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-> ⟨zxjoshxz⟩ Well it would be a higher point to transmit too meaning you need less complete coverage
<queqiao-> ⟨zxjoshxz⟩ * to
<raptop> ...this feels relevant to σκοποσ for some reason https://arxiv.org/abs/2308.07005
<queqiao-> ⟨test_account9540⟩ Skopos is about earth satellites and this is about interplanetary atmospheric probes 🤔
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<queqiao-> ⟨drveyl⟩ Skopos is about planetary observation and about writing mission requirements instead of prescribing a specific orbit as a solution.
<queqiao-> ⟨drveyl⟩ +as a class of problems
<queqiao-> ⟨rocketdyne_h1⟩ Are vector space curves what Principia uses to visualize trajectories
<queqiao-> ⟨Al₂Me₆⟩ ‘Vector space curves’, in contrast to?
<queqiao-> ⟨blackeagle_612⟩ I mean. Even stock uses these curved, but just with one fixed inertial frame, from how i understand it?
<queqiao-> ⟨blackeagle_612⟩ * curves,
<queqiao-> ⟨rocketdyne_h1⟩ ⟪blackeagle_612⟫ I mean. Even stock uses these curves, […] ⮪ I mean that it uses more than just the conic sections
<queqiao-> ⟨blackeagle_612⟩ Well I would say no. Because it has entirely to do with the perspective you look from at the trajectory of a vessel. And so its again just a question of "Whats your interial reference frame?"
<queqiao-> ⟨blackeagle_612⟩ If you wamt to understand, why these different space noodles appear, i would suggest reading the part about concepts in the Principia Wiki.
<queqiao-> ⟨blackeagle_612⟩ * want
<queqiao-> ⟨Al₂Me₆⟩ ⟪rocketdyne_h1⟫ I mean that it uses more than just the […] ⮪ Well as soon as you have more than two bodies the trajectories cease to be perfect conics at all, regardless of the reference frame. It is unclear to me what is meant by 'vector space curve', since any continuous mapping ℝ -> ℝ³ seems to fall under that classification?
<queqiao-> AFAIUI Principia stores the trajectories by fitting them to polynomials, which are then adaptively downsampled for display.
<queqiao-> ⟨rocketdyne_h1⟩ ⟪blackeagle_612⟫ If you want to understand, why these […] ⮪ Yeah I understand that part
<queqiao-> It's just how Principia implements them that I know nothing about
<queqiao-> ⟨lamont⟩ I'd guess that since principia uses symplectic integrators for celestials and on-rails that timesteps already have to be fixed so the integration can just happen in any reference frame, then the coordinates are transformed to the desired reference frame and fit to polynomials. i probably wouldn't bother with transforming the equations of motion and doing the integration in the target reference frame, although egg is a bit mad so...
<queqiao-> ... maybe it does...
<queqiao-> ⟨unboundedbirch8⟩ how do i go about putting making a manoeuvre so that my satelite will be 1/4 out out of phase with another satelite
<queqiao-> ⟨blackeagle_612⟩ In geostationary orbit? Or whats the orbital situation you want to achieve?
<queqiao-> ⟨unboundedbirch8⟩ its not geostationary but this is what i want to achieve going from a 200x200 orbit into a transfer orbit that will reach apoapsis being 1/4 phase out with the target satelite
<queqiao-> ⟨blackeagle_612⟩ You basicly have shown the answer yourself. Use the transferorbit and let the vessel phase until it is 1/4 ahead of after the vessel thats already in the final orbit. Then do the second half of the homanntransfer.
<queqiao-> ⟨unboundedbirch8⟩ alright thanks
<queqiao-> ⟨blackeagle_612⟩ * or behind
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<queqiao-> ⟨jasman3764⟩ I can't get Mechjeb to execute a Principia node. The burn never starts. Any ideas?
<queqiao-> ⟨blackeagle_612⟩ Did you use "execute next principia node" from maneuver planer?
<queqiao-> ⟨jasman3764⟩ ⟪blackeagle_612⟫ Did you use "execute next principia […] ⮪ yes
<queqiao-> ⟨blackeagle_612⟩ Mhhh. Any screenshot or specific info when this happens?
<queqiao-> ⟨jasman3764⟩ I will go into the game again a little later and post a screenshot
<queqiao-> ⟨Al₂Me₆⟩ (Might want to mention in the change log that the phantom marker issue has been fixed?)
<queqiao-> ⟨lamont⟩ *@egg* any help on what ksp_plugin/ksp_plugin_adapter API to hit to pull BCI coordinates off of the end of a maneuver burn / beginning of the next arc?
<queqiao-> ⟨egg⟩ I don’t know whether we have such a thing.
<queqiao-> ⟨Al₂Me₆⟩ ⟪lamont⟫ @egg any help on what […] ⮪ Closed-loop guidance? 👀
<queqiao-> ⟨lamont⟩ yeah i got kind of lost in things that looked promising but weren't quite it
<queqiao-> ⟨egg⟩ If this is for prototyping, do you know how to write an interface function ?
<queqiao-> ⟨egg⟩ (describe the function signature in https://github.com/mockingbirdnest/Principia/blob/master/serialization/journal.proto, and write an implementation in the appropriate ksp_plugin/interface_meow.cpp. You can then call it from the C#)
<queqiao-> ⟨sichelgaita⟩ ⟪Al₂Me₆⟫ (Might want to mention in the change […] ⮪ Done.
<queqiao-> ⟨sichelgaita⟩ 🇳🇱 has the first download.
<queqiao-> ⟨lamont⟩ i'm sort of thinking i want something neighboring this:
<queqiao-> ⟨egg⟩ yeah, but without the plotting.
<queqiao-> ⟨lamont⟩ only principia__FlightPlanGetManoeuvreTerminalInertialVelocity + Position
<queqiao-> ⟨lamont⟩ right