raptop changed the topic of #principia to: READ THE FAQ: http://goo.gl/gMZF9H; The current version is Fréchet. We currently target 1.5.1, 1.6.1, and 1.7.x. <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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<_whitenotifier-d13c> [Principia] spacefan starred Principia - https://git.io/JfgrK
<discord-> S​ir Mortimer. — Does principia compute on the GPU?
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<discord-> B​utcher. — I don't think so @Sir Mortimer
<discord-> B​utcher. — I'm not sure how practical it is for what they're doing.
<_whitenotifier-d13c> [Principia] pleroy tagged 17b8ecd as 2020052218-Fuchs https://git.io/JfgXx
<_whitenotifier-d13c> [Principia] pleroy created tag 2020052218-Fuchs - https://git.io/fpDwq
<_whitenotifier-d13c> [Principia] pleroy tagged 828547f as 2020051701-TEST2574 https://git.io/JfgXp
<_whitenotifier-d13c> [Principia] pleroy created tag 2020051701-TEST2574 - https://git.io/fpDwq
<discord-> K​obymaru. — since the problem is time-dependent, the next state depends on all the previous states. So you can't parallelize the calculation by time
<discord-> K​obymaru. — you could parallelize by crafts, but that only starts to make sense when you have hundreds thousands of spacecraft. Before that, it's just additional overhead. And your main CPU cores are much faster than the cores on your GPU.
<_whitenotifier-d13c> [Principia] realzh starred Principia - https://git.io/JfgMF
<discord-> B​utcher. — The bigger issue is latency gettingnthe data to and fro the GPU.
<discord-> S​tandecco. — principia parallelizes different vessels on different threads, iirc
<discord-> S​tandecco. — but nothing on the GPU
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<_whitenotifier-d13c> [Principia] pleroy deleted tag 2020051701-TEST2574 - https://git.io/fpDwq
<_whitenotifier-d13c> [Principia] pleroy deleted tag 2020051701-TEST2574
<discord-> S​ir Mortimer. — I thought the topic came up already
<discord-> e​gg. — @Sir Mortimer how is KC doing, I haven’t followed the latest developments
<discord-> e​gg. — have you looked at the GNSS DOP thing ?
<discord-> S​ir Mortimer. — DOP not yet. I’ve got a couple of contracts that I’m playtesting myself, they’re all more or less revolving around real satellites. Last contract I addded is one that wants a satellite view of the earth with the sun in the back, it’s an excuse for @Damien to do something at ESL1 mostly.
<discord-> e​gg. — ah, the DSCOVR contract
<discord-> D​amien. — don't mention that name egg
<discord-> e​gg. — Triana :-p
<discord-> S​ir Mortimer. — One of my gripes is parts, I’m currently poaching BDB for instruments that remotely look like the real thing.
<discord-> D​amien. — DSCOVR aka goresat, which has an ingame part literally called goresat, that you can't use at ESL1 to do the experiment it actually does
<discord-> e​gg. — (the Capderou book talks about Triana, because that was its name at the time)
<discord-> S​ir Mortimer. — @Damien that’s a DMOS part. All rights reserved.
<discord-> e​gg. — Deep Space Climate ObserVatoRy
<discord-> D​amien. — ksp situation restrictions are tyranny
<discord-> e​gg. — makes STARLETTE look reasonable
<discord-> D​amien. — why can't I do earth science from a solar orbit?
<discord-> D​amien. — *rage*
<discord-> e​gg. — yeah SoI-based situation restrictions are irrelevant in a KC world
<discord-> S​ir Mortimer. — Can’t be helped I’m afraid, @Damien
<discord-> D​amien. — I know, still fun to bitch about it though
<discord-> S​ir Mortimer. — You’ll get science points for the contract. Fair enough?
<discord-> e​gg. — the sophisticated requirements of KC do effectively incorporate experiment requirements
<discord-> e​gg. — so effectively it seems to subsume most of the role of stock science
<discord-> S​ir Mortimer. — I also thought about earth observations from ESL4/5 but that’s so far away it would be a terrible excuse for going there
<discord-> e​gg. — yeah iirc Spitzer wanted to go there at some point?
<discord-> e​gg. — well, Spitzer has wanted to go literally everywhere at some point in its design process
<discord-> e​gg. — cc @𒀯 𒄷 𒄈𒀭𒁇
<discord-> e​gg. — (also cc UmbralRaptor in case you are on IRC but not here)
<discord-> S​ir Mortimer. — What’s a good excuse for L2?
