raptop changed the topic of #principia to: READ THE FAQ: http://goo.gl/gMZF9H; The current version is Fréchet. We currently target 1.5.1, 1.6.1, and 1.7.x. <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
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Pteropodidae. — Hmmm
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Pteropodidae. — I wonder how hard it would be to try to implement that as a mod
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Pteropodidae. — Initial orbit ~340km, instantaneous impulse in the tangent direction
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Pteropodidae. — Apply impulse ∆v_1 at t_0, integrate forwards for 160 days, discard those that do not get closer than 10^4km to the Moon
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Pteropodidae. — Then apply an impulse at the closest point to the moon in the 160-day trajectory so that your periselene is 262km, then apply a third impulse to circularize the orbit
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[Principia] pleroy commented on pull request #2544: Add a new class, ExpressIn, to help with type erasure of quantities in Mathematica output - https://git.io/JftoB
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[Principia] pleroy synchronize pull request #2544: Add a new class, ExpressIn, to help with type erasure of quantities in Mathematica output - https://git.io/JftCG
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[Principia] pleroy synchronize pull request #2544: Add a new class, ExpressIn, to help with type erasure of quantities in Mathematica output - https://git.io/JftCG
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[Principia] pleroy synchronize pull request #2544: Add a new class, ExpressIn, to help with type erasure of quantities in Mathematica output - https://git.io/JftCG
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[Principia] eggrobin labeled pull request #2544: Add a new class, ExpressIn, to help with type erasure of quantities in Mathematica output - https://git.io/JftCG
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[Principia] pleroy pushed 16 commits to master [+0/-0/±43] https://git.io/Jfty7
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[Principia] pleroy 6801494 - Experiment with a new approach for ExpressIn.
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[Principia] pleroy 7c99138 - A fully working version with dynamic checks.
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[Principia] pleroy f6e10c3 - A statically typed attempt.
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[Principia] ... and 13 more commits.
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[Principia] pleroy closed pull request #2544: Add a new class, ExpressIn, to help with type erasure of quantities in Mathematica output - https://git.io/JftCG
<discord->
moar ssto. — > RO parts should be fine (not just that, they are probably required if you want to sanely deal with the fairly large planets)
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moar ssto. — @egg If starting from d, stock parts will still outperform ro parts due to super op rapier+nerv combo.
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moar ssto. — d only has a low orbit speed of 4800m/s (or 4600, I forgot exactly.
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moar ssto. — > RO parts should be fine (not just that, they are probably required if you want to sanely deal with the fairly large planets)
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moar ssto. — @egg If starting from d, stock parts will still perform fairly well, especially using the very op rapier+nerv classical combo. (edited)
<discord->
moar ssto. — > RO parts should be fine (not just that, they are probably required if you want to sanely deal with the fairly large planets)
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moar ssto. — @egg If starting from d, stock parts will still perform well due to super op rapier+nerv combo. (edited)
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moar ssto. — Also d has a very forgiving gravity of less than 0.5g.
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egg. — yeah but I think the starting body is TRAPPIST-1d
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egg. — yeah but I think the starting body is TRAPPIST-1e (edited)
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moar ssto. — Oh, than that's different, though should still be playable with stock parts, e is a bit easier than Earth, the real monster is f, which is an oxy-venus.
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[Principia] pleroy closed pull request #2546: Fix a number of TODOs in ToMathematica and friends - https://git.io/JftSE
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[Principia] pleroy pushed 3 commits to master [+0/-0/±8] https://git.io/Jft7m
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[Principia] pleroy a467857 - Fix a number of TODOs in ToMathematica and friends.
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[Principia] pleroy 7420a9b - After egg's review.
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[Principia] pleroy c65fa7b - Merge pull request #2546 from pleroy/MathematicaImprovements Fix a number of TODOs in ToMathematica and friends
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Acer_Saccharum. — I played it with stock parts and SMURFF
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moar ssto. — By Trappist-1, do you mean the Slippist-1 mod or REX mod?
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Acer_Saccharum. — The one linked in the principia wiki
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Acer_Saccharum. — Slippist I think
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moar ssto. — Oh, then planets should be very different from ones in REX. I have only played a bit REX, basically just hyper edited some sstos to the surface and see if they can make it back to orbit.
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egg. — we should make our TRAPPIST-1 patch work for rex too I suppose
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Acer_Saccharum. — REX looks a lot better, and the sun isn't unrealistically orange
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egg. — bear in mind that unless you use our TRAPPIST-1 patch, the orbits (and in particular the resonance) is going to be very very wrong
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egg. — bear in mind that unless you use our TRAPPIST-1 patch, the orbits (and in particular the resonance) aregoing to be very very wrong (edited)
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egg. — bear in mind that unless you use our TRAPPIST-1 patch, the orbits (and in particular the resonance) are g/oing to be very very wrong (edited)
<discord->
egg. — bear in mind that unless you use our TRAPPIST-1 patch, the orbits (and in particular the resonance) are going to be very very wrong (edited)
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moar ssto. — The REX Trappist planets look amazing.
