egg changed the topic of #principia to: READ THE FAQ: http://goo.gl/gMZF9H; The current version is Germain. We currently target 1.8.1, 1.9.1, 1.10.1, and 1.11.0. <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… | <egg> also 4e16 m * 2^-52 is uncomfortably large
<_whitenotifier-8975> [Principia] eggrobin closed issue #2867: Hard CTD when using the slider to change the tangent after modifying the initial time using its slider. - https://git.io/JtqLh
<_whitenotifier-8975> [Principia] eggrobin closed pull request #2874: Fix a bug or two with short orbit analyses - https://git.io/JtZtW
<_whitenotifier-8975> [Principia] eggrobin pushed 5 commits to master [+0/-0/±7] https://git.io/JtZEJ
<_whitenotifier-8975> [Principia] eggrobin 920d999 - A failing test.
<_whitenotifier-8975> [Principia] eggrobin dd666f2 - Allow flowing to the present.
<_whitenotifier-8975> [Principia] eggrobin 8da890a - get rid of an infinite loop
<_whitenotifier-8975> [Principia] ... and 2 more commits.
egg|laptop|egg has joined #principia
egg|laptop|egg__ has quit [Ping timeout: 189 seconds]
egg|laptop|egg_ has quit [Remote host closed the connection]
<discord-> c​ptmiche. — Is there a way to combat the oscillation (I think is the term) that occurs in spin stabilized rockets?
<discord-> (​experimentalshells?). — as in precession?
<discord-> (​experimentalshells?). — spin slower
egg|laptop|egg_ has joined #principia
<discord-> (​experimentalshells?). — * the author of this comment is not a physicist
egg|laptop|egg_ has quit [Remote host closed the connection]
<raptop> nutation?
<raptop> (I mean, nutation and precession are both possibilities)
egg|laptop|egg_ has joined #principia
<_whitenotifier-8975> [Principia] CindyRIng synchronize pull request #2857: localization for principia(have some problem) - https://git.io/JLjv0
egg|laptop|egg_ has quit [Remote host closed the connection]
<discord-> J​oeV. — @cptmiche , you can help your precession problem by using RCS Aid to check your balance for attitude and translation. And yes, spinning slower will help, but it will also be less stabilizing if your problem is that your main burn is torquing your spacecraft.
Mike` has quit [Ping timeout: 194 seconds]
Mike` has joined #principia
<discord-> c​ptmiche. — Hmmm
<discord-> c​ptmiche. — Yes, it is precession
<discord-> c​ptmiche. — After I spin up the rocket, and decouple the upper, it's nice and stable for about 10 seconds, after which the precession gets gradually worse and worse
<discord-> c​ptmiche. — Could it be that my rocket isn't stable before I spin it up?
<discord-> (​experimentalshells?). — hmm, screenshot?
<discord-> c​ptmiche. — <sorry, got absorbed into a khan academy video series on cosmology/astronomy>
<discord-> c​ptmiche. — I don't know how well I can get a screenshot of it, but I did add fins to my upper, and that seems to have fixed it.
<discord-> M​arsh. — It only needs to be good enough until the burn is over. I rarely get perfect spins
<discord-> c​ptmiche. — I'm guessing because it's a long, thin, pencil-like thing inside an upper atmosphere, spinning isn't enough, since I'm assuming drag can induce precession?
<discord-> P​aculino (ŝi/ri/she/they). — It will want to spin along the axis which provides the largest radius
<discord-> P​aculino (ŝi/ri/she/they). — Make it stubbier
egg|cell|egg has joined #principia
<discord-> c​ptmiche. — Will give it a go
<discord-> c​ptmiche. — Fins worked!
<discord-> c​ptmiche. — Also, I stripped out all the science and parachute equipment to make it shorter and lighter. That probably did a good bit to help with the length/width ratio
egg|laptop|egg_ has joined #principia
egg|laptop|egg has quit [Ping timeout: 189 seconds]
egg|laptop|egg has joined #principia
egg|laptop|egg has quit [Remote host closed the connection]
egg|laptop|egg has joined #principia
egg|laptop|egg has quit [Remote host closed the connection]
discord-_ has joined #principia
oeuf has joined #principia
discord- has quit [Ping timeout: 189 seconds]
egg has quit [Ping timeout: 189 seconds]
egg|cell|egg has quit [Ping timeout: 378 seconds]
egg|cell|egg has joined #principia
egg|cell|egg has quit [Ping timeout: 198 seconds]
egg|laptop|egg has joined #principia
<discord-_> c​ptmiche. — So apparently there is no stable lunarstationary orbit?
<discord-_> c​ptmiche. — If its stationary, it decays.
<discord-_> S​tonesmile. — What do you mean by stationary here?
<discord-_> c​ptmiche. — Geostationary, except the moon, not Earth.
<discord-_> S​tonesmile. — There are two such positions *kind off*
<discord-_> S​tonesmile. — They are the lagrange points
<discord-_> (​experimentalshells?). — and... they're not very stable
<discord-_> c​ptmiche. — I've learned about those, but aren't they technically not stationary?
<discord-_> c​ptmiche. — The Sun messes with them, right?