<discord-> e​gg. — @Sir Mortimer really L4/L5 is a thing that can arise as a possible solution for a bunch of things, you don’t need to have a contract that specifically steers you to it
<discord-> e​gg. — STEREO is what I was thinking of
<discord-> e​gg. — one of the plans for STEREO was to have them at L4 and L5
<discord-> e​gg. — instead they ended up on normal earth-leading and earth-trailing solar orbits
<discord-> S​ir Mortimer. — Yeah, and one at L3 for full coverage 🙂
<discord-> D​amien. — yeah ESL4/5 are useful
<discord-> e​gg. — so « look at a bunch of the sun » is a requirement that *can* (but need not!) be fulfilled that way
<discord-> D​amien. — EML4/5 only really good for relays
<discord-> e​gg. — > Yeah, and one at L3 for full coverage 🙂
<discord-> e​gg. — That one really needs a relay obviously
<discord-> S​ir Mortimer. — But that contract already exists. It also plays into how good your solar storm warnings will be, and if you get one at all 😇
<discord-> e​gg. — the sun is not exactly transparent
<discord-> e​gg. — hah, was trying to look up the STEREO stuff, and of course, I come across the Capderou book https://books.google.fr/books?id=jRQXQhRSrz4C&pg=PA388&lpg=PA388&dq=stereo+satellites+lagrange&source=bl&ots=RQSudhMzos&sig=ACfU3U0jEf8hepO_yxSsdPHlcJROy8Kq1g&hl=fr&sa=X&ved=2ahUKEwi9-O_z68TpAhUkzoUKHRGOABUQ6AEwA3oECAgQAQ#v=onepage&q=stereo%20satellites%20lagrange&f=false
<discord-> S​ir Mortimer. — Not my problem 🤪
<discord-> e​gg. — (good book btw, strongly recommend)
<discord-> e​gg. — @Sir Mortimer yeah, you just need to make sure that somehow the system does require comms back to earth to get the data, not just "having something in L3"
<kmath> <eggleroy> Michel Capderou (2012), Satellites : de Kepler au GPS. https://t.co/vAqW1Adq8Z
<discord-> S​ir Mortimer. — One of the things I have to keep in mind tho is the playability of the contracts without principia. So they get a few parameters that might seem odd, or too easy when you really use principia.
<discord-> e​gg. — yeah
<discord-> e​gg. — but it is quite rare for something to only have multibody-dependent solutions
<discord-> e​gg. — do you have an eggsample of such a parameter?
<discord-> S​ir Mortimer. — DISCOVR. You can’t remain at a position with the sun in your back.
<discord-> S​ir Mortimer. — So instead of „do this for X days without interruption“ it’s just „do this for a total duration of X days“
<discord-> e​gg. — this is, tbh, perfectly reasonable
<discord-> e​gg. — because we don’t really want to steer people into exactly one solution
<discord-> e​gg. — and "~full-globe illuminated pictures" is a thing that we do IRL with non-DSCOVR things too
<discord-> e​gg. — lots of stuff from GEO
<discord-> e​gg. — siehe https://www.youtube.com/watch?v=JCsfTlpk9ak
<kmath> YouTube - What Does A Solar Eclipse Look like From Space?
<discord-> S​ir Mortimer. — I still need to come up with a good restriction that prohibits doing kerbin observations from moho
<discord-> e​gg. — ひまわり8号
<discord-> e​gg. — @Sir Mortimer that is a relation of telescope bulk to angular resolution mostly
<discord-> e​gg. — I can probably give you a back-of-the-envelope calculation for that (or @𒀯 𒄷 𒄈𒀭𒁇 can)
<discord-> e​gg. — the diffraction limit relates angular resolution to aperture, give the contract some requirement of minimal spatial resolution at the surface of the imaged body, and from Moho you start needing immense telescopes
<discord-> e​gg. — that restricts you insofar as you don’t launch the VLT to moho
<discord-> e​gg. — and tbh, if you want to launch the VLT to moho, I have no problem with you being able to fulfil that contract
<discord-> S​ir Mortimer. — 😂
<discord-> S​ir Mortimer. — Anyone got an idea for white?
<discord-> S​ir Mortimer. — Black is planning for a discovered check: c4, Nf3, forking king and queen...
<discord-> S​ir Mortimer. — I’m thinking Kh1
<discord-> S​tandecco. — and then?
<discord-> S​ir Mortimer. — Depends on what this indian guy does next 🙂
<discord-> D​amien. — @Sir Mortimer the pro gamer move is to start a game with someone, and also a master level bot. you put all their moves in vs the bot and play the bot's moves vs your opponent
<discord-> S​tandecco. — just copy alpha go
<discord-> S​tandecco. — the chess version
<discord-> S​tandecco. — alpha zero?
<discord-> S​tandecco. — can't remember at all
<discord-> S​ir Mortimer. — That’s lame. Computers play differently.