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<discord-_>
egg. — hm, glancing at its config files, looks like REX does some :Final patching, which is not great for further modding
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egg. — also it is not clear it has a setting to make TRAPPIST-1 the home system
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[Principia] pleroy synchronize pull request #2547: An RAII object for Mathematica logging - https://git.io/Jft73
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[Principia] eggrobin labeled pull request #2547: An RAII object for Mathematica logging - https://git.io/Jft73
<discord-_>
egg. — huh you are still using Frobenius after all?
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<discord-_>
Falcon. — no
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Falcon. — i stayed on the current one
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egg. — That screenshot says Frobenius
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egg. — the latest one is Fubini
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egg. — I don’t know what you mean by current, but you should consider actually calling the releases by their names if you want anybody to understand what you are saying
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Falcon. — well you just released Fubini, i didnt know there was an update^^
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Falcon. — I only check for updates 2 or 3 times a month for the major mods i use
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egg. — You can tell there is an update because the UI is screaming it at you :-p
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egg. — just below the word « Principia »
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Falcon. — i dont look there, xD
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egg. — alternatively, you can look at the sky
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egg. — when you see a waxing crescent, you know that there recently was a release
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Acer_Saccharum. — I really do appreciate the release schedule
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egg. — 🌒
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Falcon. — pfft
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Falcon. — note to self btw
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Falcon. — use RCS for maneuvering around a low gravity body
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Falcon. — not the main engine
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Falcon. — :p
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Falcon. — its more like Rendezvous
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egg. — any but the most puny RCS will effectively be the main engine there :-p
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Falcon. — im trying to survey the surface of it
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Falcon. — by biome mapping
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Falcon. — and i have to be above 15 km for the sensor to work
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egg. — I wonder whether the orbit analyser can help
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Falcon. — but anything above 15 km tends to pull the spacecraft around and away
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egg. — (it is entirely possible that it will fall on its face on such a weakly bound orbit)
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egg. — (but I would be interested in knowing what it thinks)
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lpg. — can you go high enough that the scanner beam width covers the whole body?
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Falcon. — no
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egg. — yup, it fell on its face
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Falcon. — the SOI of Phobos is only about 35 km it seems
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egg. — yeah the analyser tells you Keplerian things and it does rely on some Keplerian assumptions in order to do that
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egg. — this does not play well with Phobos :D
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Falcon. — im eventually going to land this probe and see how well it sticks
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Falcon. — lol
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lpg. — it sticks so well it might stay balanced on the edge of a solar panel
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egg. — yeah I recall testing flying around Phobos when dealing with a Principia bug wherein we would incorrectly deal with the low points of the surface
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Falcon. — i imagine irl if astronauts go to phobos or some asteroid with gravity, they will likely just use MMUs or lead boots
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lpg. — lead boots doesn't sound like a great idea. kick too high too hard and you'll get pulled off the surface by your boot
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Ampersand. — Lead boots would just give you more inertia
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Ampersand. — You'd want some kind of grapple system
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lpg. — Just Cause: Phobos
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lpg. — subtitle _who needs a wingsuit_
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Ampersand. — And definitely a propulsion system
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Butcher. — > when you see a waxing crescent, you know that there recently was a release
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Butcher. — @egg how do you know if its waxing from a single observation? 🤔
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egg. — @Butcher because you see it in the evening, not in the morning
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Falcon. — Hey Egg, you showed me that video of the rotating object in space screw off of whatever it was on, then flip back 180 degrees, do a few spins, then go back right?
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Butcher. — Does that apply to all observers? I did not know that.
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Falcon. — I am experimenting with that spacecraft about that
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Falcon. — and instead of flipping 180
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Falcon. — it flips 90
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egg. — I am guessing that you are spinning it roughly 45° between axes, so you are seeing very wide precession (with variable rate) but not the full flip that you would get along the second axis
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egg. — but a written description is not exactly great to figure out how your thing spins
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egg. — try recording a video of the spinny thingamajig?
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Falcon. — i dont know how exactly to take a small video and send it here
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Falcon. — can you do it through discord?
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egg. — windows+G will allow you to record things I believe
<discord-_>
egg. — not sure they will be smol enough to go through discord, but maybe
<discord-_>
egg. — alternatively plonk it on YouTube as an unlisted video?
<discord-_>
egg. — (or some other site, I don’t care)
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TheRealWiwaxia. — I'm tempted to channel my inner RN right now...
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egg. — yeah I think it is what I said
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egg. — a good chunk of the way towards the middle axis, so you definitely notice the variable rate of precession, but not all the way so you flip notably less than half a turn
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egg. — this is seen from the point of view of the rotating body, and the curves show the angular momentum (which is fixed in space)
<discord-_>
egg. — so this (very handwavily) tells you how the pole of rotation moves across your body
<discord-_>
egg. — now, the angular momentum moves slower on those curves when it is closer to the direction of m2
<discord-_>
egg. — so if the blue curve were much closer to the green curve (which is the limiting case where it takes infinite time to flip), it would go closer to spinning around the middle axis (m2), and thus flip a longer way to -m2, and it would also stay longer in the vicinity of either
<discord-_>
egg. — if it were much further, it would remain close to -m1 and just wobble pretty uniformly about it (this is what you normally think of as precession: the small precession case, as opposed to the massive flopping around case)
<discord-_>
egg. — and in between, well, the situation is some sort of in-between