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->
⟨.auer⟩ hello the principia masters!
<queqiao->
⟨.auer⟩ here i am again with another think to ask
<queqiao->
⟨.auer⟩ on this maneuver to jupiter I just can´t get the predicted results given by TWP
<queqiao->
⟨Quadrupole🇵🇸🇸🇾🇨🇺⟩ Is that a nuclear engine?
<queqiao->
⟨.auer⟩ yep
<queqiao->
⟨Quadrupole🇵🇸🇸🇾🇨🇺⟩ I now see why you get such a low TWR. Because of your long burn time, Oberth effect is not on your side and my prototype calculator shows you actually need 8332.6 m/s for that ejection.
<queqiao->
⟨Quadrupole🇵🇸🇸🇾🇨🇺⟩ Consider splitting your burn
<queqiao->
⟨.auer⟩ I can take some from the next stage
<queqiao->
⟨.auer⟩ your proptype calcultar?
<queqiao->
⟨.auer⟩ * prototype calculator?
<queqiao->
⟨Quadrupole🇵🇸🇸🇾🇨🇺⟩ It's a python script that integrates the continuous thrust equation of motion to find the gravity loss from low-twr burns
<queqiao->
⟨Quadrupole🇵🇸🇸🇾🇨🇺⟩ But still, I recommend you split the burn, as nuclear engines have a lot of ignitions.
<queqiao->
⟨Quadrupole🇵🇸🇸🇾🇨🇺⟩ I now see why you get such a low TWR. Because of your long burn time, Oberth effect is not on your side and my prototype calculator shows you actually need 8435.6 m/s for that ejection.
<queqiao->
⟨Quadrupole🇵🇸🇸🇾🇨🇺⟩ This is a plot from the calculator
<queqiao->
⟨.auer⟩ looks good, gonna try the splitting, thanks
<queqiao->
⟨.auer⟩ bottom line: TWP is not good for low TWR burns
<queqiao->
⟨rocketdyne_h1⟩ How does the Moon's orbital inclination precess over time, and how do I plan when to launch into what inclination to be coplanar to it?
<queqiao->
And the answer to the second part depends on the latitude of your launch site.
<queqiao->
⟨rocketdyne_h1⟩ ⟪Al₂Me₆⟫ Re. the first part, please refer to […] ⮪ My launch site is Kourou
<queqiao->
The second part of my question is more accurately "are there any tools that can help me plan launch windows"
<queqiao->
⟨rocketdyne_h1⟩ * windows for this"
<queqiao->
⟨Al₂Me₆⟩ If you're at Kourou MJ 'launch to target' plane should suffice?
<queqiao->
⟨rocketdyne_h1⟩ Not "to LAN", right?
<queqiao->
⟨Al₂Me₆⟩ * target plane'
<queqiao->
⟨Al₂Me₆⟩ ⟪rocketdyne_h1⟫ Not "to LAN", right? ⮪ That's insufficient for transferring; to target plane is to target LAN + to target inclination.
<queqiao->
⟨rocketdyne_h1⟩ I assume the way I can do this in PVG is to set to LAN, then input the inclination of the Moon at that moment?
<queqiao->
⟨rocketdyne_h1⟩ +orbital inclination as
<queqiao->
⟨Al₂Me₆⟩ Have you set the Moon as the target?
<queqiao->
⟨Al₂Me₆⟩ KSP features -> select target celestial
<queqiao->
⟨Al₂Me₆⟩ There should be a launch to target plane button, at least in old PVG
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<queqiao->
⟨jasman3764⟩ ⟪nazfib⟫ For a TLI burn, I'd use ECI as the […] ⮪ This worked! Thanks for the advice.
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<queqiao->
⟨egg⟩ ⟪jasman3764⟫ This worked! Thanks for the advice. ⮪ To clarify: The manœuvre frame is used to determine what « forward » means when you set up your manœuvre to burn « forward », so it is a fixed property of the manœuvre. Generally you want something sensible given the orbit you are in at the time of the burn.
<queqiao->
The plotting frame on the other hand is used for, well, plotting: you choose how you want to look at your flight plan, and you will generally switch between plotting frames all the time depending on what you want to know about your flight plan.
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<queqiao->
⟨Daedalus⟩ Hi, recently I am working on adding TNOs into Principia. When I was modifying the initial state cfg though, I found that most of the data are kind of outdated (especially the z and vz, which deviate a lot from JPL Horizon’s run). Just wanna confirm if it’s left like that on purpose or it’s actually outdated?
<queqiao->
PS. The settings I used for JPL are SSB, 1950/1/1/00:00-1950/1/1/00:01, steps = 60min. If there’s anything wrong with the settings please let me know.
<queqiao->
⟨Daedalus⟩ If the data is actually outdated, I would be glad to share my modified cfg to contribute to the development of this mod.
<queqiao->
⟨Daedalus⟩ * initial state cfg (which changed all the celestial bodies’ initial states)
<queqiao->
⟨Daedalus⟩ Hi, recently I am working on adding TNOs into Principia. When I was modifying the initial state cfg though, I found that most of the data are kind of outdated (especially the z and vz, which deviate a lot from JPL Horizon’s recent run). Just wanna confirm if it’s left like that on purpose or it’s actually outdated?
<queqiao->
PS. The settings I used for JPL are SSB, 1950/1/1/00:00-1950/1/1/00:01, steps = 60min. If there’s anything wrong with the settings please let me know.
<queqiao->
⟨Daedalus⟩ If the data is actually outdated, I would be glad to share my modified initial state cfg (which changed all of the celestial bodies) to contribute to the development of this mod.
<queqiao->
⟨Daedalus⟩ (I also added the initial state of Sedna)