raptop changed the topic of #principia to: READ THE FAQ: http://goo.gl/gMZF9H; The current version is Galileo. We currently target 1.5.1, 1.6.1, 1.7.x, 1.8.1, and 1.9.1. <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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<discord-_> A​nomaly. — @Stonesmile
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<_whitenotifier-d13c> [Principia] pleroy opened pull request #2622: Conversion of a polynomial to a higher degree - https://git.io/JJUEd
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<discord-_> D​amien. — @Butcher mainly target body centered sun aligned
<discord-_> D​amien. — Then target body centered inertial to tidy it up
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<_whitenotifier-d13c> [Principia] eggrobin labeled pull request #2622: Conversion of a polynomial to a higher degree - https://git.io/JJUEd
<discord-_> e​gg. — and target body surface if you plan to impact or land immediately on arrival
<discord-_> B​utcher. — I don't.
<discord-_> B​utcher. — Also is launching into roughly the plane of the moon still a reasonable proxy for the eclipitic?
<discord-_> e​gg. — kind of (though you might be 5° off), but there is the ecliptic navball
<discord-_> B​utcher. — My launch site is 34.6 degrees north, I;m never going to hit it exactly.
<discord-_> e​gg. — (ECSA is Earth-centred ecliptic, so its reference plane is the ecliptic)
<discord-_> e​gg. — (I should really rename that frame)
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<discord-_> S​tonesmile. — When transfering to another planet, is it best to correct inclination between the planet and the vessel during the ejection burn from earth or as a correction once away from earth?
<discord-_> D​amien. — you can only match inclination with the target if you eject when earth is at the an/dn of the target orbit
<discord-_> D​amien. — that's rarely the case
<discord-_> D​amien. — your inclination around earth is irrelevant on an interplanetary scale
<discord-_> D​amien. — so yeah, correction at the an/dn is the best way
<discord-_> S​tonesmile. — Well that is obvious in hindsight...
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<discord-_> M​yshiko. — @Stonesmile the usual recommendation on how to deal with inclination on interplanetary launches - take off at dusk-dawn, go polar, follow the terminator (line between light and darkness). And then find departure burn on that orbit.
<discord-_> M​yshiko. — @Stonesmile the usual recommendation on how to deal with inclination on interplanetary launches from high inclination sites - take off at dusk-dawn, go polar, follow the terminator (line between light and darkness). And then find departure burn on that orbit. (edited)
<_whitenotifier-d13c> [Principia] pleroy closed pull request #2622: Conversion of a polynomial to a higher degree - https://git.io/JJUEd
<_whitenotifier-d13c> [Principia] pleroy pushed 2 commits to master [+0/-0/±6] https://git.io/JJTUn
<_whitenotifier-d13c> [Principia] pleroy 13be47d - Conversion of a polynomial to a higher degree.
<_whitenotifier-d13c> [Principia] pleroy 57a213f - Merge pull request #2622 from pleroy/PolynomialConversion Conversion of a polynomial to a higher degree
<_whitenotifier-d13c> [Principia] pleroy opened pull request #2623: Primitive of a Poisson series - https://git.io/JJTUP
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<_whitenotifier-d13c> [Principia] eggrobin labeled pull request #2623: Primitive of a Poisson series - https://git.io/JJTUP
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<_whitenotifier-d13c> [Principia] pleroy commented on pull request #2623: Primitive of a Poisson series - https://git.io/JJTTo
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<_whitenotifier-d13c> [Principia] pleroy synchronize pull request #2623: Primitive of a Poisson series - https://git.io/JJTUP
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<discord-_> C​onventia. — The one thing I need to get better at is planning interplanetary launches/burns.
<discord-_> B​utcher. — KER transfer time is remarkably good.
<discord-_> C​onventia. — Unfortunately, knowing the right time is only part of the battle.
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<_whitenotifier-d13c> [Principia] pleroy closed pull request #2623: Primitive of a Poisson series - https://git.io/JJTUP
<_whitenotifier-d13c> [Principia] pleroy pushed 11 commits to master [+0/-0/±24] https://git.io/JJTI3
<_whitenotifier-d13c> [Principia] pleroy 2dfb881 - Primitive of a Poisson series.
<_whitenotifier-d13c> [Principia] pleroy 38ad9e5 - Merge branch 'master' into PoissonPrimitive
<_whitenotifier-d13c> [Principia] pleroy ecdf7b9 - Polynomial conversion.