<discord-_> c​ptmiche. — Stationary relative to the moons surface*
<discord-_> S​tonesmile. — Stationary means over the same spot on the ground, so it's as close as you can get with the moon, as it's tidally locked with earth
<discord-_> (​experimentalshells?). — well, a lot of things mess with them
<discord-_> (​experimentalshells?). — mascons, Earth, Sun, everything really
<discord-_> D​amien (it/that). — @cptmiche seeing as the moon is tidally locked, anything stationary with the moon's surface would just be orbiting the earth
<discord-_> c​ptmiche. — I read about mascons!
<discord-_> D​amien (it/that). — technically an object orbiting in the same orbit, slightly ahead of the moon in its orbit would be (almost) stationary
<discord-_> l​pg. — _other_ than L points, a one-month orbit around the moon needs way too high an altitude to work
<discord-_> c​ptmiche. — Is there a tutorial out there on how to actually enter into an L point "orbit" with the Earth and Moon?
<discord-_> D​amien (it/that). — https://www.youtube.com/watch?v=LJbBPfXcNJg
<discord-_> c​ptmiche. — Thank ye!
<discord-_> s​cimas. — It's basically the same as going to the Moon. Imagine there is another body 60 degrees ahead (or behind) of Moon (for L4/5) and try to go to that body.
<discord-_> l​pg. — except don't count on the moon being there to help you "capture"
<discord-_> c​ptmiche. — By that you mean I need to kill off my velocity myself, right?
<discord-_> D​amien (it/that). — yeah you should just slide into it with hardly any excess velocity
<discord-_> c​ptmiche. — Gotcha
<discord-_> D​amien (it/that). — it's very subtle
<raptop> Anyway, in systems where a body is tidally locked, a (keplerian) stationary orbit is impossible. Fortunately, lagrange points (especially L4 and L5) exist
<discord-_> c​ptmiche. — That makes sense, since you will always have the pull from the other body, right?
<raptop> Sorta. Notably that a (keplerian) stationary orbit would have to be at an altitude that would put it outside of the tidally locked body's SOI
<discord-_> l​pg. — a matter of reference frame 🙂 from the earth's point of view, you need to _increase_ velocity, in what's essentially a normal circularization maneuver
<discord-_> B​utcher. — L4/5 are not completely stable ime.
<discord-_> B​utcher. — Though they're a lot better than L2.
egg|cell|egg has joined #principia
<discord-_> S​umguy. — Do we have Trojans in-game?
<discord-_> S​tonesmile. — Not deliberately I think, but an asteroid could spawn there if you are lucky 😅
<raptop> I want to say that baseline Principia does not, but it also doesn't include any asteroid smaller than Vesta
<discord-_> P​aculino (ŝi/ri/she/they). — So, happy ~~accidents~~ bugs?
* raptop feels bad for Pallas, Juno, and Iris
<discord-_> P​aculino (ŝi/ri/she/they). — \*Feels bad for Vesta and its incorrect prime meridian*
<raptop> On the other talon, Vesta has a mountain about as tall as Olympus Mons
oeuf has quit [Read error: Connection reset by peer]
discord-_ has quit [Read error: Connection reset by peer]
oeuf has joined #principia
discord- has joined #principia
egg|laptop|egg has quit [Remote host closed the connection]
egg|laptop|egg has joined #principia
<discord-> A​shnoom. — I wonder, would it be useful to add some kind of UI//selection to enable 'what lines to draw and what not?'
<discord-> A​shnoom. — I find the map view to start lagging _a lot_ when having to increase step rate while in LEO for instance.
<discord-> A​shnoom. — or when I was planning a maneouver around Mars, having a 300d flightplan draws _so_ _many_ _lines_ of moons and such. Where I normally have 20-30FPs, in such occasions the FPS drops to ~5. And sim speed drops to 50% and planning then becomes a PITA because everything responds sooo sllooowwww
<discord-> A​shnoom. — (not sure how feasible such a thing would be). If it is, then I'll create an issue on Github
<discord-> S​tonesmile. — If you change the tolerance instead, you might get better results
<discord-> A​shnoom. — the in the former I was planning a rendezvous 😉 Tolerance is importante!
<discord-> A​shnoom. — the former I was planning a rendezvous 😉 Tolerance is importante! (edited)
<discord-> A​shnoom. — But it was > 1d ahead for the initial node
<discord-> A​shnoom. — had to go for 400 steps, at 1mtr tolerance
<discord-> A​shnoom. — had to go for 4000 steps, at 1mtr tolerance (edited)
<discord-> A​shnoom. — (I think?)
<discord-> A​shnoom. — (I think?) (it feels that makes sense for a rendezvous) (edited)
<discord-> S​tonesmile. — The fact that you can't zoom in enough is probably the limiting factor here
<discord-> B​utcher. — It would be useful to be able to only draw a subset of the plan.
<discord-> B​utcher. — Jupiter and Saturn are terrible for planning because you have a couple of thousand days of history drawn for each moon.
<discord-> A​shnoom. — It the target's and current vessel
<discord-> A​shnoom. — Ot the target's and current vessel (edited)
<discord-> A​shnoom. — Or thehe target's and current vessel (edited)
<discord-> A​shnoom. — Or the target's and current vessel (edited)
egg|laptop|egg has quit [Remote host closed the connection]
egg|laptop|egg has joined #principia
egg|cell|egg has quit [Read error: Connection reset by peer]
egg|cell|egg has joined #principia
egg|laptop|egg_ has quit [Ping timeout: 198 seconds]