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
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<discord-> B​utcher. — @Damien you about?
<discord-> D​amien. — still alive
<discord-> D​amien. — 2020 hasn't killed me off yet
<discord-> B​utcher. — Best way to get a GEO sat to a specific long?
<discord-> B​utcher. — I want one somewhat above my KSC for launch comms.
<discord-> D​amien. — make it bigger or smaller, drift it round, then recircularise
<discord-> D​amien. — that's the lazy way
<discord-> B​utcher. — Just as simple as that?
<discord-> D​amien. — yeah
<discord-> B​utcher. — Eh, I guess I'll do that/
<discord-> B​utcher. — Total budget to GEO is about 12.6k?
<discord-> D​amien. — !geo
<discord-> B​utcher. — Hmm, 13.5 ish, glad I checked!
<discord-> B​uilderbast. — 9300 + 2500 + 1950 or something like that
<discord-> A​dvaiceasker. — get into LEO, boost to GEO apoapsis, perform inclination change and circularise
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<discord-> B​utcher. — Yes, that is how to get to GEO, not how to get to a specific long.
<discord-> A​dvaiceasker. — I think theres some different parameters for different GTO orbits, you can try finding those (ULA has some good documentation for Atlas V and Delta IV and you can use their flight profiles if you want)
<discord-> A​dvaiceasker. — oh right the long bit
<discord-> A​dvaiceasker. — my apologies
<discord-> B​utcher. — You're a bit stuck because you need to do GTO at AN or DN for optimal dV usage.
<discord-> B​utcher. — But I can ust drift it when I'm close to GEO.
<discord-> B​uilderbast. — For specific long you will just drift 1/24th orbit per day if you increase or decrease period by 1 hhour
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<discord-> D​amien. — @Butcher if this is your first RSS/Principia GEO then directly over KSC might be a little bit unstable
<discord-> B​uilderbast. — If you wanna move 180 degrees, you change period by 1 hour and wait 12 orbits
<discord-> B​utcher. — Yeah, that's not one of teh stable areas, but it doesn;t have to be precise, just close.
<discord-> D​amien. — over brazil is stable
<discord-> B​utcher. — I need to be in LOS for comms, not exactly above.
<discord-> D​amien. — and close enougyh
<discord-> D​amien. — and close enough (edited)
<discord-> B​utcher. — I might run an omni rather than a dish too, I'll need to check what the angles are.
<discord-> D​amien. — 105°w if I remember correctly
<discord-> B​utcher. — TL5 UHF omni will do ship to shop at about 70Mm.
<discord-> B​utcher. — TL5 UHF omni will do ship to ship at about 70Mm. (edited)
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<discord-> B​utcher. — I can get goldstone from there too I imagine.
<discord-> D​RVeyl. — At TL5, you probably still benefit by at least the 0.5m dish at UHF, or even S.
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<discord-> B​utcher. — UHF is nice because I have that anyway for LEO comms with the ground.
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<discord-> D​RVeyl. — 0.5m dish should still be an improvement over the omni. Guesstimate [from source tools I used earlier] is 90 degrees and ~5.0 dBi versus 3 from the omni
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<discord-> A​dvaiceasker. — is stationkeeping in GEO required with principia?
<discord-> B​utcher. — 105W is perfect, since I'm launching out of VAFB.
<discord-> B​utcher. — My flight track is more or less right under it.
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<discord-> B​utcher. — 1.46 k dV, perfect. 😅
<discord-> B​utcher. — 14.6 k dV, perfect. 😅 (edited)
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<discord-> D​amien. — @Advaiceasker it depends how precise you need your position to be. It'll oscillate around due to the non-spherical nature of earth, and the moon
<discord-> D​amien. — if you can place it in one of the two stable longitudes you'll only have minor north/south oscillation due to the moon to worry about
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<discord-> R​urouniDonut. — Question, when a vessal is landed on the surface
<discord-> R​urouniDonut. — Does Principia still have to dedicate a lot of resources to it?
<discord-> B​utcher. — @DRVeyl 0.5m dish seems pretty good. 👍
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<discord-> D​amien. — @RurouniDonut I don't believe principia knows landed vessels exist
<discord-> R​urouniDonut. — gotcha
<discord-> R​urouniDonut. — so it wont do much if you delete them
<discord-> B​utcher. — ECEF planning for GEO is very nice.
<discord-> B​utcher. — 4 days to drift my orbit round to the correct latitude, not bad at all.
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<_whitenotifier-9244> [Principia] EricBorges2019 starred Principia - https://git.io/JJ86M
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<discord-> B​utcher. — @egg is it possible to have a solid line for planned trajectories?
<discord-> e​gg. — @Butcher what problem are you trying to solve?
<discord-> l​pg. — it'd be lovely for impacting on a specific spot
<discord-> B​utcher. — That mainly. Also greater visibility.
<discord-> e​gg. — they are the way they are because of accessibility concerns raised by ferram iirc
<discord-> e​gg. — so that the prediction, history, and plan are distinct by more than colour (solid, faded, dashed)
<discord-> e​gg. — re. impacting, note that this is unreliable because topography is not taken into account when drawing
<discord-> e​gg. — (the lines are drawn assuming a sphere)
<discord-> B​utcher. — Surely they just need to differ by luminance or something of the like?
<discord-> e​gg. — Ideally impacting would be calculated using the topography, and shown as an event on map view
<discord-> e​gg. — that way the trajectory before that would be irrelevant
<discord-> B​utcher. — Even without topography at the moment if you get a dash placed poorly you have no idea where the impact is to within tens of km or more.
<discord-> B​utcher. — Is it easy to change in code?
<discord-> e​gg. — it is not hard, but is it the right thing to do ultimately
<discord-> e​gg. — I should probably do something about computing correct impacts instead
<discord-> e​gg. — also I should pet a cat
<discord-> B​utcher. — I might hack my local build.
<discord-> l​pg. — I don't suppose line properties are defined in a nice .cfg?
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