egg changed the topic of #principia to: Logs: https://esper.irclog.whitequark.org/principia | <scott_manley> anyone that doubts the wisdom of retrograde bop needs to get the hell out | https://xkcd.com/323/ | <egg> calculating the influence of lamont on Pluto is a bit silly…
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<queqiao-_>
⟨Paculino (ŝi/ri/she/they)⟩ Is that your fattest cat so far?
<queqiao-_>
⟨Quadrupole⟩ Although this means you are not necessarily launching due east, so it is not optimal.
<queqiao-_>
⟨Dost Thou Even Shred⟩ I heard from one place that you can use the navball connected to the moon and using the line that splits the color change. If that makes since
<queqiao-_>
⟨Dost Thou Even Shred⟩ does that actually work
<queqiao-_>
⟨Dost Thou Even Shred⟩ but im considering just waiting to use principia just cause i didnt realize how much of a challenge its looking to be
<queqiao-_>
⟨Quadrupole⟩ I suppose you are talking about the ECI navball (the grey one). In that case, when the moon is on the color change line, it is on earth's equator, i.e. on AN/DN.
<queqiao-_>
⟨Dost Thou Even Shred⟩ no the LCI i think its called
<queqiao-_>
⟨Dost Thou Even Shred⟩ the purple and light purple when you change your reference to the moon
<queqiao-_>
⟨Quadrupole⟩ I guess LCI and ECI are the same for this purpose? As only earth's obliquity was implemented.
<queqiao-_>
⟨Quadrupole⟩ So the equator for the earth and the moon are parallel
<queqiao-_>
⟨Quadrupole⟩ Also I think the purple one (barycentric) is no longer used.
<queqiao-_>
⟨Dost Thou Even Shred⟩ well i guess i have an older version cause i could use it
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<queqiao-_>
⟨Dost Thou Even Shred⟩ but i was implying using the barycentric navball with the moon to line up
<queqiao-_>
⟨Dost Thou Even Shred⟩ thats what i saw some people say works
<queqiao-_>
⟨Quadrupole⟩ I am not sure about those methods, but I can tell you my way of eyeballing moon windows besides using kOS scripts.
<queqiao-_>
⟨Quadrupole⟩ If you match LAN with the moon, your orbital plane will intercept the moon's one at exactly AN/DN, so you need to launch three to five days before the moon reach AN/DN.
<queqiao-_>
⟨Dost Thou Even Shred⟩ so how exactly do you do that
<queqiao-_>
⟨Quadrupole⟩ Go to the tracking station, switch to the ECEF frame, and wait until the orbit of the moon (now should be a spiral) repeats itself. This is when the moon has passed its highest/lowest point for 12 hours.
<queqiao-_>
⟨Quadrupole⟩ The sidereal period of the moon is about 28 days, so it takes 7 days to go from the highest/lowest point to one of the nodes. Therefore you should launch two to three days after the orbit repeats to go to the moon in three to five days.
<queqiao-_>
⟨Quadrupole⟩ Though his code gives two windows per day, whereas mine gives two per month. This is because mine launches at the minimum relative inclination.
<queqiao-_>
⟨Quadrupole⟩ Which is irrelevant for lunar impactors.
<queqiao-_>
⟨Dost Thou Even Shred⟩ what about flybys
<queqiao-_>
⟨Dost Thou Even Shred⟩ also when does the spiral exactly repeat
<queqiao-_>
⟨Dost Thou Even Shred⟩ also does itsRyans script just set up the time and not the launch
<queqiao-_>
⟨Dost Thou Even Shred⟩ and finally is there a new tutorial with maneuvers and other things cause ive been looking at the old one
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<queqiao-_>
⟨Dost Thou Even Shred⟩ cause i know ill need it for later especially going interplanetary
<queqiao-_>
⟨egg⟩ That’s launching into the plane of the target body (there is no purple navball anymore, you want the orange one), but that only works if you don’t launch from something that’s too far north
<queqiao-_>
⟨egg⟩ Florida is too far North
<queqiao-_>
⟨egg⟩ Florida man attempts to launch into the orbital plane of the moon, waits 18 years for launch window
<queqiao-_>
⟨egg⟩ You can do that if you launch from Kourou, otherwise things are very hard and you have to use something like Butcher’s script
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<queqiao-_>
⟨Butcher⟩ You can warp forward until it is an easterly launch.
<_whitenotifier>
[Principia] pleroy opened pull request #3152: Cleanup and simplification of new-style discrete trajectory - https://git.io/JK3NP
<_whitenotifier>
[Principia] pleroy edited pull request #3152: Cleanup and simplification of new-style discrete trajectory classes - https://git.io/JK3NP
<_whitenotifier>
[Principia] eggrobin labeled pull request #3152: Cleanup and simplification of new-style discrete trajectory classes - https://git.io/JK3NP