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…
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<queqiao->
⟨Overloader⟩ Is there any trick on getting really precise nodes?
<queqiao->
⟨Overloader⟩ * precise maneuvers?
<queqiao->
⟨Quadrupole⟩ No, and there was an obsessed one who received 🥚 🌩️
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<queqiao->
⟨Butcher⟩ Bearing in mind most engines are ±0.5% or worse, its not really worth it, unless you're using rcs of course
<queqiao->
⟨egg⟩ A point has been made that it is useful to have arbitrary precision in the initial state to look for plausible trajectories (to which you then guide yourself), in particular sequences of gravity assists.
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<queqiao->
⟨Overloader⟩ yeah, but i kinda suck at for example getting apoapsis and periapsis close to erach other without iterating the planning process like 20 times
<queqiao->
⟨Butcher⟩ Do you need to get them close?
<queqiao->
⟨Overloader⟩ well, when I want to have a circular orbit yes
<queqiao->
⟨Overloader⟩ for example geostationary
<queqiao->
⟨egg⟩ There is no such thing as a perfectly circular orbit (and indeed eventually you’ll get more than two apsides per revolution and things will get weird).
<queqiao->
Some applications may require a circular enough orbit. What your orbit is for is what dictates how circular it needs to be.
<queqiao->
⟨egg⟩ (likewise no such thing as a perfectly geostationary orbit, etc.)
<queqiao->
⟨Butcher⟩ It's usually more useful to look at geo from the ecef frame and modify the manoeuvre to give the required ground track.
<queqiao->
⟨egg⟩ (also, you essentially don’t have a reason to be in GEO at the moment, but I’m working on it)
<queqiao->
⟨Butcher⟩ I use it for comms for Leo.
<queqiao->
⟨egg⟩ ⟪Butcher⟫ I use it for comms for Leo. ⮪ so something like TDRS? I guess synchronicity makes some sense there, because then you can fill some gaps at fixed longitudes; but you have a lot of leeway on inclination. And a non-synchronous constellation would work just as well as long as it covers the whole earth in low latitudes.
<queqiao->
⟨lpg⟩ the reason to be in GEO at the moment is that we get money to be there
<queqiao->
⟨egg⟩ ⟪lpg⟫ the reason to be in GEO at the moment […] ⮪ well, yes, but then the question of « why this orbit, and therefore what are the tolerances » doesn’t have a good answer :-p
<queqiao->
⟨lpg⟩ the other reason is that the noodles are satisfying
<queqiao->
⟨Butcher⟩ ⟪egg⟫ so something like TDRS? I guess […] ⮪ Yes. Currently just one sat, but o normally do an East and West sat
<queqiao->
⟨Butcher⟩ Coverage is effectively continuous at typically orbit altitude.
<queqiao->
⟨egg⟩ ⟪lpg⟫ the other reason is that the noodles […] ⮪ ah, yes. There the tolerance is easy to define: tune the noodles to taste.
<queqiao->
⟨expanders are superior⟩ How can I see the orbital period for an orbit that’s created by a maneuver?
<queqiao->
⟨rnlahaye⟩ There is an orbit analysis button in the maneuver window