<_whitenotifier-d13c> [Principia] ... and 8 more commits.
<discord-_> M​yshiko. — Well, get in to the right parking orbit, and take the planning time.
<discord-_> M​yshiko. — If the launch date / time is order-of magnitude correct, there will be a burn solution
<discord-_> C​onventia. — That's also not what I meant.
<discord-_> C​onventia. — I often focus on getting close to the planet after the initial burn, which usually results in the craft going too fast to capture at the destination.
<discord-_> C​onventia. — Flybys aren't that hard.
<discord-_> M​yshiko. — You want free capture? Or aero-capture? The propulsive capture is usually a bloody affair (a lot of delta v expended).
<discord-_> M​yshiko. — (I have no experience with free capture on planetary scale)
<discord-_> C​onventia. — I've never done anything with principia other than propulsive. I'm not really asking for advice or help. It's just a learning experience for me that I commented on.
<discord-_> M​yshiko. — Acknowledging
<discord-_> C​onventia. — It seems like the impact of inclinations with principia is higher when going interplanetary.
<discord-_> M​yshiko. — Depends on what type of parking orbit one got into.
<discord-_> C​onventia. — I mean, inclinations of the planets. Inclination of the parking orbit seems mostly inconsequential, given sufficient dv.
<discord-_> C​onventia. — Most of my transfer stages have 500-1000 m/s spare dv.
<discord-_> M​yshiko. — I see
<discord-_> M​yshiko. — Well, looks like some transfer stage margins can be redirected to arrival burn
<discord-_> M​yshiko. — Especially if you have multi-ignition engines for arrival burns, then you can cut departure margins to effectively zero.
<discord-_> M​yshiko. — At the cost of one more ignition.
<discord-_> M​yshiko. — Aka, make the arrival stage burn a tiny bit on the departure if departure needs those last few 100 m/s delay v
<discord-_> M​yshiko. — Aka, make the arrival stage burn a tiny bit on the departure if departure needs those last few 100 m/s delta v. (edited)
<discord-_> M​yshiko. — Also, mind the side of the planet you are arriving to. Some sides are a bit better for making an orbit.
<discord-_> s​cimas. — Not to be nitpicky, but most of the orbital mechanics become inconsequential given sufficient dv 🤪
<discord-_> e​gg. — Tintin’s rocket ftw
<discord-_> L​uci. — is 86 degrees around the moon one of the mystical "frozen orbits" in principia?
<discord-_> e​gg. — they are neither mystical nor, as is commonly believed for some reason, discrete; instead for each inclination and semimajor axis there is an eccentricity that is stable
<discord-_> e​gg. — (sometimes that eccentricity is so high as to make the orbit nonexistent obviously, but still, you have continuous families of stable orbits)
<discord-_> S​tonesmile. — If I'm not mistaken the 86 deg orbit is stable for low circular orbits, under 100 km
<_whitenotifier-d13c> [Principia] pleroy opened pull request #2624: Change Poisson series to take Instant, not Time - https://git.io/JJTmL
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<_whitenotifier-d13c> [Principia] pleroy edited pull request #2624: Change Poisson series to take Instant, not Time - https://git.io/JJTmL
<_whitenotifier-d13c> [Principia] eggrobin reviewed pull request #2624 commit - https://git.io/JJTmA
<_whitenotifier-d13c> [Principia] eggrobin labeled pull request #2624: Change Poisson series to take Instant, not Time - https://git.io/JJTmL
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<_whitenotifier-d13c> [Principia] pleroy synchronize pull request #2624: Change Poisson series to take Instant, not Time - https://git.io/JJTmL
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<discord-_> e​gg. — ah yes, if you restrict to circular you go from a 1-parameter family at fixed semimajor axis to a discrete set
<discord-_> e​gg. — As usual, I recommend reading Martín Lara, 2011, *Design of long-lifetime lunar orbits: A hybrid approach* https://ars.els-cdn.com/content/image/1-s2.0-S009457651100066X-gr2.jpg
<discord-_> B​utcher. — My lunar orbiter is still alive, nearing 700 days.
<discord-_> M​yshiko. — nice
<_whitenotifier-d13c> [Principia] eggrobin opened pull request #2625: Mean apsides and minimal distance - https://git.io/JJTGn
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<discord-_> B​utcher. — Sounds good.
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