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…
<queqiao->
⟨egg⟩ that book does not contain any windows, no
<raptop>
I recommend cooking up some porkchop plots to find the launch windows
<queqiao->
⟨Serina⟩ Hooow would one do that?
<queqiao->
⟨pEdro⟩ First you get some program to calculate flight paths, the programm wait until its well-done and puts it into a graph
<queqiao->
⟨pEdro⟩ Mechjeb has one integratrd
<queqiao->
⟨pEdro⟩ Mechjeb has one integrated, ∆V is somewhat wrong, but windows are generally good (edited)
<queqiao->
⟨pEdro⟩ Then there are multiple Flyby calculators for more advanced windows
<queqiao->
⟨Paculino (ŝi/ri/she/they)⟩ There is a NASA webpage that does it, but only between 2010 and 2040, and only for certain destinations
<queqiao->
⟨pEdro⟩ accuracy is questionable, but good enough for you to work it out yourself
<queqiao->
⟨Serina⟩ @pEdro Don't you need to already be in orbit for that to work?
<queqiao->
⟨Serina⟩ would be nice to have an up to date flyby calculator
<queqiao->
⟨pEdro⟩ flyby finder is somewhat accurate
<queqiao->
⟨Serina⟩ define somewhat
<raptop>
What does up to date mean in this context? Retrobop has been around for what, 5 years?
<queqiao->
⟨pEdro⟩ windows are slightly off in later years
<queqiao->
⟨Serina⟩ As in it works well with the current version of RSS
<queqiao->
⟨Paculino (ŝi/ri/she/they)⟩ Isn't that what the alternate initial positions files are for?
<queqiao->
⟨Serina⟩ oh you can correct that as you go along with flyby finder?
<queqiao->
⟨egg⟩ wait what ? Those were a workaround for a part of 2400 that no longer exist
<queqiao->
⟨egg⟩ and as a result you probably shouldn’t use them
<queqiao->
⟨egg⟩ and as a result you probably shouldn’t use them anymore (edited)
<queqiao->
⟨Paculino (ŝi/ri/she/they)⟩ Oh... I thought they helped the positions be more accurate in later years
<queqiao->
⟨egg⟩ No, our solar system is as accurate as you can realistically want for as long as you can realistically warp
<queqiao->
⟨Paculino (ŝi/ri/she/they)⟩ I used them to start off in the year I wanted in sandbox so I could test something, without timewarping
<queqiao->
⟨egg⟩ You can do that by just editing the game_epoch, no need for a wholly different initial state
<queqiao->
⟨Paculino (ŝi/ri/she/they)⟩ Would the launch windows be all messed up then?
<queqiao->
⟨egg⟩ (that will then cause us to compute the solar system until the right time, but very quickly)
<queqiao->
⟨Paculino (ŝi/ri/she/they)⟩ Oh.... I wish I knew that earlier
<queqiao->
⟨egg⟩ (editing the game_epoch and the corresponding date in RSSTimeFormatter really)
<queqiao->
⟨Serina⟩ so the Flybyfinder for Real Solar System Mod v0.85 is fully compatible with how RSS has it's solar system?
<queqiao->
⟨Serina⟩ in it's current state?
<queqiao->
⟨egg⟩ Given that the interplanetary launch windows are the same as in stock (Principialess) RSS, you may want to ask in a channel with a broader scope
<queqiao->
⟨Serina⟩ oh really?
<queqiao->
⟨Serina⟩ or isn't orbital pertubation between the bodies simulated in principia? I thought that would play a role
<queqiao->
⟨egg⟩ Yes, but by and large the planets follow relatively-unperturbed Kepler orbits, and windows are about high-energy transfers that don’t do much in the way of third-body-effect fanciness
<queqiao->
⟨Serina⟩ I see
<queqiao->
⟨pEdro⟩ you can often find cheaper transfers by noodling about unstable points, but for "normal" fast transfers they are mostly correct
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<queqiao->
⟨Serina⟩ Well those are more once in a blue moon gotta know what to look for transfers, to complicated for babeh's first principia run
<queqiao->
⟨pEdro⟩ Yeah, really fun to use low energy transfers, even if they take several decades
<queqiao->
⟨Paculino (ŝi/ri/she/they)⟩ I use several month long ones to get to the moon the first two or three times
<queqiao->
⟨pEdro⟩ for RP1 you need to constrain yourself, packing 100m/s ∆V more is generally better than waiting several months for lunar capture.
<queqiao->
⟨Serina⟩ I mean yeah, it might be useful for shimmying around the earth moon Lagrange points but it's... not particularly time efficient way of moving around
<queqiao->
⟨pEdro⟩ You still end up using them sometimes, but only if you are trying to do extreme :caveman: stuff or if your engine breaks down during flight
<_whitenotifier>
[Principia] pleroy closed pull request #3102: Remove the zfp flag and fix a typo - https://git.io/J0FuG
<_whitenotifier>
[Principia] pleroy pushed 2 commits to master [+0/-0/±2] https://git.io/J0FMr
<_whitenotifier>
[Principia] pleroy opened pull request #3103: Add support for storing the exact degrees of freedom at some points of a trajectory - https://git.io/J0FDe