UmbralRaptop changed the topic of #principia to: READ THE FAQ: http://goo.gl/gMZF9H; The current version is Fuchs. We currently target 1.5.1, 1.6.1, 1.7.x, 1.8.1, and 1.9.1. <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… | <egg> also 4e16 m * 2^-52 is uncomfortably large
<discord-> e​gg. — There definitely is quite a lot in RealAntennæ that should nicely eggstend to microwave imaging/SAR/Radar altimeters in KC…
<discord-> D​RVeyl. — That's quite a narrow one! But yeah. 🙂 Should extend pretty well.
<discord-> e​gg. — @DRVeyl it is definitely very silly for comms :D but for radar altimetry it might not be that outlandish (that is the RA-100 dish, in Ka)
<discord-> e​gg. — (if you want to go to really absurd swaths you have laser altimetry)
<discord-> e​gg. — yeah the ICESat laser altimeter has a pixel size of 66 m on the ground :D
<discord-> e​gg. — (the spacing between adjacent swaths on the equator over the whole mission is 15 km, so there is no overlap)
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<discord-> C​onventia. — Is there a good way to do rendezvous planning?
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<discord-> C​onventia. — I see... the UI is a bit... weird. But the wiki seems helpful.
<discord-> C​onventia. — I got it to look like this, which makes sense!
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<Blu3wolf> it occurs to me that theres a good chance the warp drive mod Ive got isnt going to work with Principia. Roverdudes Alcubierre warp drive mod? Anyone familiar with/can confirm/deny its compatibility?
<discord-> B​utcher. — @egg When do I get a feature in the orbit analyser that tells me how long until I crash into the moon?
<iSHELLraptop> (The feature is actually a plugin to let you use everyone's favorite FORTRAN code)
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<discord-> B​utcher. — A thorough Lunar survey.
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<discord-> B​utcher. — @egg Maybe principia, maybe not? I had a probe coming in upside down, chutes opened, probe accelerated from ~50 m/s to 5240 m/s and exploded due to stress.
<discord-> B​utcher. — When ti tried to flip over.
<discord-> B​utcher. — When it tried to flip over. (edited)
<discord-> B​utcher. — Then the game booted me back to the space center so I couldn;t analyse the flight log.
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<discord-> e​gg. — Hmm...
<discord-> e​gg. — > The attitude control law for Jason is identical to that of Topex/Poseidon. Its yaw motion is designed to keep the proper orientation of the solar panel rotation axis. Its pitch motion keeps the altimeter antenna pointed perpendicular to the reference ellipsoid. When the angle of the Sun over the orbit plane is smaller than 15 degrees, the yaw rotations are stopped and the satellite is placed in fixe
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<discord-> e​gg. — @DRVeyl if I start implementing sufficiently fancy attitude control laws it might become viable to model antenna pointing :-p
<discord-> e​gg. — > @egg When do I get a feature in the orbit analyser that tells me how long until I crash into the moon?
<discord-> e​gg. — @Butcher so, minimal altitude over the mission duration I suppose?
<discord-> D​RVeyl. — I was thinking of that but wanted to avoid the can of worms. 😉
<discord-> B​utcher. — Yes, I had engine failure during orbital insertion so it achieved a suborbital trajectory and came back down.
<discord-> e​gg. — yeah it is a can of worms that we can reopen in a few years
<discord-> B​utcher. — Altitude maybe 180 km.
<discord-> D​RVeyl. — BUT since RA already has explicit Kerbalism detection and some special handling for it [mainly the background power draw], and it does it through Reflection, there's no reason RA cannot also do some eggstra stuff [damnit, now I'm doing it] for Principia.
<discord-> e​gg. — hahahaha
<discord-> D​RVeyl. — Similar, if you need to pull any of the stuff from the Physics file in RA, if there's a better way to make that accessible then happy to chat. 🙂
<discord-> e​gg. — @Butcher hmm, you were suborbital from the start? but then the orbit analyser doesn’t have much to say, does it?
<discord-> B​utcher. — Oh sorry.
<discord-> B​utcher. — Wrong launch.