<discord-> D​amien. — @Sir Mortimer it's blatant cheating, pls don't do that lol
<discord-> D​RVeyl. — Raf1 stops c4.
<discord-> S​ir Mortimer. — I’ve had opponents doing that to me
<discord-> D​RVeyl. — This is "live" game, not puzzle?
<discord-> S​ir Mortimer. — 3 days max per move against humans, on chess.com.
<discord-> e​gg. — @Sir Mortimer so, re. the Kerbin-from-Moho eggsample; if you want a 1 km resolution (so that the imaged disk is effectively 1 megapixel), at the closest possible distance between Moho and Kerbin, in green light, you need a telescope 86.7 metres in diametre
<discord-> D​RVeyl. — Three days per move? That's hella correspondence!
<discord-> e​gg. — gotta allow time for postage
<discord-> e​gg. — ship the board
<discord-> S​ir Mortimer. — The longest I’ve played is 2 weeks per move. Never again.
<discord-> S​tandecco. — my terribly ignorant about chess brain (I just know the rules and that's almost it) would probably move f4 to f5 and see what happens
<discord-> S​tandecco. — my terribly-ignorant-about-chess brain (I just know the rules and that's almost it) would probably move f4 to f5 and see what happens (edited)
<discord-> D​amien. — disregard all other pieces, use the queen as john wick
<discord-> S​tandecco. — if anyone wants to explain to me why it would be a terrible move, I'd be happy
<discord-> S​ir Mortimer. — The best chess primer <https://youtu.be/ztc7o0NzFrE>
<discord-> e​gg. — @Sir Mortimer ok so 1 km resolution on Kerbin was perhaps a bit stringent
<discord-> e​gg. — doing a similar calculation for EPIC on DSCOVR, I get 58 km resolution on Earth
<discord-> S​ir Mortimer. — How do you calculate that?
<discord-> e​gg. — Airy disk
<discord-> S​ir Mortimer. — @Standecco f5 would get taken, leaving the pawn on e isolated and thus weakened
<discord-> e​gg. — angular resolution of 1.22 λ/d, d being the aperture
<discord-> e​gg. — multiply that by the range, get the linear resolution at that range
<discord-> e​gg. — wait nevermind my cheesy calculations are too cheesy
<discord-> e​gg. — eh, should work well enough for these purposes
<discord-> e​gg. — ah, I was using the wrong wavelength.
<discord-> e​gg. — that explains things.
<discord-> e​gg. — @Sir Mortimer those numbers were for near infrared, not green
<discord-> e​gg. — for near UV (310 nm) at Moho, you need a 2.75 m aperture to get 1 km resolution when imaging Kerbin; for green (500 nm), 4.44 m
<discord-> D​RVeyl. — Rad1 stops c4. (edited)
<discord-> e​gg. — so yes, if you put something bigger than Hubble on Moho, you start getting decent Earth imagery
<discord-> e​gg. — that is fine
<discord-> e​gg. — so yes, if you put something bigger than Hubble on Moho, you start getting decent Kerbin imagery (edited)
<discord-> S​ir Mortimer. — 1 km Resolution refers to pixel size, right?
<discord-> e​gg. — @Sir Mortimer well, to absolute minimum pixel size
<discord-> e​gg. — i.e., at that aperture & in that wavelength, smaller pixels than that give you no more, no matter how good your instrument is
<discord-> e​gg. — you can use larger pixels though (to downlink smaller images, or to get more light, etc.)
<discord-> e​gg. — https://en.wikipedia.org/wiki/Deep_Space_Climate_Observatory#EPIC says that EPIC has 25 km/px, even though in green, it is diffraction limited to about 3 km/px
<discord-> e​gg. — and in its longest wavelength of 779 nm the diffraction limit for Earth seems to be about 4.6 km
<discord-> e​gg. — (using its 30.5 cm aperture)
<discord-> e​gg. — So basically, parts that do imaging should have an aperture, part designers should ensure that the part is larger than the aperture and has a mass that makes sense for a telescope of that aperture, and your range limit will come out naturally
<discord-> e​gg. — (and that still allows for ground-based observation from Moho if that happens to be convenient for a player who has a base there and massive launchers :-p)
<discord-> e​gg. — @Sir Mortimer should I move https://github.com/Kerbalism/Kerbalism/wiki/Dev-~-Satellite-Contracts to the KC repo?
<discord-> e​gg. — it might be useful to add those diffraction limit observations
<discord-> e​gg. — but if I am touching this, might as well deal with the question of where it should go
<UmbralRaptop> figures that optics discussion happens while sleeping
<discord-> D​RVeyl. — Not sure we've made it to discussion so much as 'preface' so far 😉
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<discord-> e​gg. — opticks
<discord-> e​gg. — clearly since we have a KSP mod called *Principia* we need one called *Opticks*
<UmbralRaptop> In which we consider focal ratios, Seidel aberrations, etc?
