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->
⟨egg⟩ the spacecraft normally orients itself nadir/along-track (the axes of the wings are in the plane of the orbit, which is inclined 74º.1), so the solar arrays are not perfectly facing the Sun (so the two wings on different axes allow you to have a decent amount of sun along the whole sunlit pass)
<queqiao->
⟨egg⟩ 10.4271/1999-01-2633 has more details but this is essentially the idea; 35° would have been optimal but then it messes with the antenna and induces drag torque
<queqiao->
⟨Sir Mortimer⟩ So those panels are fixed, and not tracking anything?
<queqiao->
⟨egg⟩ they track, but just like stock KSP panels, only on one axis
<queqiao->
⟨egg⟩ So the orbital plane looks like
<queqiao->
⟨egg⟩ ```
<queqiao->
⟨egg⟩ ☉
<queqiao->
⟨egg⟩ /S/C\
<queqiao->
⟨egg⟩ / \
<queqiao->
⟨egg⟩ ```
<queqiao->
⟨egg⟩ where the ☉ is (most of the time) somewhere out of plane, and the arrays rotate around the `/` and `\`
<queqiao->
⟨egg⟩ So the orbital plane looks like
<queqiao->
⟨egg⟩ ```
<queqiao->
⟨egg⟩ ☉→
<queqiao->
⟨egg⟩ /S/C\
<queqiao->
⟨egg⟩ / \
<queqiao->
⟨egg⟩ ```
<queqiao->
⟨egg⟩ where the ☉ is (most of the time) somewhere out of plane, and the arrays rotate around the `/` and `\` (edited)
<queqiao->
⟨Sir Mortimer⟩ The orbit is inclined {closeish to 90°} and going through nadir?
<queqiao->
⟨egg⟩ nadir means "down" so not sure what an orbit going through it would mean; the nadir direction is in the orbital plane, yes
<queqiao->
⟨egg⟩ So the orbital plane looks like
<queqiao->
⟨egg⟩ ```
<queqiao->
⟨egg⟩ ☉→
<queqiao->
⟨egg⟩ /S/C\
<queqiao->
⟨egg⟩ / 🜨 \
<queqiao->
⟨egg⟩ ```
<queqiao->
⟨egg⟩ where the ☉ is (most of the time) somewhere out of plane, and the arrays rotate around the `/` and `\` (edited)
<queqiao->
⟨Sir Mortimer⟩ Ah. I misunderstood, I thought the satellite was going through Nadir + Zenith (Sun directly above the satellite and then behind Earth) so tracking panels would have been pointless
<queqiao->
⟨Zeusbeer⟩ You can plan a mission where you flyby and then get close to earth to transmit data
<queqiao->
⟨egg⟩ Note that for a sat with a very low inclination you might do things differently, e.g. Megha-Tropiques has a more conventional look and flies with its wings either side of its ground track
<queqiao->
⟨egg⟩ this is the case e.g. for TOPEX/Poséidon, the axis of the wing is orthogonal to the direction of the Sun (and the instruments are nadir pointing)
<queqiao->
⟨egg⟩ there often also is a constraint of « keep the stuff on this side away from the Sun »
<queqiao->
⟨egg⟩ @DRVeyl attitude in timewarp for thermal management as well as antennæ and solar power! 🙃
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<queqiao->
⟨Nickname⟩ how to get to geostationary orbit?
<queqiao->
⟨Nickname⟩ how to get to geo-stationery orbit?
<queqiao->
⟨Nickname⟩ is it same as stock for principia?
<queqiao->
⟨Damien⟩ More or less
<queqiao->
⟨Nickname⟩ what?