<discord-> B​utcher. — My lunar orbit is about 120km x 1100km.
<discord-> B​utcher. — And yes, minimla altitude would be handy.
<discord-> e​gg. — I will have to poke about how best to express it
<discord-> e​gg. — like that « 120 km » it is a global statement about a local property, contrary to the mean elements
<discord-> e​gg. — the Sentinel-3 solar array is clever
<discord-> e​gg. — it pivots on an axis, but that axis is at 24° from the plane of the array
<discord-> e​gg. — and the spacecraft is on a heliosynchronous orbit, so that by guiding orienting itself nadir & along-track, it maintains that constant angle to the sun, so that one degree of freedom is enough to track the sun
<Blu3wolf> it occurs to me that theres a good chance the warp drive mod Ive got isnt going to work with Principia. Roverdudes Alcubierre warp drive mod? Anyone familiar with/can confirm/deny its compatibility?
<discord-> e​gg. — Warp drives almost certainly will not work
<Blu3wolf> in fact recalling that part of the FAQ was what prompted the question
<Blu3wolf> Is there any way for the other mod to hook into what Principia does to make it compatible, or is that all on Principias side?
<discord-> e​gg. — No, there is no mechanism for that; no warp drives in Principia. More generally, interstellar travel is largely infeasible with Principia (timewarp rate being bounded by computing power)
<Blu3wolf> Ah well. Ive been meaning to play with that mod for so long... but I never get far enough into a career save to do so. I guess it wont happen in this one, either.
<discord-> S​irius. — How I should go into a Lunar Polar Orbit without spending a lot of Delta V to change my inclination?
<discord-> D​amien. — change your inclination as far from the moon as possible
<discord-> D​amien. — with a small correction burn just after performing TLI
<discord-> S​irius. — Does it works if I go into a Earth Polar Orbit and I go for the TLI?
<discord-> D​amien. — that seems like a waste of dv in getting into that parking orbit
<Blu3wolf> consider the difference in orbital planes between your normal transfer orbit, and the polar orbit at Earth
<discord-> D​amien. — you can get into any lunar orbit you want just by doing a very cheap correction while on the way to the moon
<Blu3wolf> would be fairly hard IMO to get an Earth Polar Orbit with exactly correct plane to depart at the right time, compared to a normal parking orbit
<discord-> D​amien. — ^
<Blu3wolf> whats the word for this? the angle that the inclined plane slices the plane of the equator?
<discord-> l​pg. — Don't think of it as an inclination stage. You just need to change your trajectory so that it goes above a pole
<discord-> B​utcher. — I do polar direct ascent for lunar launches which means I fly over the Earth's South Pole, I usually end up fairly close to equatorial at the moon without a correction.
<discord-> S​irius. — How the correction burn should looks like?
<discord-> D​amien. — it depends on what your TLI does for your inbound trajectory
<discord-> D​amien. — have a play with the flight planner
<discord-> D​amien. — it'll be very cheap
<Blu3wolf> if you are on a trajectory in the same orbital plane as the moon, on an impact trajectory, burning 90 degrees to the orbital plane will move your trajectory away from the orbital plane. It will raise/lower the lunar latitude you arrive at, moving your impact away from the lunar equator.
<discord-> D​amien. — if you're heading towards an anticlockwise equatorial orbit, then some radial (normal on principia window) to shift it towards the centre of the mun, then some normal (binormal on principia window) to move up or down will probably do it
<discord-> e​gg. — @Butcher hmm. We could also compute the mean perigee altitude https://help.agi.com/stk/11.0.1/Subsystems/dataProviders/Content/Satellite~Kozai-Izsak_Mean~ICRF.htm
<discord-> B​utcher. — Would you be able to calculate the deviation?
<discord-> B​utcher. — @egg Is galileo tearing my probe apart?
<discord-> e​gg. — yeah, the nice thing with mean elements is that you could compute them at each point in time
<discord-> e​gg. — @Butcher tearing your probe apart? that is odd
<discord-> B​utcher. — When I try to change orientation with RCS I: sometime sget huge force generated.
