raptop changed the topic of #principia to: READ THE FAQ: http://goo.gl/gMZF9H; The current version is Gateaux. We currently target 1.8.1, 1.9.1, and 1.10.1. <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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<mofh>
<raptop>
mofh!
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* discord-
experimentalshells. —
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<discord->
Butcher. — > we have been a few hours late on a couple of occasions
<discord->
Butcher. — @egg I trust the party responsible paid for that in blood?
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<discord->
Damien. — in yolk
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<UmbralRaptor>
adjusting the moon's orbit to match the release date was difficult
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<discord->
slome. — How right is the tranfer window planner with principia?
<discord->
slome. — Just wondering is it's usable to time a launch date within a couple of days or not.
<discord->
slome. — Since you have to launch to actually plan maneuvres.
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<discord->
Stonesmile. — It's 'usable', but I have noticed that the estimated date changes with time, due to perturbations. Test sim the mission in time to figure out the ideal date
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<discord->
slome. — As long as it's not more then a month or so difference it's fine for me, but having to test to just find the right month or year would seems a real pain to me.
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<discord->
Damien. — *ahem*
<discord->
Damien. — @egg seeing as your fancy orbit analyser does everything short of making a cup of tea now, any chance of it calculating transfer windows 'properly'?
<discord->
Damien. — or seeing as that's like the #1 question asked about principia, has it been considered and discarded as 'perhaps maybe one day but don't hold your breath'
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<discord->
slome. — Or is it possible to compare planetary phase angles at certain dates? that would
<discord->
slome. — Or is it possible to compare planetary phase angles at certain dates? that would do the job as well. (edited)
<discord->
Stonesmile. — It's not possible from within Principia, but if you are using RSS, teh real dates would be the correct ones
<discord->
Stonesmile. — It's not possible from within Principia, but if you are using RSS, the real dates would be the correct ones (edited)
<discord->
slome. — Yeah, but while it's easy to find historic launch dates, to problem is when you want to use a window that wasn't used historically.
<discord->
slome. — I have also found a file with upcomming windows, but no comprehensive chart going back to the 50's
<discord->
slome. — I have also found a file with upcoming windows, but no comprehensive chart going back to the 50's (edited)
<discord->
Stonesmile. — I would simply trust the window provided by TWP and design the mission to fit the date
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<discord->
siimav. — I heard that the good old *MJ adv transfer planner with test probe in LEO* works well enough with Principia
<discord->
slome. — I'll probably try that for now.
<discord->
Stonesmile. — It uses the same math, right?
<discord->
siimav. — Doubt it
<discord->
slome. — I was wondering how MJ tranfer planner works, with the planets not being on rails
<discord->
Stonesmile. — Aren't both Hohmann transfers using the patched conics?
<discord->
siimav. — Oh yeah, both use patched conics but at least MJ takes your vessel's actual inclination into account.
<discord->
Stonesmile. — The dv for the burn will be different, yeah, but are the dates going to differ much?
<discord->
siimav. — ¯\_(ツ)_/¯
<discord->
Stonesmile. — Either way, it's another data point to concider
<discord->
siimav. — Probably best to wait for lpg to chime in here as he's probably the most experienced person around here when it comes to Principia and all kinds of interplanetary trasnfers.
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<discord->
lpg. — > MJ adv transfer planner with test probe in LEO
<discord->
lpg. — is what I use. it hasn't failed me yet, even years in advance
<discord->
lpg. — A few others seem to be getting good results out of TOT
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<discord->
slome. — I'll probably just use that as well then.
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<discord->
smartdummies. — I use TWP and when the transfer date is roughly 100 days out I rerun it to get a closer estimate. I also try to add 10% to the injection burn. That is high as I always have leftover delta v but then that also leaves me a bit of leeway if I get engine failures
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<discord->
Sir Mortimer. — I always overdo my delta v. By a lot. But I have to because I’m terribly bad at launching rockets
<discord->
lpg. — some margin is definitely a good idea
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