<queqiao->
⟨Damien⟩ Yes, almost the same
<queqiao->
⟨Standecco⟩ you haven't actually asked anything meaningful
<queqiao->
⟨Standecco⟩ the Δv is basically the same
<queqiao->
⟨Standecco⟩ other things are not
<queqiao->
⟨Standecco⟩ ask a more specific thing
<queqiao->
⟨Damien⟩ You just might get some oscillation because of the earth being non spherical
<queqiao->
⟨Nickname⟩ oh ok i didnt know its my first time setting up a geo stationery orbit ever
<queqiao->
⟨Damien⟩ And the moon's effects
<queqiao->
⟨Damien⟩ But the process of getting there is the same
<queqiao->
⟨Standecco⟩ as in, it involves 2 burns of approximately the same magnitude
<queqiao->
⟨Standecco⟩ but of course, that's true for everything in principia vs stock
<queqiao->
⟨Damien⟩ *Googles 'low energy transfers to GSO'*
<queqiao->
⟨Nickname⟩ whats a resonant orbit and why its required?
<queqiao->
⟨egg⟩ where have you found this term and what do you mean by required? If you ask questions without context you are not going to get much in the way of useful answers
<queqiao->
⟨egg⟩ @Al2Me6 anything for 木星系及行星际飞越探测的多次借力飞行轨道设计研究?
<queqiao->
⟨Al2Me6⟩ I read it, didn’t see anything of interest
<queqiao->
⟨Al2Me6⟩ But I can drop a link
<queqiao->
⟨egg⟩ links are always good, but I guess this is going to be a long search
<queqiao->
⟨egg⟩ I think failing something smart we can just do a calque of English
<queqiao->
⟨egg⟩ the term for GSE is a calque
<queqiao->
⟨Al2Me6⟩ A lotta porkchop plots and C3 and whatnot, seems to be more concerned with launch capabilities and timeframes than anything else. http://www.doc88.com/p-5377818451478.html
<queqiao->
⟨egg⟩ And JSO/JSE (yes both terms exist) are very niche in English so I guess a calque of Jupiter-Sun-Orbit (the more modern term, Juno-era rather than the Galileo-era Jovicentric Solar Ecliptic) makes sense
<queqiao->
⟨Al2Me6⟩ Interesting that they use the term ‘借力高度’ for periapses of gravity assists instead of ex. 'venus periapsis'
<queqiao->
⟨Al2Me6⟩ A lotta porkchop plots and C3 and whatnot, seems to be more concerned with dV expenditure and timeframes than anything else. http://www.doc88.com/p-5377818451478.html (edited)
<queqiao->
⟨Al2Me6⟩ Just curious, is there a French term?
* raptop
would assume so, given JUICE
<queqiao->
⟨egg⟩ Haven't looked, I don't know it if there is one
* raptop
is confused by JSO & JSE -- Jupiter->Saturn->Oranus and Jupiter->Saturn->Earth?
<queqiao->
⟨Al2Me6⟩ raptop: un-abbreviated terms are in the same comment
<raptop>
apparently I'm bad at reading
<queqiao->
⟨egg⟩ Note that raptop does not know what you are replying to
<raptop>
No, in this case I was able to figure out that Al2Me6 meant Jupiter-Sun-Orbit and Jovicentric Solar Ecliptic
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<queqiao->
⟨egg⟩ (yes but I mean the reply function does not carry over the bridge)
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<raptop>
Yeah, anything that tried to more or less emulate it would be horribly spammy
<queqiao->
⟨Paculino (ŝi/ri/she/they)⟩ And the threads would be much much worse; thankfully they are blocked here
<queqiao->
⟨Al2Me6⟩ Stupid question time: I keep getting this error while attempting to build Principia:
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⟨egg⟩ the version should be spammed in a bunch of places in the build logs
<queqiao->
⟨Al2Me6⟩ Ah, thank you. The version number I did notice and had to add to one of the polynomial tests, just wasn't sure what to make of this error.
<queqiao->
⟨egg⟩ also, welcome to the the very small club of people who build their own Principia I guess, please collect your complimentary cat from @Butcher :-p
<queqiao->
⟨Al2Me6⟩ Heh, I've built it once or twice before... figured I should try the flight planner revamp
<queqiao->
⟨egg⟩ reference frame selector you mean?
<queqiao->
⟨Al2Me6⟩ Yep, brain farted
<queqiao->
⟨egg⟩ yeah having some early test-driving of that sounds like a good idea
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<queqiao->
⟨Butcher⟩ You want cat? I get you good cat.