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-> ⟨raptop | ²³⁹Pu powered⟩ https://things.uk/@eclectech/113588936051510919
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<queqiao-> ⟨piuc⟩ How can i see Kerbin orbit around kerbol in the tracking station ?
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<raptop> Today in n-body methods: https://arxiv.org/abs/2412.02124
<queqiao-> ⟨Ernos⟩ Not sure if this is a principia issue or MJ issue, but I'm using Principia to plot a TLI burn, activating my TLI engine, telling Principia to use active engines for burn duration, refining the plot, then telling MJ to execute the burn. Principia is showing a burn time like double the total burn time of my TLI stage, and MJ is way overshooting the burn, leaving me in entirely messed up orbits. This image is post-burn showing the...
<queqiao-> ... trajectory errors and odd burn time in Principia. I've used this exact process and an almost identical TLI stage before with no issue, so I'm not sure what's causing the issue here
<queqiao-> ⟨Ernos⟩ my TLI stage only has 123 seconds of burn time and 3435m/s of dV, which is more dV than I'm planning in the burn
<queqiao-> ⟨Ernos⟩ * dV (about 3400 due to boiloff by time of burn),
<queqiao-> ⟨nazfib⟩ > Principia is showing a burn time like double the total burn time of my TLI stageThis is a problem: that means that Principia hasn't correctly determined the thrust and/or mass of the initial vessel; that will mess up the timing of the burn. Does some combination of clicking "Rebase" and then "Active engines" make the burn duration correct?
<queqiao-> If that doesn't help, can you share a screenshot with the burn planned, but not yet executed?
<queqiao-> ⟨Ernos⟩ uh yeah one sec, haven't used Principia's planning tools much so I'm still pretty inexperienced with it
<queqiao-> ⟨Ernos⟩ I've not tried rebase bc idk what that does and I don't wanna risk messing something up in my plot
<queqiao-> ⟨Ernos⟩ my burn planned pre-execution. I've staged my TLI engine and told it to use active engines, and it has a 207 second burntime, more than I have fuel for
<queqiao-> ⟨Ernos⟩ rebase then active engines seems to have fixed it, lemme execute and see if it works as expected
<queqiao-> ⟨lamont⟩ Thread
<queqiao-> ⟨Ernos⟩ ok yeah after doing rebase then active engines, MJ did the burn as expected, thanks for the help!
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