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-> ⟨e​gg⟩ 🌞 🌗 ☁️ 🥚
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<queqiao-> ⟨Z​eusbeer⟩ you got clouded for the eclipse ?
<queqiao-> ⟨Z​eusbeer⟩ rip, in The Netherlands it's only a 1/6th eclipse
<queqiao-> ⟨Z​eusbeer⟩ rip, in the Netherlands it's only a 1/6th eclipse (edited)
<queqiao-> ⟨e​gg⟩ yeah same here too, but with added clouds
<queqiao-> ⟨S​tonesmile⟩ I'm a bit further north - but completely covered in clouds 😕
<queqiao-> ⟨v​evladdd⟩ Will it be visible from South Africa?
<queqiao-> ⟨e​gg⟩ unless South Africa recently moved to Greenland, no
<queqiao-> ⟨S​tonesmile⟩ It is more visible the further north you are
<queqiao-> ⟨v​evladdd⟩ 😢😭
<queqiao-> ⟨v​evladdd⟩ Is it happening right now?
<queqiao-> ⟨e​gg⟩ yeah, somewhere behind those clouds >_<
<queqiao-> ⟨Z​eusbeer⟩ I got no clouds here, but I can't be bothered to look at the sun without those special glasses xd
<queqiao-> ⟨Z​eusbeer⟩ I got no clouds here, but I can't be bothered to look at the sun withou special glasses (edited)
<queqiao-> ⟨Z​eusbeer⟩ I got no clouds here, but I can't be bothered to look at the sun without special glasses (edited)
<queqiao-> ⟨Z​eusbeer⟩ I got no clouds here, but I can't be bothered to look at the sun without special glasses (edited)
<queqiao-> ⟨e​gg⟩ yeah that sounds like a bad idea; I was planning to watch it by projecting with a refractor
<queqiao-> ⟨S​ir Mortimer⟩ Wait I missed an eclipse?
<queqiao-> ⟨e​gg⟩ not much of one in AT to be fair https://pbs.twimg.com/media/E3el8f7WEAENp2d?format=jpg&name=orig
<queqiao-> ⟨Z​eusbeer⟩ (I feel the favorite map projection meme incoming)
<queqiao-> ⟨Z​eusbeer⟩ NL got screwed on the full solar eclipse like 6 years ago
<queqiao-> ⟨Z​eusbeer⟩ entire country got clouded
<queqiao-> ⟨Z​eusbeer⟩ 💀
<queqiao-> ⟨B​utcher⟩ Super cloudy here too, didn;t realise it was an eclipse.
<queqiao-> ⟨B​utcher⟩ Super cloudy here too, didn't realise it was an eclipse. (edited)
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<queqiao-> ⟨Z​eusbeer⟩ Yeah news companies ignores all the actually interesting news
<queqiao-> ⟨Z​eusbeer⟩ Yeah news companies ignore all the actually interesting news (edited)
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<queqiao-> ⟨e​gg⟩ yup UK looks like this https://twitter.com/AstroMikeMerri/status/1402940699008507905
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<queqiao-> ⟨B​utcher⟩ He did well to even get that!
<queqiao-> ⟨B​utcher⟩ Sun just came out. 😒
<queqiao-> ⟨B​utcher⟩ @egg Is it possible to have a slider for how far ahead to render the flight plan? I'm trying to look at the map and all the orbit lines are killing me but I don't want to mess with my flight plan.
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<queqiao-> ⟨e​gg⟩ can’t you just shorten the flight plan and lengthen it back up when you need it ?
<queqiao-> ⟨s​iimav⟩ My phone gets way too much sunflare when taking an image directly but it does have an interesting optical artifact at the bottom of the image.
<queqiao-> ⟨B​utcher⟩ @egg Not without losing my planned manoeuvre I think?
<queqiao-> ⟨B​utcher⟩ I have a manoeuvre planned 1080 days into the future. :-p
<queqiao-> ⟨a​ndyo1678⟩ and here I am, the australian, as far away from the eclipse as one can get
<queqiao-> ⟨e​gg⟩ shortening the flight plan doesn’t delete manœuvres ; what I am not sure of is whether the planner will let you set a length before that manœuvre (we support the state where the manœuvre is past the actual end of the plan though
<queqiao-> ⟨e​gg⟩ shortening the flight plan doesn’t delete manœuvres ; what I am not sure of is whether the planner will let you set a length before that manœuvre (we support the state where the manœuvre is past the actual end of the plan though) (edited)
<queqiao-> ⟨B​utcher⟩ Oh interesting.
<queqiao-> ⟨Z​eusbeer⟩ The dashed line continues no matter how long your prediction length is
<queqiao-> ⟨Z​eusbeer⟩ It's seperate
<queqiao-> ⟨B​utcher⟩ Not what I was talking about, but ok.
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<queqiao-> ⟨k​raimoco⟩ Well, I'm Brazilian so there was no eclipse here.
