body 0.122 satellite 0.105 corridor 0.093 constraining 0.093 moon 0.087 secondary 0.083 primary 0.082 fated 0.082 |
A free return trajectory is one of a very small sub-class of trajectories in which the trajectory of a satellite traveling away from a primary body (for example, the Earth ) is modified by the presence of a secondary body (for example, the Moon ) causing the satellite to return to the primary body. [1] This method has been used by several spacecraft , most notably the Apollo 8 , Apollo 10 , and Apollo 11 lunar missions. Those spacecraft were launched into a free-return trajectory to allow their safe return in the event of a systems failure after launch. They all successfully inserted into orbit upon arriving at the Moon, and so did not take advantage of the free return. Due to the landing site restrictions that resulted from constraining the launch to a free return that flew by the Moon, subsequent Apollo missions, starting with Apollo 12 and including the ill-fated Apollo 13 , used a hybrid trajectory that launched to a highly elliptical Earth orbit that fell short of the Moon with effectively a free return to the atmospheric entry corridor. They then performed a mid-course maneuver to change to a trans-Lunar trajectory that was not a free return. This retained the safety characteristics of being on a free return upon launch, and only departed from free return once the systems were checked out and the lunar module was docked with the command module, providing back-up maneuver capabilities. [2] In fact, within hours of the accident, Apollo 13 used the lunar module to maneuver from its planned lunar orbit insertion trajectory to a free return trajectory. Apollo 13 was the only Apollo mission to actually complete a free return trajectory. |
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| 2010 |
9641 characters 1 sections 2 paragraphs 1 images 18 internal links 2 external links |
free 0.475 return 0.439 trajectory 0.381 apollo 0.362 lunar 0.173 maneuver 0.150 module 0.127 body 0.122 satellite 0.105 corridor 0.093 constraining 0.093 moon 0.087 secondary 0.083 primary 0.082 fated 0.082 |
A free return trajectory is one of a very small sub-class of trajectories in which the trajectory of a satellite traveling away from a primary body (for example, the Earth ) is modified by the presence of a secondary body (for example, the Moon ) causing the satellite to return to the primary body. [1] This method has been used by several spacecraft , most notably the Apollo 8 , Apollo 10 , and Apollo 11 lunar missions. Those spacecraft were launched into a free-return trajectory to allow their safe return in the event of a systems failure after launch. They all successfully inserted into orbit upon arriving at the Moon, and so did not take advantage of the free return. Due to the landing site restrictions that resulted from constraining the launch to a free return that flew by the Moon, subsequent Apollo missions, starting with Apollo 12 and including the ill-fated Apollo 13 , used a hybrid trajectory that launched to a highly elliptical Earth orbit that fell short of the Moon with effectively a free return to the atmospheric entry corridor. They then performed a mid-course maneuver to change to a trans-Lunar trajectory that was not a free return. This retained the safety characteristics of being on a free return upon launch, and only departed from free return once the systems were checked out and the lunar module was docked with the command module, providing back-up maneuver capabilities. [2] In fact within hours of the accident, Apollo 13 used the lunar module to maneuver from its planned lunar orbit insertion trajectory to a free return trajectory. Apollo 13 was the only Apollo mission to actually complete a free return trajectory. |
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| 2009 |
8605 characters 1 sections 2 paragraphs 1 images 18 internal links 2 external links |
apollo 0.462 trajectory 0.365 return 0.336 free 0.280 body 0.234 satellite 0.201 secondary 0.158 primary 0.158 fated 0.158 adjustments 0.140 course 0.139 ill 0.125 corrections 0.125 assistance 0.125 hybrid 0.117 |
A free return trajectory is one of a very small sub-class of trajectories in which the trajectory of a satellite traveling away from a primary body (for example, the Earth ) is modified by the presence of a secondary body (for example, the Moon ) causing the satellite to return to the primary body. [1] This method has been used by several spacecraft , most notably the Apollo 8 , Apollo 10 , and Apollo 11 lunar missions. Subsequent Apollo missions, starting with Apollo 12 and including the ill-fated Apollo 13 , used a similar hybrid trajectory requiring some minor course adjustments in order to successfully return to Earth. [2] |
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| 2008 |
5507 characters 0 sections 1 paragraphs 2 images 17 internal links 0 external links |
trajectory 0.432 return 0.332 free 0.332 body 0.277 satellite 0.238 popularised 0.201 secondary 0.187 primary 0.187 adjustments 0.166 corrections 0.148 assistance 0.148 hybrid 0.138 maneuvers 0.134 trajectories 0.134 correctly 0.132 |
A free return trajectory is one of a very small sub-class of trajectories in which the trajectory of a satellite traveling away from a primary body (for example, the Earth ) is modified by the presence of a secondary body (for example, the Moon ) causing the satellite to return to the primary body. This method has been used by spacecraft and was somewhat popularised by its use during the Apollo 13 mission, though this trajectory was actually a hybrid, requiring some minor adjustments. If performed correctly, a true free return trajectory is completed without the assistance of any mid-course corrections or maneuvers. The free return trajectory allows a great distance to be covered relatively directly without the use of additional fuel to return the satellite to the primary body, thus the term free . It is important to note that the satellite or spacecraft will not actually be captured by the secondary body without the use of its rocket engine to slow the craft. |
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| 2007 |
3768 characters 0 sections 1 paragraphs 1 images 12 internal links 0 external links |
trajectory 0.432 return 0.332 free 0.332 body 0.277 satellite 0.238 popularised 0.201 secondary 0.187 primary 0.187 adjustments 0.166 corrections 0.148 assistance 0.148 hybrid 0.138 maneuvers 0.134 trajectories 0.134 correctly 0.132 |
A free return trajectory is one of a very small sub-class of trajectories in which the trajectory of a satellite traveling away from a primary body (for example, the Earth ) is modified by the presence of a secondary body (for example, the Moon ) causing the satellite to return to the primary body. This method has been used by spacecraft and was somewhat popularised by its use during the Apollo 13 mission, though this trajectory was actually a hybrid, requiring some minor adjustments. If performed correctly, a true free return trajectory is completed without the assistance of any mid-course corrections or maneuvers. The free return trajectory allows a great distance to be covered relatively directly without the use of additional fuel to return the satellite to the primary body, thus the term free . It is important to note that the satellite or spacecraft will not actually be captured by the secondary body without the use of its rocket engine to slow the craft. |
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| 2006 |
3768 characters 0 sections 1 paragraphs 1 images 12 internal links 0 external links |
trajectory 0.432 return 0.332 free 0.332 body 0.277 satellite 0.238 popularised 0.201 secondary 0.187 primary 0.187 adjustments 0.166 corrections 0.148 assistance 0.148 hybrid 0.138 maneuvers 0.134 trajectories 0.134 correctly 0.132 |
A free return trajectory is one of a very small sub-class of trajectories in which the trajectory of a satellite traveling away from a primary body (for example, the Earth ) is modified by the presence of a secondary body (for example, the Moon ) causing the satellite to return to the primary body. This method has been used by spacecraft and was somewhat popularised by its use during the Apollo 13 mission, though this trajectory was actually a hybrid, requiring some minor adjustments. If performed correctly, a true free return trajectory is completed without the assistance of any mid-course corrections or maneuvers. The free return trajectory allows a great distance to be covered relatively directly without the use of additional fuel to return the satellite to the primary body, thus the term free . It is important to note that the satellite or spacecraft will not actually be captured by the secondary body without the use of its rocket engine to slow the craft. |