<discord-> S​ir Mortimer. — @egg move the wiki page, please
<discord-> e​gg. — @Sir Mortimer do I have that power
<discord-> e​gg. — (I don’t think I can edit the KC wiki)
<discord-> S​ir Mortimer. — Oh
<discord-> S​ir Mortimer. — Wait...
<discord-> S​ir Mortimer. — @egg now you should
<discord-> e​gg. — indeed
<discord-> 𒀯​ 𒄷 𒄈𒀭𒁇. — If for some reason we're simulating detectors, the rule of thumb is ~2.5 pixels/resolution element. I think you want airy disk diameter for that.
<discord-> e​gg. — I’m not sure going into the weeds of detectors helps much (since parts are atomic, I don’t think making the player do instrument design is in scope), so the resolution element is probably the relevant quantity rather than the pixel
<discord-> 𒀯​ 𒄷 𒄈𒀭𒁇. — procedural telescope parts! (this is probably not a good idea)
<discord-> S​ir Mortimer. — Well in the end it boils down to a distance limitation that can be set on the part module, or on contract level.
<discord-> 𒀯​ 𒄷 𒄈𒀭𒁇. — It also gets into why the planetary science portion of the contract discussion is blank
<discord-> S​ir Mortimer. — Maybe procedural telescopes light: one part with 2-3 variants
<discord-> D​RVeyl. — Someone convince me there's enough overlap in Kerbalism and Principia to do this? 😉
<discord-> D​RVeyl. — Someone convince me there's enough overlap in Kerbalism and Principia to do this? 😉 🎣 (edited)
<discord-> D​RVeyl. — ~~Someone convince me~~ (Sanity returned:I will be glad if nobody convinces me there's enough overlap in Kerbalism and Principia to do this) 😉 🎣 (edited)
<discord-> D​RVeyl. — ~~Someone convince me~~ (Sanity returned: I will be glad if nobody convinces me there's enough overlap in Kerbalism and Principia to do this) 😉 🎣 (edited)
<discord-> 𒀯​ 𒄷 𒄈𒀭𒁇. — The nice thing is that this would give tradeoffs like "send large telescope into easy orbit" vs "send small telescope into hard orbit" I think?
<discord-> 𒀯​ 𒄷 𒄈𒀭𒁇. — ...but if it costs SAN
<discord-> e​gg. — @Sir Mortimer yeah it is a distance limit, but one that depends both on contract (desired resolution) and part (aperture)
<discord-> e​gg. — @𒀯 𒄷 𒄈𒀭𒁇 well, I don’t think you need *procedural* telescopes for that
<discord-> e​gg. — you need multiple telescopes differing in size
<discord-> e​gg. — but not necessarily a continuous space of telescopes
<discord-> 𒀯​ 𒄷 𒄈𒀭𒁇. — Well, yes
<discord-> e​gg. — space telescope space
<discord-> e​gg. — also, galaxy brain: send large telescope into hard orbit
<discord-> 𒀯​ 𒄷 𒄈𒀭𒁇. — axes: diameter, wavelength, f/ratio?
<discord-> e​gg. — see e.g. the option of tossing the VLT onto Mercury to fulfill a DSCOVR-type contract :D
<discord-> S​ir Mortimer. — djeez the mac native client is terrible with fonts
<discord-> 𒀯​ 𒄷 𒄈𒀭𒁇. — In all seriousness, sticking GMT in Caloris basin should be an option
<discord-> e​gg. — yeah, I agree
<discord-> e​gg. — people build bases
<discord-> S​ir Mortimer. — where is Caloris basin?
<discord-> e​gg. — and if they build bases, the ease of relevant contracts should change realistically
<discord-> 𒀯​ 𒄷 𒄈𒀭𒁇. — @Sir Mortimer Yeah, gnome terminal seems good, xterm bad. Also firefox bad on ubuntu
<discord-> S​ir Mortimer. — @boxboxboxboxbox i'll uninstall this thing here. it works better in the browser.
<discord-> e​gg. — tbh I am not completely sure whether 𒄈𒀭𒁇 is a correct sumerogram
<discord-> e​gg. — I should check the CAD
<discord-> S​ir Mortimer. — so. bottom line - what do we do with telescopes?
<discord-> e​gg. — bottom line: telescopes have some properties
<discord-> S​ir Mortimer. — i'd like to avoid using too many different parts. so one part with ~3 different setups / sizes would seem OK
<discord-> e​gg. — wavelengths, aperture, maybe focal ratio
<discord-> e​gg. — bear in mind that, e.g., Hubble is a telescope in the same way that EPIC is
<discord-> e​gg. — just a much bigger one
<discord-> 𒀯​ 𒄷 𒄈𒀭𒁇. — Some sort of FoV consideration, anyway. (Unless we want to assume that anything that's not x-ray is diffraction limited?)
