Timeline for What would be the trajectory and initial speed of a chunk launched from Phobos to get as close as possible to any pole of Mars?
Current License: CC BY-SA 4.0
14 events
| when toggle format | what | by | license | comment | |
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| Jul 9, 2021 at 17:27 | vote | accept | Cornelis | ||
| Jul 9, 2021 at 8:45 | history | edited | Cornelis | CC BY-SA 4.0 |
deleted 14 characters in body
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| Jul 9, 2021 at 8:39 | history | edited | Cornelis | CC BY-SA 4.0 |
removed the Coriolis force part
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| Jul 9, 2021 at 8:29 | comment | added | Cornelis | That's a clear explanation ! I didn't have the time last night to read the answer thoroughly, which I will do right now. Especially I'm curious about the cheaper solution. Of course the Coriolis force has nothing to do with this at all, so I'll remove that part. | |
| Jul 9, 2021 at 7:57 | comment | added | uhoh | Phobos is moving at roughly 2.1 km/sec. If you aim directly at the pole you will never hit the pole because along with whatever delta-v your push is, in the frame centered on the planet it will also have that sideways velocity because it was shot moving along with Phobos. To enter into a polar orbit or planet that contains the poles, you have to shoot backwards somewhat. It seems that the answer explains the same thing, you aim mostly backwards (retrograde) and somewhat polar (zenith). So you can't launch in the direction of the pole from the moving moon if you want to hit the pole. | |
| Jul 9, 2021 at 7:08 | comment | added | Cornelis | @uhoh You can only give the chunk on Phobos one initial push. When you launch it into the direction of the north pole, that direction is perpendicular to the orbit parallel to the equator, isn't it ? But I'm amazed right now that it's so simple to get there inside a vertical plane through that pole. | |
| Jul 9, 2021 at 6:00 | history | tweeted | twitter.com/StackSpaceExp/status/1413377376050892804 | ||
| Jul 8, 2021 at 23:05 | history | became hot network question | |||
| Jul 8, 2021 at 22:12 | comment | added | uhoh | What does "launching... from Phobos into the direction of any martian pole" mean? For example, does it mean pointing a rocket at the pole and pushing the launch button? Or does it mean launching at a backwards angle zeroing out Phobos' forward orbital velocity which it seems the first answer might assume. (What would happen if you fired a gun on a train moving as fast as a bullet? "If you shoot the bullet off the back of the train... (r)elative to the ground, the bullet will not be moving at all, and it will drop straight to the ground.") | |
| Jul 8, 2021 at 16:52 | history | edited | Cornelis | CC BY-SA 4.0 |
verification
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| Jul 8, 2021 at 16:05 | answer | added | SE - stop firing the good guys | timeline score: 9 | |
| Jul 8, 2021 at 15:35 | history | edited | Cornelis | CC BY-SA 4.0 |
perpendicular
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| Jul 8, 2021 at 15:06 | history | edited | Cornelis | CC BY-SA 4.0 |
changed the image
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| Jul 8, 2021 at 14:59 | history | asked | Cornelis | CC BY-SA 4.0 |