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->
⟨Kerbinator⟩ ⟪siimav⟫ 4 cores and decent single thread […] ⮪ how much cores/threads can principia use at most
<queqiao->
⟨Kerbinator⟩ btw Principia is at least not laggy in flight view. Spagetti is 100% responsible.
<queqiao->
⟨Kerbinator⟩ btw Principia is at least not laggy in flight view. Spagetti is 100% responsible
<queqiao->
(especially something like 6.4e4 steps & ECEF)
<queqiao->
⟨pEdro⟩ ⟪Kerbinator⟫ how much cores/threads can principia […] ⮪ as many as you have vessels,
<queqiao->
⟨Shturman⟩ Hey how do I calculate the heading I need to launch in to get to a specific lan?
<queqiao->
⟨pEdro⟩ you dont ?
<queqiao->
⟨pEdro⟩ i think you misunderstand what LAN is
<queqiao->
⟨Shturman⟩ Lan is longitude of ascending node right?
<raptop>
I mean, *technically* I guess you can vary both your LAN and inclination depending on launch heading
<queqiao->
⟨Shturman⟩ I'm just trying to find out how to figure what Lan I want and what heading I need to launch in to get there
<queqiao->
⟨pEdro⟩ LAN is a matter of launch timing
<raptop>
I mean, I'd expect that you'd want to go at this in a different direction: heading for inclination, launch time for LAN
<queqiao->
⟨Shturman⟩ Ok gotcha so how do I figure out heading to inclination?
<queqiao->
⟨pEdro⟩ what LAN you want is usually the one TWP or one of the lunar launch scripts spits out
<queqiao->
⟨Shturman⟩ Okay it's saying a target LAN of 257.67 and a target inclination of 21.68 so now that I know that how do I find out what to set my heading to?
<queqiao->
⟨Quadrupole⟩ Where is your launch site?
<queqiao->
⟨Shturman⟩ Cape Canaveral
<queqiao->
⟨Quadrupole⟩ You cannot launch into a lower inclination
<queqiao->
⟨Shturman⟩ What do you mean exactly?
<queqiao->
⟨pEdro⟩ you just cant
<raptop>
Well, you can if you hate yourself enough
<queqiao->
⟨pEdro⟩ * cant, takes incredible amounts of ∆V
<raptop>
Yeah, doglegs are contraindicated
<raptop>
Have you considered Kourou?
<queqiao->
⟨pEdro⟩ i think hes trying to launch to the moon
<queqiao->
⟨pEdro⟩ in which case, first pinned message in #script-automation
<queqiao->
⟨Shturman⟩ When you say I can't launch into a lower inclination you mean I can't launch into a lower inclination than cape canaveral right?
<queqiao->
⟨pEdro⟩ yes
<raptop>
yep
<queqiao->
⟨Quadrupole⟩ Yes. Lower inclination than Cape's latitude (28.3) is impossible
<queqiao->
⟨pEdro⟩ you cannot launch to a inclination significantly below your launch site latitude
<queqiao->
⟨Quadrupole⟩ +(without a crazy dogleg)
_whitelogger has joined #principia
<queqiao->
⟨rsparkyc⟩ however, if you're trying to go to a really high orbit, it's fairly cheap to do inclination changes at your AP, just try to get your AP aligned with you DN
<queqiao->
⟨sichelgaita⟩ ⟪Zeusbeer⟫ torques on the vehicle caused by the […] ⮪ That's an intriguing idea. The naive approach would be to apply gravity to each part individually (as opposed to: the entire vessel), but that would probably be prohibitively expensive. On the other hand, it should be possible to compute formally the torque exerted on an ellipsoid having the same inertia tensor as the vessel, and feed that into the solver for...
<queqiao->
⟨Zeusbeer⟩ which makes it a bit less expensive
<queqiao->
⟨Zeusbeer⟩ if you need access to it let me know
<raptop>
(something something good bird website)
<queqiao->
⟨Zeusbeer⟩ I stumbled across it while working on an assignment for uni
<queqiao->
⟨Zeusbeer⟩ * uni, and thought maybe it could be interesting for principia
<queqiao->
⟨sichelgaita⟩ Thanks for the pointer, the good bird was good, and indeed the appendix A seems spot on. (No guarantee that we'll ever do something with this, your mileage may vary and void your guarantee, yada yada.)
<queqiao->
⟨Zeusbeer⟩ yes it was just a suggestion
<queqiao->
⟨Zeusbeer⟩ but interesting at least
<paculino>
How strong would the torques be in typical missions?
<queqiao->
⟨Zeusbeer⟩ It would strongly depend on the size of the spacecraft
<queqiao->
⟨Zeusbeer⟩ I would say in the order of 10^-5 Nm for large spacecraft and 10^-7 Nm for smaller spacecraft
<queqiao->
⟨Zeusbeer⟩ it also depends on the orientation and mass distribution
<queqiao->
⟨Zeusbeer⟩ but it builds up over time because it is always there