<discord-> B​utcher. — When I try to change orientation with RCS I sometimes get huge force generated. (edited)
<discord-> e​gg. — and you had none of that with Fuchs?
<discord-> B​utcher. — It goes from almost at rest to literally flying part due to g forces.
<discord-> B​utcher. — Nope.
<discord-> e​gg. — hm.
<discord-> B​utcher. — This is an example.
<discord-> e​gg. — are there centre of mass offsets involved?
<discord-> B​utcher. — 280G is a lot of accelertion.
<discord-> e​gg. — quite.
<discord-> B​utcher. — Shouldn't be. I can double check in case I accidentally added one.
<discord-> e​gg. — @Butcher many stock parts have those
<discord-> B​utcher. — I'm just reloading with the main galileo build, rather than my local build (which also has your rebase PR in).
<discord-> e​gg. — if you have set things up to build Principia you can flip the show_2519_debugging_ui flag
<discord-> B​utcher. — I'm not using stock parts for the most part.
<discord-> e​gg. — that will dump the offsets to the UI
<discord-> B​utcher. — It's a heat shield, a procedural avionics unit and a chute.
<discord-> B​utcher. — Plus the RCS thrusters of course.
<discord-> B​utcher. — com offsets for the avionics unit show as 0.
<discord-> e​gg. — @Butcher since you know how to build Principia, you can try dichotomy; the two pull requests that might affect things are 2604 and 2602
<discord-> B​utcher. — Right, I'll do a bit of testing.
<discord-> B​utcher. — I might try this craft with Fuchs, as well just to elimiate possibilities.
<discord-> B​utcher. — First test with the main build, it just worked. Maybe it's my local build.
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<discord-> B​utcher. — Hmm, nope, happenes with main build.
<discord-> B​utcher. — That is some g indeed.
<discord-> B​utcher. — Also 0.1% c.
<discord-> B​utcher. — Almost 0.1% c. (edited)
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<discord-> B​utcher. — @egg Trying 2602 now.
<discord-> B​utcher. — I have a blinc cat on me though.
<discord-> B​utcher. — I have a blind cat on me though. (edited)
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<raptop> Is the cat purring?
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<discord-> e​gg. — speaking of cats I should calibrate mine
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<discord-> e​gg. — > I might try this craft with Fuchs, as well just to elimiate possibilities.
<discord-> e​gg. — @Butcher you probably want to do that first if you haven’t already
<discord-> e​gg. — if it’s in Fuchs, there is no point in looking between Fuchs and Galileo
<discord-> B​utcher. — I have not yet. It definitely occurred in galileo though, on your build.
raptop changed the topic of #principia to: READ THE FAQ: http://goo.gl/gMZF9H; The current version is Galileo. We currently target 1.5.1, 1.6.1, 1.7.x, 1.8.1, and 1.9.1. <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… | <egg> also 4e16 m * 2^-52 is uncomfortably large
<discord-> e​gg. — > For SPOT5 only, the platform is controlled in yaw steering mode in order to inbalance the line drift effect due to the
<discord-> e​gg. — > Earth rotation (see fig. 9). Yaw angle is continuously changed depending on the latitude of the satellite. This operation
<discord-> e​gg. — > allows to suppress the “black pixels” introduced when processing level 1B scenes (see fig. 10).
<discord-> e​gg. — lots of fun attitude control laws…
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<_whitenotifier-d13c> [Principia] Pending. Build queued… - 
<_whitenotifier-d13c> [Principia] Pending. Building… - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/4344/
<_whitenotifier-d13c> [Principia] pleroy reviewed pull request #2609 commit - https://git.io/JfxJV
<_whitenotifier-d13c> [Principia] pleroy reviewed pull request #2609 commit - https://git.io/JfxJw
<_whitenotifier-d13c> [Principia] Success. Build finished. - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/4344/
<discord-> F​alcon. — what do you all think? is this a good NHRO like orbit?
<discord-> F​alcon. — its Apoapsis needs to be higher
<discord-> F​alcon. — but other than that it is pretty close to what is projected for Gateway