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->
⟨SpaceBoi⟩ if it is something ive done then im sorry its my first time using principia
<queqiao->
⟨SpaceBoi⟩ if it is a setting ive done wrong then im sorry its my first time using principia (edited)
<queqiao->
⟨Stonesmile⟩ The plotting frame is "heliocentric inertial", the sun's surface is fixed. (This is most likely not the frame you want to use)
<queqiao->
⟨Stonesmile⟩ Depends on what you want to see
<queqiao->
⟨Stonesmile⟩ The plotting frame is "heliocentric inertial", the sun is fixed. (This is most likely not the frame you want to use) (edited)
<queqiao->
⟨SpaceBoi⟩ so if i use it for earth orbits-landings and stuff like that i should use this?
<queqiao->
⟨SpaceBoi⟩ if its for transfers i use the gse?
<queqiao->
⟨Stonesmile⟩ For transfers to other planets, you probably want to use heliocentric first for rough planning, and then a reference frame of the target body
<queqiao->
⟨SpaceBoi⟩ a ok
<queqiao->
⟨SpaceBoi⟩ thanks
<queqiao->
⟨SpaceBoi⟩ well still got a long way to go before trasnfers so
<queqiao->
⟨SpaceBoi⟩ thanks for the help
<queqiao->
⟨Kobymaru⟩ i want coverage for the far side of the moon. Is there an orbit that rotates along with the moon, kind of like a sun-synchronous orbit?
<raptop>
So, uh, EML-2?
<raptop>
Probably more of a lissajous orbit around it than at the lagrange point proper
<queqiao->
⟨Paculino (ŝi/ri/she/they)⟩ Put a comm sat at L2 and another at L4 or L5; L2 orbits as quickly as the moon, and will remain above the far side (with proper station keeping)
<queqiao->
⟨lpg⟩ the boring but far easier answer is just put 2 or 3 satellites in medium moon orbit and call it a day
<queqiao->
⟨Quadrupole⟩ You do not need the L4/5 one if your L2 amplitude is large enough
<raptop>
That is indeed a boring answer
<queqiao->
⟨Quadrupole⟩ In fact due to the instability of L2 it is *hard* to get an obscured-L2 orbit.
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<queqiao->
⟨Damien⟩ an inclined EML2 orbit is perfect for far side comms
<queqiao->
⟨Damien⟩ at the cost of stationkeeping burns
<queqiao->
⟨Damien⟩ at the cost of stationkeeping burns (approx once per month) (edited)
<queqiao->
⟨Kobymaru⟩ thanks for the input
<queqiao->
⟨Kobymaru⟩ L4/L5 sound like a good idea but require beefy antennas on the moon spacecraft
<queqiao->
⟨Damien⟩ yeah but they can be occluded from the middle of the far side by terrain
<queqiao->
⟨Damien⟩ the easy way is just multiple relays in orbit of the moon
<queqiao->
⟨Kobymaru⟩ and I'd like to avoid stationkeeping if possible
<queqiao->
⟨Kobymaru⟩ Yeah I think I'll just have multiple
<queqiao->
⟨Damien⟩ yeah, 2 or 3 polar sats should do it
<queqiao->
⟨Kobymaru⟩ Maybe some frozen orbits like this: