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-> ⟨sichelgaita⟩ It would be possible to have a distant body representing the galactic centre, and maybe with proper spherical harmonics we could approximate the shape of its field. There may be some issues with numerical accuracy, but mostly over the time frame of a game there is no way that you could distinguish the capture of an object from a simple comet.
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<queqiao-> ⟨clayel⟩ you'd probably need to fake the motion a bit right, since the orbit of a galaxy is dependent on mostly dark matter and not mass? (or would that not matter)
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<queqiao-> ⟨Kirk (He/Him)⟩ Dark matter is mass
<_whitenotifier-e998> [Principia] pleroy closed pull request #4040: Improve the documentation and tests of LLL - https://github.com/mockingbirdnest/Principia/pull/4040
<_whitenotifier-e998> [Principia] pleroy closed pull request #4039: UnitriangularGramSchmidt for matrices with a zero column - https://github.com/mockingbirdnest/Principia/pull/4039
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<raptop> hrm, disk shenanigans https://arxiv.org/abs/2407.11648
<_whitenotifier-e998> [Principia] pleroy opened pull request #4041: A unit test for generating accurate tables - https://github.com/mockingbirdnest/Principia/pull/4041
<queqiao-> ⟨kaborl⟩ I have absolutely no idea what I'm doing here or what I'm looking at.
<queqiao-> ⟨test_account9540⟩ at the trajectory of your vessel relative to another vessel
<queqiao-> ⟨test_account9540⟩ unfortunately, when their orbits are not similar and prediction length is long, the result is unreadable
<queqiao-> ⟨egg⟩ As usual, the question is _what are you trying to do?_
<queqiao-> ⟨egg⟩ What you should be look at depends on that.
<queqiao-> ⟨butcher6994⟩ Closest approach is 17m on the plan, so I guess that's a plan for a successful intercept.
<queqiao-> ⟨test_account9540⟩ it will take 129m/s though to match orbits after this intercept, sounds quite a lot for lunar rendezvous
<paculino> Dramatic tuxedo
<queqiao-> ⟨kaborl⟩ Me, now.
<queqiao-> ⟨test_account9540⟩ I would suggest to remove the flight plan at first and look at just the magenta line to understand what is going on
<queqiao-> Moreover, try to decrease the length of the magenta line (prediction length). Unfortunately, it can't be done directly but you can achieve the results by playing with tolerance and steps settings in the main principia window.
<queqiao-> ⟨test_account9540⟩ Ideally you will see a shorter magenta line that shows how your ship moves relative to the target and these markers on it show the moments when ships approach each other
<queqiao-> ⟨test_account9540⟩ Then you can try doing some little maneuvers with RCS and see how the line changes, which gives an idea what you need to do to approach the target if the orbits are already similar. But first you need to make them similar.
<queqiao-> ⟨test_account9540⟩ I would suggest to remove the flight plan at first and look at just the magenta line to understand what is going on
<queqiao-> Moreover, try to decrease the length of the magenta line (prediction length). Unfortunately, it can't be done directly but you can achieve the result by playing with tolerance and steps settings in the main principia window.
<queqiao-> ⟨test_account9540⟩ Ideally you will see a shorter magenta line that shows how your ship moves relative to the target and these markers on it show the moments when the ships approach each other
<queqiao-> ⟨kaborl⟩ I managed to make it, but it's difficult for me to reproduce it. I couldn't understand which node was which etc. I focused on getting a resonant orbit with the target which eventually I managed. But what an adventure. Then I did make the purple line to match the planned one. Why? Well, cause why not. I can only imagine what's happening in the orbit, but it's quite complicated to understand. It was also my very first rendevouz using...
<queqiao-> ... Principia so I skipped doing in at Earth and everything. I guess that's something I'll eventually understand. But oh, god.
<queqiao-> ⟨kaborl⟩ Also, the performance was pretty sad. I probably need to tweak the prediction and history better.
<queqiao-> ⟨test_account9540⟩ I set history to 0
<queqiao-> ⟨test_account9540⟩ The less clutter the better
<queqiao-> ⟨kaborl⟩ That's true.
<queqiao-> ⟨kaborl⟩ Is there any way to identify which one if the market that shows the closest approach, or do I just to hover the mouse on each one of these until I find it?
<queqiao-> ⟨test_account9540⟩ Hover i think
<queqiao-> ⟨test_account9540⟩ But if there are a lot of close markers, i just play with rcs until one of them gets really close:)
<queqiao-> ⟨lpg4999⟩ in case it wasn't obvious, "the closest approach" would be the marker that is _literally_ closest to the target where it is displayed
<queqiao-> ⟨lpg4999⟩ that's one advantage of the target reference frame, compared to patched conics: the position of the target isn't just its position now, it's its position later
<queqiao-> ⟨lpg4999⟩ (personally I'd do the exact opposite of what test_account suggests; completely hide the purple line and _only_ look the plan line)
<queqiao-> ⟨lpg4999⟩ +at
<queqiao-> ⟨test_account9540⟩ Its probably because you plan it. I just do little maneuvers without making a flight plan at all
<queqiao-> ⟨lpg4999⟩ yes, that's mainly for the " But first you need to make them similar" part
<queqiao-> ⟨test_account9540⟩ I would probably do this first part with planning but not in the target reference frame. And switch to target frame only when the orbits are already similar. Otherwise it's just a mess.