<discord-> e​gg. — we could assume that I suppose
<discord-> S​ir Mortimer. — yes. and also one that can't look into the sun, while some corona observation thingies can't look anywhere else
<discord-> e​gg. — yeah most things can’t look into th esun
<discord-> 𒀯​ 𒄷 𒄈𒀭𒁇. — Can't look at something x magnitudes brighter than typical target, and can't look near something y magnitudes brighter?
<discord-> S​ir Mortimer. — also, throwing telescope building at KSP players is probably going to be too complicated. it needs to be dumbed down
<discord-> e​gg. — yeah I agree
<discord-> S​ir Mortimer. — (and I know that saying that on the RO discord is probably going to get me banned)
<discord-> e​gg. — hence parts that are telescopes, and have a handful of number synthesizing that
<discord-> e​gg. — and then for solar system observation, requirements are about resolution (that can be expressed as spatial resolution at the surface), how much of the body is seen, in what light, and that defines the space of solutions
<discord-> 𒀯​ 𒄷 𒄈𒀭𒁇. — Also, those should be soft can'ts. Probably don't actually damage the telescopes
<discord-> e​gg. — so the DSCOVR-type contract is see more than some percentage of the body in full illumination, with *some* small enough that you can fulfill it from GEO (Himawari-type solution), but if you have base on Mercury with giant telescopes this naturally becomes an option
<discord-> e​gg. — (and L1 obviously works, too)
<discord-> S​ir Mortimer. — there is another thing that will be problematic: distances in stock systems vs. RSS. The stock system is so samll, you basically can throw a rock to jool when standing on moho.
<discord-> e​gg. — that is a matter of configuration
<discord-> S​ir Mortimer. — there is another thing that will be problematic: distances in stock systems vs. RSS. The stock system is so small, you basically can throw a rock to jool when standing on moho. (edited)
<discord-> S​ir Mortimer. — ok. so a telescope gives you a resolution R at distance D, where R = f(D). Contracts require a minimum resolution for whatever they're doing. KC comes with a selection of telescopes of different sizes, and you better select a telescope that is not too small.
<discord-> S​ir Mortimer. — not having separate parts for all types of missions would be a plus, because part spam is an issue.
<discord-> e​gg. — yeah you definitely want to abstract as much as possible, also because it is very cool if you can reuse a part from an old mission
<discord-> S​ir Mortimer. — so, the thing that looks at the sun also looks at earth, although you wouldn't pull that off in reality.
<discord-> e​gg. — we might want to have separate parts for solar observation specifically, since they are so different
<discord-> e​gg. — but if you want to reuse Spitzer to do IR imaging of Earth, why not
<discord-> 𒀯​ 𒄷 𒄈𒀭𒁇. — AAAAAA (but for KSP porpoises, yeah)
<discord-> e​gg. — @Sir Mortimer I think @𒀯 𒄷 𒄈𒀭𒁇 has a point re. FoV though, that should be a property of imaging instruments (for Earth observations that defines the swath, which is a very important consideration for mission design)
<discord-> e​gg. — > AAAAAA
<discord-> e​gg. — I wonder what IRL considerations lead to that :-p
<discord-> 𒀯​ 𒄷 𒄈𒀭𒁇. — IRL means Infra Red Light now
<discord-> e​gg. — :D
<discord-> S​ir Mortimer. — hm.
<discord-> S​ir Mortimer. — so, with FOV, you wouldn't point a deep space telescope at earth from low orbit because then you're looking at areas the size of a football field?
<discord-> e​gg. — yeah
<discord-> S​ir Mortimer. — that would make a nice spy sat
<discord-> 𒀯​ 𒄷 𒄈𒀭𒁇. — yes to both
<discord-> e​gg. — but other than that, a thing that looks down and a thing that looks up are very much the same kind of animal
<discord-> e​gg. — which means that you avoid part-type spam
<discord-> e​gg. — https://en.wikipedia.org/wiki/Mars_Reconnaissance_Orbiter#HiRISE_(camera) is a telescope
<discord-> D​amien. — @Sir Mortimer hubble is basically a spy sat but pointed outwards iirc
<discord-> A​cer_Saccharum. — Hubble is basically a KH-11
<discord-> D​amien. — or the other way round
<discord-> D​amien. — yeah
<discord-> e​gg. — looks down
<discord-> 𒀯​ 𒄷 𒄈𒀭𒁇. — Yeah, and Roman is literally a reporpoised spy sat
<discord-> D​amien. — 🐬
<discord-> e​gg. — TIL WFIRST got a name
<discord-> 𒀯​ 𒄷 𒄈𒀭𒁇. — @egg Literally yesterday
<discord-> S​ir Mortimer. — hm.
