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-> ⟨Darthdog⟩ Have you considered a distant retrograde orbit?
<queqiao-> ⟨Darthdog⟩ I don’t know how stable those are but they seem pretty sick
<queqiao-> ⟨the rocket science kid⟩ those would go slowly around the moon if I understand correctly, which means no comms for the far side
<paculino> That's why you need more than one commsat generally
<queqiao-> ⟨the rocket science kid⟩ and using the Chinese way of sticking a single probe in a halo orbit at L2 means constant station keeping (tedious)
<paculino> I think using three or four is your best bet
<queqiao-> ⟨the rocket science kid⟩ How about just two probes, one in a Lissajous orbit at L2 and the other at L4 or L5 for when the L2 probe passes behind the moon?
<queqiao-> ⟨Darthdog⟩ A satellite at L4 or L5 couldn’t provide full far side coverage, and you can offset two DROs so that at least one always has visual of earth
<queqiao-> ⟨Darthdog⟩ Could be good, but me personally I would not want to correct every month
<queqiao-> ⟨the rocket science kid⟩ Halo orbit needs correction every month. Lissajous orbit is supposed to be better?
<queqiao-> ⟨the rocket science kid⟩ * better
<queqiao-> ⟨Darthdog⟩ Oooohhhh
<queqiao-> ⟨the rocket science kid⟩ I would imagine maybe correction every 3-6 months
<queqiao-> ⟨the rocket science kid⟩ That’s tolerable to me, but 1 month halo orbit is too frequent
<queqiao-> ⟨the rocket science kid⟩ +with
<queqiao-> ⟨Darthdog⟩ Do you ever have to correct a DRO orbit?
<queqiao-> ⟨Darthdog⟩ But I guess you could do a frozen orbit anyways 🤔
<queqiao-> ⟨night_beast⟩ A halo orbit I understand, I don't really understand a Lissajous orbit. that's the figure 8 pattern through the L2 point instead of circling around it right? So like you start in one corner and aim directly across to the other, and that causes it to figure 8 right?
<queqiao-> ⟨night_beast⟩ Like I look at graphs like this and my head hurts
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<queqiao-> ⟨night_beast⟩ ⟪the rocket science kid⟫ How about just two probes, one in a […] ⮪ So, I just did the math on the L4/L5 plan for when the L2 sat is behind the moon. Unfortunately that's just not viable. Due to the way the LaGrange points work, the Earth, Moon, and L4 (or L5) point are all equal-distant from each other, meaning you would have ~400Mm between the Moon & L4/L5, and would need a DSN level power signal to reach it.
<queqiao-> ⟨night_beast⟩ So looks like our options are:
<queqiao-> B. 1 sat at L2 in a halo orbit that needs to be adjusted every month
<queqiao-> A. 3 sat comm network in a frozen orbit (27°, 50°, 76°, or 86° inclination)
<queqiao-> C. 1 sat at L2 in a random Lissajous orbit that will need to be adjusted every 6(ish) months, but will have periodic blackouts when it's behind the moon
<queqiao-> Am I missing anything?
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<queqiao-> ⟨vickjhhh⟩ Has anyone figure out how to install Principia on a Mac M1 machine? I've installed (i think) the correct c+ via Xcode - but I still get the error that C+ is not installed. Any help would be appreciated.
<queqiao-> ⟨clayel⟩ is the reason why these trajectories are different due to the earth's rotation?
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<queqiao-> ⟨the rocket science kid⟩ ⟪night_beast⟫ So looks like our options are: A. 3 sat […] ⮪ how about two sats in a lissajous orbit, averaging a correction every three months, which will never lose comms (probably)