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…
<discord-> e​gg. — Yeah; unfortunately there is no better way to see that right now; eventually I want to add the mean solar time of the nodes (and their drift).
<discord-> K​obymaru. — I think 1 or 2 more digits might help
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<discord-> e​gg. — they possibly might, but honestly it’s just the wrong tool for the job ; it cannot tell you how many of those digits actually matter over the mission duration, and in what way
<discord-> e​gg. — instead you should get something that tells you that the mean solar time of the ascending node is, e.g., 22:30±00:05, and then you know how close to sun-synchronicity you are for the length of your mission
<discord-> e​gg. — (but that requires analysing the orbit of the earth, which requires reworking the analyser a bit, probably with a proper quadrature (or just an integrator))
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<discord-> Z​eusbeer. — How high can you get that time?
<discord-> Z​eusbeer. — Is it possible to create a surface reference frame with a stock conics / on rails system?
<discord-> Z​eusbeer. — Is it possible to create a surface reference frame with a stock conics / on rails type system? (edited)
<discord-> Z​eusbeer. — not as a mod, but just if it's generally possible at all
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<discord-> s​ichelgaita. — It may just be my paranoia, but this sounds like a safety nightmare. I wouldn't want a kitchen where "pulling the plug" has no effect, especially if there are kids around.
<discord-> B​utcher. — Yes.
<discord-> B​utcher. — Presumably you can just lift it up
<discord-> Z​eusbeer. — cool
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<discord-> e​gg. — I think the trajectories mod has that
<discord-> A​shnoom. — This. Depending on your budget you can have a single spot or many and just moving the device is fine enough. Heck of you move it a few CMs is already enough to stop power transfer :-)
<discord-> A​shnoom. — @sicou2 This. Depending on your budget you can have a single spot or many and just moving the device is fine enough. Heck of you move it a few CMs is already enough to stop power transfer :-) (edited)
<discord-> A​shnoom. — @sichelgaita This. Depending on your budget you can have a single spot or many and just moving the device is fine enough. Heck of you move it a few CMs is already enough to stop power transfer :-) (edited)
<discord-> A​shnoom. — @sichelgaita This. Depending on your budget you can have a single spot or many and just moving the device is fine enough. Heck of you move it a few CMs is already enough to stop power transfer :-) (sorry, mentioned wrong user before, sorry for that ping) (edited)
<discord-> A​shnoom. — I could almost argue it is more safe as you won't need any visible/reachable power outlets
<discord-> B​utcher. — Can't drop the cord into the sink then plug it in and bang...
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<discord-> K​obymaru. — Is there a way to read out the orbital parameters of celestials?
<discord-> S​tonesmile. — No, not at the moment AFAIK, but they are very accurate compared to real life, so if you can find that data, then you are good to go
<discord-> K​obymaru. — where would I find that data?
<discord-> S​tonesmile. — Actually no idea 😅
<discord-> s​cimas. — JPL Horizons system. Search for those words in this chat and you will find enough info to get started.
<discord-> K​obymaru. — thanks
<discord-> K​obymaru. — I'm still trying to wrap my head around coordinate systems and orbital parameters...
<discord-> K​obymaru. — Why does MechJeb say my LAN is 44°, and Principia Orbit Analyzer say it's 153° ?
<discord-> K​obymaru. — All other parameters match up reasonably well
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<discord-> l​eudaimon. — Because youe LAN precesses, for most orbits quite fast, and the orbit analyser gives you the average, which won't be very useful if it's +- 200°along the time you asked it to analyse. If you put it down to around one orbit, both should roughly agree
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<discord-> K​obymaru. — Hmm, that's not it. a) It's a synchronous orbit with a nodal precession of 0.98°/d, so over the default of 7 days it should only precess by at most 7°. Second, I reduced the Analysis duration to one orbit, and it didn't change much.
<discord-> K​obymaru. — With the current craft, MJ/Stock LAN is 41°, Principia Orbit Analyzer LAN is 131°.
<discord-> K​obymaru. — Seems like Principia has a different reference direction
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<discord-> l​pg. — reference frames? LAN of orbit around earth vs LAN of orbit around sun?
<discord-> K​obymaru. — Exactly. Good Question, because I don't know. I'm orbiting earth currently.
<discord-> K​obymaru. — Reference frame is Earth-Cenetered Inertial, but the LAN doesn'T change if I switch those reference frames
<discord-> l​pg. — taking a look here, orbit analyzer is pretty explicit ("orbit of X with respect to Earth"), so that's not it
<discord-> l​pg. — And I see the same, MJ/stock/hyperedit show one LAN, analyzer another. (0 vs 80±10 in my case)
<discord-> K​obymaru. — exactly
<discord-> K​obymaru. — It's not a big deal on one hand. On the other hand, it kinda throws a wrench into rationally calculating parking orbits in advance, or using real-world values for interplanetary launches
<discord-> K​obymaru. — (also it confused the hell out of me, because this stuff is confusing enough without discrepancies)
<discord-> l​pg. — trying around the sun, I get 0 vs 90±0.000...something. So seems to be 90 degrees off
<discord-> K​obymaru. — now that you mention it, it's always almost exactly 90° off
<discord-> l​pg. — you had 41 vs 131 = 90 off, my 80±10 could also be 90
<discord-> K​obymaru. — in the screenshot it's 93.5, but with +- 3.5 variation
<discord-> K​obymaru. — and the shorter the testing length is, the closer it gets to 90°
<discord-> l​pg. — I will not venture a guess as to which is "correct"
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<discord-> e​gg. — yes I believe we have different axis conventions from KSP
<discord-> e​gg. — (but our axis conventions should be consistent with real-life ones though)
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<discord-> K​obymaru. — Principia-Assisted Precision Landing
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<discord-> K​obymaru. — it's funny how Principia makes the game so much harder, but with some aspects it makes it easier
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