<discord-> e​gg. — hahaha
<discord-> D​RVeyl. — Not sure there's much of a mechanic for brightness, to limit things with.
<discord-> D​RVeyl. — Stock-sized systems just wouldn't require telescopes as large, is all.
<discord-> e​gg. — yeah, not just because brightness but also wrt diffraction limit
<discord-> e​gg. — everything is smaller, balanc e by tweaking weight which is insane in stock anyway
<discord-> e​gg. — everything is smaller, balance by tweaking weight which is insane in stock anyway (edited)
<discord-> 𒀯​ 𒄷 𒄈𒀭𒁇. — Obviously Kerbals use glorified DSLRs
<discord-> S​ir Mortimer. — there is another thing. I can't really be picky with parts, because I don't know the first thing about how to make any, and won't even look into it. So I have to poach something from someone who has a thing that looks like a camera *and* has a license that allows me to use it. Which narrows it down quite drastically, because for some odd reason I don't understand those part makers are a speci
<discord-> e​gg. — platinum iridium mirrors everywhere
<discord-> 𒀯​ 𒄷 𒄈𒀭𒁇. — example telescope sizes: 0.1 m (probe), 0.3 m (large probe, small telescope), 0.9 m (Spitzerish), 2.7 m (better HST), 5.4 m (smol JWST)
<discord-> 𒀯​ 𒄷 𒄈𒀭𒁇. — Or just use a few actual ones
<discord-> e​gg. — @𒀯 𒄷 𒄈𒀭𒁇 would be interesting to look at some earth observation instruments to see how they fit in that classification
<discord-> e​gg. — @Sir Mortimer so that is an issue for stock-KC, rather than RO-KC where RO will slap KC scope configs on whatever scope parts RO reconfigures
<discord-> e​gg. — I presume
<discord-> D​RVeyl. — (Not that RO has scope parts either, I don't -think-)
<discord-> e​gg. — @DRVeyl well, not yet, because there was no need nor mechanism
<discord-> e​gg. — but RO’s thing is reconfiguring the parts of unsuspecting mods
<discord-> D​RVeyl. — V true.
<discord-> S​ir Mortimer. — ok. looking at it from a gamers perspective: size determines the resolution, FOV determines the mission types. can't do low orbit observation with low FOV, but need low FOV from low orbit for spy sats. also, low FOV for deep space observation (for which I don't have a contract yet)
<discord-> e​gg. — except surveys, where you want a large FoV
<discord-> e​gg. — but that sounds about right I think?
<discord-> e​gg. — @𒀯 𒄷 𒄈𒀭𒁇 is the telescope bird
<discord-> 𒀯​ 𒄷 𒄈𒀭𒁇. — Time-domain astronomy gets you high FoV for deep space (TESS, Fermi-LAT). Surveys tend towards larger FoVs, but those might be smaller than you'd think.
<discord-> D​RVeyl. — > but need low FOV from low orbit for spy sats
<discord-> D​RVeyl. — Better is to determine resolution on the body surface for this kind of thing, not angular resolution.,
<discord-> e​gg. — right, I was thinking of TESS as a survey
<discord-> e​gg. — it does say *Survey*, but it is admittedly an atypical one
<discord-> D​RVeyl. — (ie small telescope close, big telescope from far away)
<discord-> e​gg. — yeah, that is how the technical requirement should be implemented
<discord-> e​gg. — in practice, the reasonable solution is likely a normal spysat
<discord-> e​gg. — (but yes, if you have a Mun base and massive telescopes there, that should be an option :D)
<discord-> D​amien. — @Sir Mortimer researchbodies has a telescope model and the artwork and graphics are CC-BY-NC-SA 4.0
<discord-> D​amien. — not sure if that's any use
<discord-> D​amien. — tarsier space tech too but they don't have the licence listed
<discord-> D​amien. — dev says message him
<discord-> D​amien. — <https://forum.kerbalspaceprogram.com/index.php?/topic/154853-19x-tarsier-space-technology-with-galaxies-v710-29th-feb-2020/>
<discord-> e​gg. — > <@𒀯 𒄷 𒄈𒀭𒁇> example telescope sizes: 0.1 m (probe), 0.3 m (large probe, small telescope), 0.9 m (Spitzerish), 2.7 m (better HST), 5.4 m (smol JWST)
<discord-> e​gg. — > <egg> would be interesting to look at some earth observation instruments to see how they fit in that classification
<discord-> e​gg. — so Sentinel-2 MSI has 150 mm aperture, 600 mm focal length, FoV 21° by 3.5° (I don’t think we want to get into FoV shape and pushbroom considerations)
<discord-> e​gg. — so that is 21°
<discord-> e​gg. — probeish on the @𒀯 𒄷 𒄈𒀭𒁇 classification
<discord-> D​RVeyl. — So... what are the contracts? If we assume we can build a few [or many] telescope parts and we can dial their angular resolution and FOV independently (is this fair, or the limits reasonably easy to bound?), what are you asking them to do?