<raptop> Getting up at dawn for a partial eclipse seemed like a bad idea
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<_whitenotifier> [Principia] pleroy closed issue #2975: [Grassmanian branch] Crash when loading a pre-existing save - https://git.io/J3SXY
<queqiao-> ⟨P​aculino (ŝi/ri/she/they)⟩ Did you use the pinhole thing to get that, or do you have one of those filters (or welding mask glass)?
<queqiao-> ⟨l​pg⟩ still on Grassman, so perhaps no longer relevant, but this is fun. Flight plan as plotted:
<queqiao-> ⟨l​pg⟩ pressing Rebase updates times a bit, otherwise no change. then I ditch my current (empty) stage and hit Rebase, and...
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<queqiao-> ⟨r​ocketman⟩ not sure if this is the right place for this buut
<queqiao-> ⟨r​ocketman⟩
<queqiao-> ⟨r​ocketman⟩ I'm reading up on this orbital mechanics book, and I was wondering about ejection angle and ejection velocity, I assume because it's a hyperbolic orbit you would use the eccentricity of the orbit
<queqiao-> ⟨r​ocketman⟩ not sure if this is the right place for this buut
<queqiao-> ⟨r​ocketman⟩
<queqiao-> ⟨r​ocketman⟩ I'm reading up on this orbital mechanics book, and I was wondering about ejection angle and ejection velocity, I assume because it's a hyperbolic orbit you would use the eccentricity of the orbit to figure out the asymptote like you would with a conic section and then just use the characteristic energy equation to figure out the kinetic energy as the grav potential goes to zero? (edited)
<queqiao-> ⟨r​ocketman⟩ not sure if this is the right place for this buut
<queqiao-> ⟨r​ocketman⟩
<queqiao-> ⟨r​ocketman⟩ I'm reading up on this orbital mechanics book, and I was wondering about ejection angle and ejection velocity, I assume because it's a hyperbolic orbit you would use the eccentricity of the orbit to figure out the asymptote like you would with a conic section and then for hyperbolic excess just use the characteristic energy equation to figure out the kinetic energy as the grav potential goes to
<queqiao-> ⟨r​ocketman⟩ and then when you're trying to figure out the parameters of a solar orbit after escape would you just treat it as a problem where the probe's velocity at that point in the orbit is equal to the hyperbolic excess vector + the velocity vector of the earth in its orbit?
<queqiao-> ⟨r​ocketman⟩ and this is for keplerian orbits, I have no idea how you psychos deal with n-body gravitation and perturbations, haha
<queqiao-> ⟨r​ocketman⟩ and this is for keplerian orbits, I have no idea how you psychos deal with n-body gravitation and perturbations, haha (edited)
<queqiao-> ⟨r​ocketman⟩ .
<queqiao-> ⟨r​ocketman⟩
<queqiao-> ⟨r​ocketman⟩ and this is for keplerian orbits, I have no idea how you psychos deal with n-body gravitation and perturbations, haha (edited)
<raptop> Generally with numeric solutions
<raptop> Uh, for positioning to switch between planetary orbit and solar orbit for patching conics, generally use the sphere of influence (r = a_planet*(m_planet/m_star)^0.4)
<queqiao-> ⟨K​obymaru⟩ Yeah good luck with that haha
<queqiao-> ⟨K​obymaru⟩ I tried for a bit, but the issue is a) that Transfer Window planner does not provide the declination and RAAN of that excess vector and b) I don't know how to translate those values into parameters that Principia shows
<queqiao-> ⟨K​obymaru⟩ best thing in practice for plantes except venus/mars is to just aim for the prograde/retrogade vectors of Earth
<queqiao-> ⟨K​obymaru⟩ for venus and mars that doesnt work because the low excess velocity means the hyperbolic orbit is too curved
<queqiao-> ⟨K​obymaru⟩ so in that case I used a defunct upper stage on the right orbit, and twiddled with the maneuver planner in the tracking station
<queqiao-> ⟨K​obymaru⟩ basically adding one maneuver to tilt the orbit (maintaining inclination but changing LAN) and a second node for the transfer burn
<queqiao-> ⟨K​obymaru⟩ after you find an encounter you can delete the transfer burn, and read out the LAN of the target orbit
<queqiao-> ⟨K​obymaru⟩ MechJeb,KSP LAN = Principia LAN - 90°
<queqiao-> ⟨K​obymaru⟩ then just launch into an orbit with that LAN to get a good parking orbit
<queqiao-> ⟨K​obymaru⟩ gotta do the transfer burn soon after launch though because of nodal precession
<queqiao-> ⟨r​ocketman⟩ oh cool thanks for the reply
<queqiao-> ⟨r​ocketman⟩ I was just talking in theory but it makes sense that the orbit would be too curved as it the sun's gravitational influence begins to take over to just use the theoretical hyperbolic excess
<queqiao-> ⟨r​ocketman⟩ thank you, that is excellent
* raptop hails NTRS like it's The Probe