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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<paculino> Celebratory cat photo for lunar phase.
<paculino> Tuxedonest is a warm spot for kitty.
<raptop> nest-building cats
<paculino> It was just three rectangular slabs of packed hay, but she swirled it around into one blob
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<_whitenotifier-7bc1> [Principia] pleroy commented on pull request #3465: Close the processes after running a test - https://github.com/mockingbirdnest/Principia/pull/3465#issuecomment-1326761679
<queqiao-> ⟨Kirk (He/Him)⟩ Old cat
<queqiao-> ⟨Kirk (He/Him)⟩ Meanwhile, the dogs all tried to run across the frozen pond and fell through the ice
<queqiao-> ⟨Kirk (He/Him)⟩ One of them tried again after we pulled him out
<queqiao-> ⟨Vlood⟩ ⟪Kirk (He/Him)⟫ One of them tried again after we pulled […] ⮪ sounds like a retriever
<paculino> One of Fluffy's kittens did that
<queqiao-> ⟨Kirk (He/Him)⟩ ⟪Vlood⟫ sounds like a retriever ⮪ It was an 8 month old mountain dog
<paculino> How thick is/was the ice?
<queqiao-> ⟨Kirk (He/Him)⟩ 8 month old led the charge, followed by lovable rescue. 3rd in line, the dog that actually lives here, learned his lesson about ice long ago and stopped at the edge. 4th and 5th in line, the smart dog and nervous dog, also stopped
<queqiao-> ⟨Vlood⟩ ⟪Kirk (He/Him)⟫ It was an 8 month old mountain dog ⮪ yeah ok, those also fit the dumb, but lovable description
<queqiao-> ⟨Kirk (He/Him)⟩ ⟪paculino⟫ How thick is/was the ice? ⮪ Less than an inch
<queqiao-> ⟨Kirk (He/Him)⟩ * inch?
<queqiao-> ⟨Vlood⟩ a friend has a half labrador retriever, half german shepherd mix; that dog literally never learns from his mistakes
<queqiao-> ⟨someonelse⟩ Try a terrier
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<queqiao-> ⟨Jexa Jexins⟩ whats a stable orbit for a moon orbiter?
<queqiao-> ⟨test_account⟩ see pinned messages here
<queqiao-> ⟨Jexa Jexins⟩ ⟪test_account⟫ see pinned messages here ⮪ ? dont see one with orbital heights?
<_whitenotifier-7bc1> [Principia] pleroy commented on pull request #3466: Add support for optimization of 1- or 2-D problems - https://github.com/mockingbirdnest/Principia/pull/3466#issuecomment-1326857725
<queqiao-> ⟨test_account⟩ this a = 1888km is somehow related to altitude
<queqiao-> ⟨test_account⟩ need to figure out what exactly a means
<queqiao-> ⟨Jexa Jexins⟩ okay... think we are not seeing same pinned messages...
<queqiao-> ⟨test_account⟩ the third one
<queqiao-> ⟨Jexa Jexins⟩ ohh lol easier to just come in and ajust every few days...
<queqiao-> ⟨test_account⟩ well, it's not, because you will run out of fuel or might even be unguided 🙂
<queqiao-> ⟨Jexa Jexins⟩ well i have no idea how to read tha
<queqiao-> ⟨Jexa Jexins⟩ * that
<queqiao-> ⟨test_account⟩ I'm fairly certain that a means semi-major axis
<queqiao-> ⟨test_account⟩ If enter a 100km circular orbit around the Moon in !calculator, its semi-major axis is 1837km
<queqiao-> ⟨Jexa Jexins⟩ ? !calculator ?
<queqiao-> ⟨test_account⟩ have you not used it? sorry for the spam then
<queqiao-> ⟨test_account⟩ !calculator
<queqiao-> ⟨Jexa Jexins⟩ no worries thanks for the tool
<queqiao-> ⟨test_account⟩ so, the graph in the middle is about a 100km circular orbit, the others are some other low circulat orbits
<queqiao-> ⟨Jexa Jexins⟩ right so i cant stay in a low moon orbit?
<queqiao-> ⟨test_account⟩ no, thats not it
<queqiao-> ⟨test_account⟩ it's a graph of something that is probably related to the stability of the orbit
<queqiao-> ⟨test_account⟩ I would guess that when it crosses 0, the orbit is stable, so use these inclinations
<queqiao-> ⟨test_account⟩ (x axis is inclination)
<queqiao-> ⟨test_account⟩ In particular, the 100km circular orbit with inclination 85 should be stable, if I'm reading it correctly, of which I'm not 100% sure.
<queqiao-> ⟨Jexa Jexins⟩ ⟪test_account⟫ In particular, the 100km circular orbit […] ⮪ litterally getting it spot on tho is tough
<queqiao-> ⟨Jexa Jexins⟩ do we ignore the y axis then ?
<queqiao-> ⟨test_account⟩ We don't ignore it, we probably want 0 on the y axis
<queqiao-> ⟨Jexa Jexins⟩ or right ofc
<queqiao-> all you really need to know is that.
<queqiao-> > [There are] a number of 'frozen orbits' where a spacecraft can stay in a low lunar orbit indefinitely. They occur at four inclinations: 27°, 50°, 76°, and 86°"
<queqiao-> ⟨egg⟩ ⟪test_account⟫ need to figure out what exactly a means ⮪ semimajor axis…
<queqiao-> ⟨egg⟩ and the y axis is just the eccentricity, with the sign telling you whether the periselene is over the north or the south pole
<queqiao-> ⟨egg⟩ so the 0-crossings are for circular orbits, but you have eccentric orbits elsewhere (though if the stable eccentricity is too high the orbit will have the slight issue of running into the ground)
<_whitenotifier-7bc1> [Principia] pleroy closed pull request #3465: Close the processes after running a test and retry process startup - https://github.com/mockingbirdnest/Principia/pull/3465
<_whitenotifier-7bc1> [Principia] pleroy closed pull request #3466: Add support for optimization of 1- or 2-D problems - https://github.com/mockingbirdnest/Principia/pull/3466