<discord-> D​RVeyl. —
<discord-> D​RVeyl. — "Map Moho to 10m surface resultion."
<discord-> D​RVeyl. — "Map Eve to 1m surface resolution."
<discord-> D​RVeyl. — "Observe any point in the northern hemisphere with 10m accuracy every 24 hours" ?
<discord-> 𒀯​ 𒄷 𒄈𒀭𒁇. — Also, I messed up. Was just doing 3x, but last jump was 2x
<discord-> D​amien. — <https://forum.kerbalspaceprogram.com/index.php?/topic/145633-18x-hullcam-vds-continued/>
<discord-> D​amien. — is GPLv3
<discord-> D​RVeyl. — (Non-circular FoV tends to get annoying only because there isn't a sane representation of part orientation in KSP. Is a reason I avoided the idea in RealAntennas, as example.)
<discord-> D​RVeyl. — (Non-circular FoV tends to get annoying only because there isn't a sane tracking of part orientation in KSP. Is a reason I avoided the idea in RealAntennas, as example.) (edited)
<discord-> D​RVeyl. — (Non-circular FoV tends to get annoying only because there isn't a sane tracking or control of part orientation in KSP. Is a reason I avoided the idea in RealAntennas, as example.) (edited)
<discord-> D​RVeyl. — (Non-circular FoV tends to get annoying because there isn't a sane tracking or control of part orientation in KSP. Is a reason I avoided the idea in RealAntennas, as example.) (edited)
<discord-> e​gg. — @DRVeyl yeah, or "image 40 % of the Earth’s surface at once, in full illumination, at a 25 km resolution, every day for a year"
<discord-> e​gg. — which is a contract fulfillable by DSCOVR or a GEO sat (or probably by a giant space telescope orbiting Venus and another one on Mercury)
<discord-> e​gg. — or if you want to go from the original blue marble vibe of DSCOVR, you could say once a month, and then a telescope on the moon would do the job as well
<discord-> D​RVeyl. — Does ScanSat provide any tools to make any of this easier, or harder, or worth integrating to?
<discord-> 𒀯​ 𒄷 𒄈𒀭𒁇. — @DRVeyl Giving a player a few fixed telescope sizes, and letting them do FoV/resolution tradeoffs (modulo wavelength/diffraction) in them is as best I'm aware fair
<discord-> e​gg. — added a paragraph summarizing this general idea in the rationale https://github.com/Kerbalism/KerbalismContracts/wiki/Design#rationale
<discord-> e​gg. — will add things about imaging instruments, their properties, the diffraction limit, etc., later
<discord-> e​gg. — @𒀯 𒄷 𒄈𒀭𒁇
<discord-> e​gg. — > FoV/resolution tradeoffs
<discord-> e​gg. — what do you mean?
<discord-> S​ir Mortimer. — @DRVeyl scansat won’t help
<discord-> S​ir Mortimer. — Unless...
<discord-> S​ir Mortimer. — *disappears into a rabbit hole*
<discord-> D​RVeyl. — Might just be a later thing to show the state of the maps you're making.
<discord-> D​RVeyl. — You are, essentially, making maps 😉
<discord-> S​ir Mortimer. — But a hard dependency on scansat?
<discord-> D​RVeyl. — (That occasionally wipe old data.)
<discord-> e​gg. — yeah the thing is you need maps with a sense of freshness
<discord-> e​gg. — e.g. some earth observation contracts should care a lot about freshness
<discord-> D​RVeyl. — I haven't looked at any of the implementation at ScanSat. I do see that DMagic has very recent commits. No clue where he's going with it.
<discord-> D​RVeyl. — Entirely possible -- maybe even likely -- it doesn't give you enough to make a requirement. Maybe makes for some interesting interoperability later.
<discord-> D​RVeyl. — Entirely possible -- likely really -- it doesn't give you enough to make a requirement. Maybe makes for some interesting interoperability later. (edited)
<discord-> e​gg. — yeah I think ignoring it for now may be the least rabbitholey course of action
<discord-> D​RVeyl. — Not sure how you're implementing the tracking for how much of the surface you currently see. Or if there's any useful techniques in there for representing the body surfaces. (In a sense you're doing something very similar... I don't know if ScanSat has eg a fixed resolution or not...)
<discord-> D​RVeyl. — But agree, avoid rabbitholes for now. 🙂
* discord- e​gg. — points at the /topic_
<discord-> S​ir Mortimer. — @DRVeyl dacansat uses an array of integers to track mapped areas of bodies. Each bit represents one map type. Resolution is limited, as is the interoperability capability of the plugin. Plus, I’d rather keep it simpler for now
<discord-> S​ir Mortimer. — @DRVeyl scansat uses an array of integers to track mapped areas of bodies. Each bit represents one map type. Resolution is limited, as is the interoperability capability of the plugin. Plus, I’d rather keep it simpler for now (edited)
<discord-> D​RVeyl. — The limited resolution is probably your biggest pain. Ok.
<discord-> S​ir Mortimer. — So, look at target for X amount of time has to be enough for now
<discord-> D​RVeyl. — The limited [fixed] resolution is probably your biggest pain. Ok. (edited)
<discord-> D​RVeyl. — (Impatiently waits for Kerbalism Contracts + Principia to craft a separate flexible Mapping Tool spinoff...)
<discord-> D​RVeyl. — _Impatiently waits for Kerbalism Contracts + Principia to craft a separate flexible Mapping Tool spinoff..._ (edited)
<_whitenotifier-d13c> [Principia] pleroy opened pull request #2588: Add support for transmitting the status's message to the C# code - https://git.io/Jf2eq
<_whitenotifier-d13c> [Principia] Pending. Build queued… - 
<_whitenotifier-d13c> [Principia] Pending. Building… - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/4305/
<discord-> 𒀯​ 𒄷 𒄈𒀭𒁇. — @egg I'd need to double check on some spacecraft, but I want to say that eg: TESS' giant pixels are rather larger than they could have if they weren't doing that all sky thing. If we're considering wavelengths, if you're diffraction limited in NIR, you're leaving some resolution (or FoV) on the table in NUV. Also I think there's something going on with tradeoffs in some x-ray/gamma
<_whitenotifier-d13c> [Principia] Failure. Build finished. - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/4305/
<discord-> 𒀯​ 𒄷 𒄈𒀭𒁇. — Hrm, looks like TESS was able to through enough pixels that they're diffraction limited*
<discord-> 𒀯​ 𒄷 𒄈𒀭𒁇. — *They do slightly unfocused images for reasons of photometric precision
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<discord-> e​gg. — photometry is strange
<_whitenotifier-d13c> [Principia] pleroy pushed 1 commit to master [+0/-0/±1] https://git.io/Jf2IP
<_whitenotifier-d13c> [Principia] pleroy f7e491f - Announce Fuchs.
<UmbralRaptop> okay, but consider speggtroscopy for precise radial velocities
<UmbralRaptop> Including heated gas cells with some Fun gases
<UmbralRaptop> Currently popular: iodine. At one time in the 80s: hydrogen fluoride
<egg|laptop|egg> UmbralRaptop: can you update the IRC /topic?
<egg|laptop|egg> (the current version has not been Fréchet for a while, but now it is Fuchs)
UmbralRaptop changed the topic of #principia to: READ THE FAQ: http://goo.gl/gMZF9H; The current version is Fréchet. We currently target 1.5.1, 1.6.1, and 1.7.x. <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
<UmbralRaptop> TODO: which versions of KSP are currently targeted?
<egg|laptop|egg> 1.5.1 through 1.9.1, excluding some short-lived versions
<egg|laptop|egg> 1.5.1, 1.6.1, 1.7.x, 1.8.1, 1.9.1 I think
<egg|laptop|egg> with separate builds for pre and post 1.8
<egg|laptop|egg> Galileo will drop pre-1.8
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
<_whitenotifier-d13c> [Principia] pleroy synchronize pull request #2588: Add support for transmitting the status's message to the C# code - https://git.io/Jf2eq
<_whitenotifier-d13c> [Principia] Pending. Build queued… - 
<_whitenotifier-d13c> [Principia] Pending. Building… - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/4306/
<_whitenotifier-d13c> [Principia] Failure. Build finished. - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/4306/
<_whitenotifier-d13c> [Principia] pleroy synchronize pull request #2588: Add support for transmitting the status's message to the C# code - https://git.io/Jf2eq
<_whitenotifier-d13c> [Principia] Pending. Build queued… - 
<_whitenotifier-d13c> [Principia] Pending. Building… - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/4307/
<_whitenotifier-d13c> [Principia] Failure. Build finished. - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/4307/
<discord-> B​utcher. — Oh new moon tomorrow. 🎉
<discord-> e​gg. — 🌑 indeed
<UmbralRaptop> 🌚
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